Page 1 ® ® 89HPES34H16G2 ® PCI Express Switch User Manual April 2013 6024 Silver Creek Valley Road, San Jose, California 95138 Telephone: (800) 345-7015 • (408) 284-8200 • FAX: (408) 284-2775 Printed in U.S.A. ©2013 Integrated Device Technology, Inc.
Page 2 GENERAL DISCLAIMER Integrated Device Technology, Inc. reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. IDT does not assume any responsibility for use of any circuitry described other than the circuitry embodied in an IDT product. The Company makes no representations that circuitry described herein is free from patent infringement or other rights of third parties which may result from its use.
Page 3: About This Manual
About This Manual ® Introduction Notes This user manual includes hardware and software information on the 89HPES34H16G2, a member of IDT’s PRECISE™ family of PCI Express® switching solutions offering the next-generation I/O interconnect standard. Finding Additional Information Information not included in this manual such as mechanicals, package pin-outs, and electrical character- istics can be found in the data sheet for this device, which is available from the IDT website (www.idt.com) as well as through your local IDT sales representative.
Page 4: Signal Nomenclature
Notes Chapter 17, “Switch Control and Status Registers,” lists the switch control and status registers in the PES34H16G2 and provides a description of each bit in those registers. Chapter 18, “JTAG Boundary Scan,” discusses an enhanced JTAG interface, including a system logic TAP controller, signal definitions, a test data register, an instruction register, and usage considerations.
Page 5: Register Terminology
Notes Term Words Bytes Bits Byte Word Doubleword (Dword) Quadword (Qword) Table 1 Data Unit Terminology In quadwords, bit 63 is always the most significant bit and bit 0 is the least significant bit. In double- words, bit 31 is always the most significant bit and bit 0 is the least significant bit. In words, bit 15 is always the most significant bit and bit 0 is the least significant bit.
Page 6 Notes Type Abbreviation Description Hardware Initialized HWINIT Register bits are initialized by firmware or hardware mechanisms such as pin strapping or serial EEPROM. (System firmware hard- ware initialization is only allowed for system integrated devices.) Bits are read-only after initialization and can only be reset (for write-once by firmware) with reset.
Page 7: Use Of Hypertext
Use of Hypertext Notes In Chapter 15, Tables 15.4, 15.5 and 15.6 contain register names and page numbers highlighted in blue under the Register Definition column. In pdf files, users can jump from this source table directly to the regis- ters by clicking on the register name in the source table.
Page 8 Notes June 16, 2009: In Chapter 5, revised Table 5.1 and revised text in sections Partition Hot Reset and Port Mode Change Reset. In Chapter 6, revised text in the following sections: Partition State, Partition State Change via Other Methods, Port Operating Mode Change via EEPROM Loading, Port Operating Mode Change via Other Methods, and Dynamic Reconfiguration.
Page 9 Notes SWPORT[x]CTL registers, added PFAILOVER and SFAILOVER fields to SWPART[X]STS register and SWPORT[x]STS register, adjusted bit fields in GPIOCFG1 and GPIOD1 registers, and added SSMBMODE field to the SMBUSCTL register. August 31, 2011: In Chapter 2, page 2-1, added bullet to explain behavior of an odd numbered port when it is merged with its even counterpart.
Page 10 Notes PES34H16G2 User Manual April 5, 2013...
Page 11: Table Of Contents
Table of Contents ® About This Manual Notes Introduction ............................ 1 Content Summary .......................... 1 Signal Nomenclature ........................2 Numeric Representations ......................2 Data Units ............................2 Register Terminology ........................3 Use of Hypertext ..........................5 Reference Documents ........................5 Revision History ..........................
Page 12 IDT Table of Contents Notes End-to-End Data Path Parity Protection ................3-14 Clocking Introduction ............................. 4-1 Port Clocking Mode ........................4-1 Reset and Initialization Introduction ............................. 5-1 Boot Configuration Vector....................... 5-2 Switch Fundamental Reset......................5-3 Switch Mode Dependent Initialization..................5-6 Port Merging ...........................
Page 13 IDT Table of Contents Notes L0s ASPM..........................7-12 L1 ASPM ..........................7-12 L1 ASPM Entry Rejection Timer ....................7-13 Link Status ............................ 7-14 De-emphasis Negotiation ......................7-14 Crosslink ............................7-15 Hot Reset Operation on a Crosslink ..................7-16 Link Disable Operation on a Crosslink ................. 7-16 Gen1 Compatibility Mode ......................
Page 14 IDT Table of Contents Power Management Notes Introduction ........................... 11-1 PME Messages..........................11-3 PCI Express Power Management Fence Protocol ............... 11-3 Upstream Switch Port or Downstream Switch Port Mode ............ 11-3 Power Budgeting Capability......................11-4 General Purpose I/O Introduction ........................... 12-1 GPIO Configuration ........................
Page 15 IDT Table of Contents PCI to PCI Bridge and Proprietary Port Specific Registers Notes Type 1 Configuration Header Registers ..................16-1 PCI Express Capability Structure ....................16-11 Power Management Capability Structure ................... 16-27 Message Signaled Interrupt Capability Structure ............... 16-29 Subsystem ID and Subsystem Vendor ID ..................
Page 16 IDT Table of Contents Notes PES34H16G2 User Manual April 5, 2013...
Page 17 List of Tables ® Table 1.1 Initial Configuration Register Settings for PES34H16G2............. 1-4 Notes Table 1.2 PES34H16G2 Device IDs....................1-6 Table 1.3 PES34H16G2 Revision ID....................1-6 Table 1.4 PCI Express Interface Pins....................1-7 Table 1.5 Reference Clock Pins ......................1-8 Table 1.6 SMBus Interface Pins ......................
Page 18 IDT List of Tables Notes Table 12.2 General Purpose I/O Pin Alternate Function ..............12-2 Table 12.3 GPIO Alternate Function Pins ................... 12-3 Table 13.1 Serial EEPROM SMBus Address ..................13-2 Table 13.2 PES34H16G2 Compatible Serial EEPROMs ..............13-2 Table 13.3 Serial EEPROM Initialization Errors ..................
Page 19 List of Figures ® Figure 1.1 PES34H16G2 Block Diagram ....................1-4 Notes Figure 1.2 PES34H16G2 Logic Diagram ....................1-5 Figure 2.1 PES34H16G2 Block Diagram ....................2-1 Figure 2.2 Transparent PCIe Switch ....................2-2 Figure 2.3 Partitionable PCI Express Switch ..................2-2 Figure 3.1 Crossbar Connection to Port Ingress and Egress Buffers ..........3-3 Figure 3.2 Architectural Model of Arbitration ..................3-6 Figure 3.3...
Page 20 IDT List of Figures Notes Figure 13.7 Serial EEPROM Read or Write CMD Field Format ............13-18 Figure 13.8 CSR Register Read Using SMBus Block Write/Read Transactions with PEC Disabled 13-19 Figure 13.9 Serial EEPROM Read Using SMBus Block Write/Read Transactions with PEC Disabled .........................13-19 Figure 13.10 CSR Register Write Using SMBus Block Write Transactions with PEC Disabled ..13-19 Figure 13.11 Serial EEPROM Write Using SMBus Block Write Transactions with PEC Disabled ..13-20...
Page 21 Register List ® ACSCAP - ACS Capability Register (0x324)..................16-49 Notes ACSCTL - ACS Control Register (0x326)..................... 16-51 ACSECAPH - ACS Extended Capability Header (0x320) ..............16-49 ACSECV - ACS Egress Control Vector (0x328)................... 16-52 AERCAP - AER Capabilities (0x100) ....................16-32 AERCEM - AER Correctable Error Mask (0x114) ................
Page 22 IDT Register List Notes INTRLINE - Interrupt Line Register (0x03C) ...................16-9 INTRPIN - Interrupt PIN Register (0x03D) ....................16-9 IOBASE - I/O Base Register (0x01C)......................16-5 IOBASEU - I/O Base Upper Register (0x030)..................16-8 IOEXPADDR0 - SMBus I/O Expander Address 0 (0x0AD8)..............17-24 IOEXPADDR1 - SMBus I/O Expander Address 1 (0x0ADC) ..............17-25 IOEXPADDR2 - SMBus I/O Expander Address 2 (0x0AE0) ..............17-25 IOEXPADDR3 - SMBus I/O Expander Address 3 (0x0AE4) ..............17-25 IOLIMIT - I/O Limit Register (0x01D).......................16-6...
Page 23 IDT Register List Notes PCISTS - PCI Status Register (0x006) ....................16-2 PHYLCFG0 - Phy Link Configuration 0 (0x530)..................16-67 PHYLSTATE0 - Phy Link State 0 (0x540).....................16-68 PHYPRBS - Phy PRBS Seed (0x55C)....................16-68 PLTIMER - Primary Latency Timer (0x00D)....................16-4 PMBASE - Prefetchable Memory Base Register (0x024) ...............16-7 PMBASEU - Prefetchable Memory Base Upper Register (0x028)............16-8 PMCAP - PCI Power Management Capabilities (0x0C0)..............16-27 PMCSR - PCI Power Management Control and Status (0x0C4) ............16-28...
Page 24 IDT Register List Notes PES34H16G2 User Manual April 5, 2013...
Page 25: Pes34H16G2 Device Overview
Chapter 1 PES34H16G2 Device Overview ® Introduction Notes The 89HPES34H16G2 is a member of the IDT PRECISE™ family of PCI Express® switching solutions. The PES34H16G2 is a 34-lane, 16-port peripheral chip that performs PCI Express packet switching with a feature set optimized for high-performance applications such as servers, storage, and communications/ networking.
Page 26 IDT PES34H16G2 Device Overview Notes – Per lane SerDes configuration • De-emphasis • Receive equalization • Drive strength Switch Partitioning  – IDT proprietary feature that creates logically independent switches in the device – Supports up to 16 fully independent switch partitions –...
Page 27 IDT PES34H16G2 Device Overview Notes • SerDes optionally turned-off in D3hot • SerDes associated with unused ports are turned-off • SerDes associated with unused lanes are placed in a low power state 32 General Purpose I/O   Reliability, Availability and Serviceability (RAS) –...
Page 28: Figure 2.1 Pes34H16G2 Block Diagram
IDT PES34H16G2 Device Overview x8/x4/x2/x1 x8/x4/x2/x1 x8/x4/x2/x1 SerDes SerDes SerDes DL/Transaction Layer DL/Transaction Layer DL/Transaction Layer Port Route Table Arbitration 16-Port Switch Core Scheduler Frame Buffer DL/Transaction Layer DL/Transaction Layer SerDes (10) SerDes ..34 PCI Express Lanes Up to 6 x4 ports and 10 x1 Ports Figure 1.1 PES34H16G2 Block Diagram PCIELCAP...
Page 29: Logic Diagram
IDT PES34H16G2 Device Overview Logic Diagram GCLKN[1:0] Global GCLKP[1:0] Reference Clocks GCLKFSEL PE00RP[0] PE00TP[0] PCIe Switch PCIe Switch PE00RN[0] PE00TN[0] SerDes Input SerDes Output Port 0 Port 0 PE00RP[3] PE00TP[3] PE00RN[3] PE00TN[3] PE01TP[0] PE01RP[0] PCIe Switch PCIe Switch PE01RN[0] PE01TN[0] SerDes Input SerDes Output Port 1...
Page 30: System Identification
IDT PES34H16G2 Device Overview System Identification Notes Vendor ID All vendor IDs in the device are hardwired to 0x111D which corresponds to Integrated Device Tech- nology, Inc. Device ID The PES34H16G2 device ID is shown in Table 1.2. PCIe Device Device ID 0x04 0x8074...
Page 31: Pin Description
IDT PES34H16G2 Device Overview Pin Description Notes The following tables list the functions of the pins provided on the PES34H16G2. Some of the functions listed may be multiplexed onto the same pin. The active polarity of a signal is defined using a suffix. Signals ending with an “N”...
Page 32: Table 1.5 Reference Clock Pins
IDT PES34H16G2 Device Overview Notes Signal Type Name/Description PE08RN[0] PCI Express Port 8 Serial Data Receive. Differential PCI Express receive PE08RP[0] pair for port 8. PE08TN[0] PCI Express Port 8 Serial Data Transmit. Differential PCI Express trans- PE08TP[0] mit pair for port 8. PE09RN[0] PCI Express Port 9 Serial Data Receive.
Page 33: Table 1.6 Smbus Interface Pins
IDT PES34H16G2 Device Overview Notes Signal Type Name/Description MSMBADDR[4:1] Master SMBus Address. These pins determine the SMBus address of the serial EEPROM from which configuration information is loaded. MSMBCLK Master SMBus Clock. This bidirectional signal is used to synchronize transfers on the master SMBus. It is active and generating the clock only when the EEPROM or I/O Expanders are being accessed.
Page 34 IDT PES34H16G2 Device Overview Notes Signal Type Name/Description GPIO[8] General Purpose I/O. This pin can be configured as a general purpose I/O pin. Alternate function pin name: P3RSTN Alternate function pin type: Output Alternate function: Reset output for downstream port 3 GPIO[9] General Purpose I/O.
Page 35 IDT PES34H16G2 Device Overview Notes Signal Type Name/Description GPIO[18] General Purpose I/O. This pin can be configured as a general purpose I/O pin. Alternate function pin name: P13RSTN Alternate function pin type: Output Alternate function: Reset output for downstream port 13 GPIO[19] General Purpose I/O.
Page 36: Table 1.8 System Pins
IDT PES34H16G2 Device Overview Notes Signal Type Name/Description GPIO[28] General Purpose I/O. This pin can be configured as a general purpose I/O pin. Alternate function pin name: IOEXPINTN7 Alternate function pin type: Input Alternate function: SMBus I/O expander interrupt 7 GPIO[29] General Purpose I/O.
Page 37: Table 1.9 Test Pins
IDT PES34H16G2 Device Overview Notes Signal Type Name/Description PERSTN Fundamental Reset. Assertion of this signal resets all logic inside the PES34H16G2 and initiates a PCI Express fundamental reset. RSTHALT Reset Halt. When this signal is asserted during a PCI Express fundamental reset, the PES34H16G2 executes the reset procedure and remains in a reset state with the Master and Slave SMBuses active.
Page 38: Table 1.10 Power, Ground, And Serdes Resistor Pins
IDT PES34H16G2 Device Overview Notes Signal Type Name/Description REFRES00 Port 0 External Reference Resistor. Provides a reference for the Port 0 SerDes bias currents and PLL calibration circuitry. A 3 kOhm +/- 1% resis- tor should be connected from this pin to ground. REFRES01 Port 1 External Reference Resistor.
Page 39 IDT PES34H16G2 Device Overview Notes Signal Type Name/Description REFRES15 Port 15 External Reference Resistor. Provides a reference for the Port 15 SerDes bias currents and PLL calibration circuitry. A 3 kOhm +/- 1% resis- tor should be connected from this pin to ground. REFRESPLL PLL External Reference Resistor.
Page 40: Pin Characteristics
IDT PES34H16G2 Device Overview Pin Characteristics Notes Note: Some input pads of the switch do not contain internal pull-ups or pull-downs. Unused SMBus and System inputs should be tied off to appropriate levels. This is especially critical for unused control signal inputs which, if left floating, could adversely affect operation.
Page 41 IDT PES34H16G2 Device Overview Notes Internal Function Pin Name Type Buffer Notes Type Resistor PCI Express PE08RP[0] PCIe Serial Link Interface (cont.) differential PE08TN[0] PE08TP[0] PE09RN[0] PE09RP[0] PE09TN[0] PE09TP[0] PE10RN[0] PE10RP[0] PE10TN[0] PE10TP[0] PE11RN[0] PE11RP[0] PE11TN[0] PE11TP[0] PE12RN[0] PE12RP[0] PE12TN[0] PE12TP[0] PE13RN[0] PE13RP[0]...
Page 42 IDT PES34H16G2 Device Overview Notes Internal Function Pin Name Type Buffer Notes Type Resistor SMBus MSMBADDR[4:1] LVTTL pull-down MSMBCLK MSMBDAT SSMBADDR[5,3:1] pull-up SSMBCLK SSMBDAT General Purpose GPIO[31:0] LVTTL pull-up System Pins CLKMODE[1:0] LVTTL Input pull-up GCLKFSEL pull-down MSMBSMODE pull-down P01MERGEN pull-down P23MERGEN pull-down...
Page 43 IDT PES34H16G2 Device Overview Notes Internal Function Pin Name Type Buffer Notes Type Resistor SerDes Reference REFRES14 Analog Resistors (Cont.) REFRES15 REFRESPLL Table 1.11 Pin Characteristics (Part 4 of 4) Internal resistor values under typical operating conditions are 92K  for pull-up and 91K for pull-down. All receiver pins set the DC common mode voltage to ground.
Page 44 IDT PES34H16G2 Device Overview Notes PES34H16G2 User Manual 1 - 20 April 5, 2013...
Page 45: Architectural Overview
Chapter 2 Architectural Overview ® Introduction Notes This section provides a high level architectural overview of the PES34H16G2. An architectural block diagram of the PES34H16G2 is shown in Figure 2.1. PCI Express Port s PCI Express Port s SerDes SerDes SerDes SerDes SerDes...
Page 46: Switch Partitioning
IDT Architectural Overview Switch Partitioning Notes The logical view of a PCIe switch is shown in Figure 2.2. A PCI switch contains one upstream port and one or more downstream ports. Each port is associated with a PCI-to-PCI bridge. All PCI-to-PCI bridges associated with a PCIe switch are interconnected by a virtual PCI bus.
Page 47: Dynamic Reconfiguration
IDT Architectural Overview Notes Each partition operates logically as a completely independent PCIe switch that implements the behavior and capabilities outlined in the PCI Express Base specification required of a switch. The PES34H16G2 supports boot-time (i.e., Fundamental Reset) and runtime configuration of ports into partitions.
Page 48 IDT Architectural Overview Notes PES34H16G2 User Manual 2 - 4 April 5, 2013...
Page 49: Switch Core
Chapter 3 Switch Core ® Introduction Notes This chapter provides an overview of the PES34H16G2’s Switch Core. As shown in Figure 2.1 in the Architectural Overview chapter, the Switch Core interconnects switch ports. The Switch Core’s main func- tion is to transfer TLPs among these ports efficiently and reliably. In order to do so, the Switch Core provides buffering, ordering, arbitration, and error detection services.
Page 50: Egress Buffer
IDT Switch Core Notes Total Size and Advertised Advertised Port Limitations Data Header Mode Queue (per-port) Credits Credits Posted 12352 Bytes and up to 127 Merged TLPs Non Posted 2048 Bytes and up to 127 TLPs Completion 12352 Bytes and up to 127 TLPs Table 3.1 IFB Buffer Sizes (Part 2 of 2) Egress Buffer...
Page 51: Crossbar Interconnect
IDT Switch Core Notes Port Replay Buffer Storage Mode Limit 32 TLPs Bifurcated 64 TLPs Merged Table 3.3 Replay Buffer Storage Limit Crossbar Interconnect The crossbar is a 16x16 matrix of pathways, capable of concurrently transferring data between a maximum of 16 port pairs. The crossbar interconnects the port ingress buffers to the egress buffers. It provides two data-interfaces per port, one for the port’s ingress buffers and one for the port’s egress buffers.
Page 52: Packet Ordering
IDT Switch Core Notes in the appropriate IFB queue. After being queued in an IFB and undergoing ordering and arbitration, all data transferred through the crossbar interconnect is transferred in a continuous TLP manner (i.e., the data path is never multiplexed). This choice of datapath width implies that the crossbar has 20% higher throughput than the throughput required to service all ports.
Page 53: Arbitration
IDT Switch Core Notes Posted Non-Posted Request Completion Request IO or IO or Memory Configur Row Pass Column? Configur Read Write or Read ation ation Comple- Message Request Write Write tion Request Comple- Request tion Posted Memory Request Write or Message Request Non Posted...
Page 54: Port Arbitration
IDT Switch Core Notes Switch Core Port 0 IFB VC 0 Port 0 Egress Arbitration VC 0 Arbitration Port VC 0 Port 1 IFB (not Arbitration applicable) VC 0 Port 15 Egress Arbitration VC 0 Arbitration Port VC 0 (not Arbitration applicable) Port 15 IFB...
Page 55: Table 3.5 Conditions For Cut-Through Transfers
IDT Switch Core Notes and egress link bandwidth is determined by the negotiated speed and width of the links. Table 3.5 shows the conditions under which cut-through and adaptive-cut-through occur. When the conditions are met, cut- through is performed across the IFB, crossbar , and EFB.
Page 56: Request Metering
IDT Switch Core Notes Ingress Ingress Egress Egress Conditions for Cut- Link Link Link Link Through Speed Width Speed Width 5.0 Gbps x8, x4, x2, x1 Always x8, x4, x2, x1 Always x8, x4, x2, x1 Always At least 50% of packet is in IFB x4, x2, x1 Always At least 50% of packet is in IFB...
Page 57: Figure 3.3 Pcie Switch Static Rate Mismatch
IDT Switch Core Notes If read requests are injected sporadically or at a low rate, then buffering within the switch may be used to accommodate short lived contention and allow completions to endpoints to proceed without interfering. If read requests are injected at a high rate, then no amount of buffering in the switch will prevent completions from interfering.
Page 58: Operation
IDT Switch Core Notes The request metering implementation in the PES34H16G2 makes a number of simplifying assumptions that may or may not be true in all systems. Therefore, it should be expected that some amount of parameter tuning may be required to achieve optimum performance. Note that tuning of the request metering mechanism should take into account the completion timeout value of the associated requesters (i.e., request metering should be tuned such that a requester’s comple- tion timeout value is not violated).
Page 59: Table 3.6 Request Metering Decrement Value
IDT Switch Core Notes The Decrement Value Adjustment (DVADJ) field represents a sign-magnitude fixed point 0:4:11 number (i.e., a positive fixed-point number with 4 integer bits and 11 fractional bits). – DVADJ field provides fine grain programmable adjustment of the value by which the counter is decremented.
Page 60: Completion Size Estimation
IDT Switch Core Notes tmp = RequestMeteringCounter RequestMeteringCounter (DecrementValue[LinkSpeed,LinkWidth] RMCTL.DVADJ) if (tmp < RequestMeteringCounter) { RequestMeteringCounter = 0 Figure 3.7 Request Metering Counter Decrement Operation Completion Size Estimation This section describes the value that is loaded into the request metering counter when a request is transferred into the switch core.
Page 61: Internal Errors
IDT Switch Core Notes If the number of data DWords is zero, then the completion size is estimated to be three DWords (i.e., a 0:13:3 representation value of 0x0018). – Otherwise, if the number of required data DWords is less than the Constant Limit (CNSTLIMIT) field in the RMCTL register, then the completion size is estimated as the number of required data DWords plus one.
Page 62: Switch Time-Outs
IDT Switch Core Notes To facilitate testing of software error handlers, any bit in the IERRORSTS register may be set by writing a one to the corresponding bit position in the Internal Error Test (IERRORTST) register. Once a bit is set in the ERRORSTS register, it is processed as though the actual error occurred (e.g., reported by AER).
Page 63 IDT Switch Core Notes As the TLP flows through the switch, its alignment or contents may be modified. In all such cases, parity is updated and not recomputed. Hence, any error that occurs is propagated and not masked by a parity regeneration.
Page 64 IDT Switch Core Notes PES34H16G2 User Manual 3 - 16 April 5, 2013...
Page 65: Clocking
Chapter 4 Clocking ® Introduction Notes Figure 4.1 provides a logical representation of the PES34H16G2 clocking architecture. The PES34H16G2 has a single differential global reference clock input (GCLK). Port 0 Port 1 Port 2 Port 3 Port 14 Port 15 SerDes SerDes SerDes...
Page 66: Table 4.1 Initial Port Clocking Mode And Slot Clock Configuration State
IDT Clocking Notes advertisement of whether or not the port uses the same reference clock source as the link partner. A one in the SCLK field indicates that the port and its link partner use the same reference clock source. This is defined as Common Clock Configuration by the PCI Express Base Specification.
Page 67: Reset And Initialization
Chapter 5 Reset and Initialization ® Introduction Notes This chapter describes the PES34H16G2 resets and initialization. There are two classes of PES34H16G2 resets. The first is a switch fundamental reset which is the reset used to initialize the entire device. The second class is referred to as partition resets. This class has multiple sub-categories. Partition resets are associated with a specific PES34H16G2 switch partition and corresponds to those resets defined in the PCI express base specification.
Page 68: Boot Configuration Vector
IDT Reset and Initialization Notes Registers and fields designated as Sticky (Sticky) take on their initial value as a result of the following resets. Other resets have no effect on registers and fields with this designation. – Switch Fundamental Reset –...
Page 69: Switch Fundamental Reset
IDT Reset and Initialization Notes May Be Signal Name/Description Overridden RSTHALT Reset Halt. When this pin is asserted during a switch fundamental reset sequence, the PES34H16G2 remains in a reset state with the Master and Slave SMBuses active. This allows software to read and write registers internal to the device before normal device operation begins.
Page 70 IDT Reset and Initialization Notes 10. If the sampled Switch Mode (SWMODE[3:0]) state corresponds to a mode that supports serial EEPROM initialization, then the contents of the serial EEPROM are read and appropriate switch registers are updated. – While the contents of the EEPROM are read, the switch responds to all configuration request with configuration-request-retry-status completion.
Page 71: Figure 5.1 Switch Fundamental Reset With Serial Eeprom Initialization
IDT Reset and Initialization Notes The operation of a switch fundamental reset with serial EEPROM initialization is illustrated in Figure 5.1. Stable Stable Power GCLK GCLK* > 100ns PERSTN < 100 ms ~285 s ~2 s PLL Reset & Lock Link Ready SerDes CDR Lock...
Page 72: Switch Mode Dependent Initialization
IDT Reset and Initialization Switch Mode Dependent Initialization Notes Switch modes may be subdivided into normal switch modes and test modes. The modes listed below are normal switch modes. All other switch modes are test modes. – Single partition – Single partition with Serial EEPROM initialization –...
Page 73: Port Merging
IDT Reset and Initialization Notes Single Partition with Port 0 Upstream Port (Port 2 disabled) In single partition with port 0 upstream port, the initial values outlined in Table 5.3 result in the following configuration. – All switch ports, except port 2, are members of partition zero. –...
Page 74: Partition Resets
IDT Reset and Initialization Notes – All registers associated with the port remain accessible from the global address space. – The port remains in this state regardless of the setting of the port’s operating mode (i.e., via the port’s SWPORTxCTL register). An active port behaves as described throughout the rest of this specification and may be configured in one of several operating modes, as described in Chapter 6 , Switch Partitions.
Page 75: Partition Hot Reset
IDT Reset and Initialization Partition Hot Reset Notes A partition hot reset is initiated by any of the following events: – Reception of TS1 ordered-sets on the partition’s upstream port indicating a hot reset. – Data link layer of the partition’s upstream port transitions to the DL_Down state. –...
Page 76: Partition Downstream Secondary Bus Reset
IDT Reset and Initialization Notes • If the link associated with a downstream port is in the Disabled LTSSM state, then a hot reset will not be propagated out on that port. The port will instead transition to the Detect LTSSM state. Although not a hot reset, this has the same functional effect on downstream components.
Page 77: Switch Partitions
Chapter 6 Switch Partitions ® Introduction Notes The PES34H16G2 supports up to 16 active switch partitions. Each switch partition represents an inde- pendent PCI Express hierarchy whose operation is independent of other switch partitions. A port may be configured to operate in one of four modes. –...
Page 78: Partition State
IDT Switch Partitions Notes A partition with one upstream port and no downstream ports has the following behavior. – All received requests, except configuration requests that target the upstream port, are treated as unsupported requests. – All received completions are treated as unsupported requests. –...
Page 79: Partition State Change
IDT Switch Partitions Notes The partition fundamental reset condition is considered to persist as long as the STATE field in the SWPARTxCTL register remains in the fundamental reset state. Transitioning a partition from the funda- mental reset state to the active state requires that the system meet the requirements associated with a conventional reset outlined in Section 6.6.1 in the PCIe Base specification.
Page 80: Switch Ports
IDT Switch Partitions Notes Refer to section Static Reconfiguration on page 6-15 for a sample partition and port configuration sequence programmed via the serial EEPROM. Partition State Change via Other Methods When modifying the state of a partition via methods other than EEPROM loading (i.e., via PCI Express configuration requests or using the SMBus slave), the following requirements and restrictions apply: –...
Page 81 IDT Switch Partitions Notes A port in the disabled mode has the following behavior. – All output signals associated with the port are placed in a negated state (e.g., link status and hot- plug signals). • The negated value of HPxAIN, HPxILOCKP, HPxPEP, HPxPIN, and HPxRSTN is determined as shown in Table 10.2.
Page 82 IDT Switch Partitions Notes All input signals associated with the port, except the SerDes, are ignored and have no effect on the operation of the device. – Boot configuration vector signals are sampled during a switch fundamental reset and thus their dynamic state has no effect on the operating mode of the port in any port mode.
Page 83: Port Operating Mode Change
IDT Switch Partitions Notes A port in the upstream switch port mode has the following behavior. – Has the behavior of an upstream switch port defined by the PCI express base specification. – The LTSSM is operational and behaves as an upstream port. Downstream Switch Port A port in downstream switch port mode behaves as the downstream port of a switch partition.
Page 84 IDT Switch Partitions Notes Changing the operating mode of a port is subject to the requirements and restrictions listed in the sub- sections below. Since an operating mode change may take a significant amount of time to complete, status bits are provided to indicate when the change has started and when it has completed. –...
Page 85: Common Operating Mode Change Behavior
IDT Switch Partitions Notes – The operating mode of a port in upstream switch port mode can’t be later modified to downstream switch port mode, except after a switch fundamental reset. This restriction holds even if the modi- fication from upstream switch port mode to downstream switch port mode goes through interme- diate states (e.g., unattached, disabled).
Page 86 IDT Switch Partitions Notes When a port operating mode change is initiated, the operation logically executes in the following order. 1. The OMCI bit in the SWPORTxSTS register is set. 2. The effect on the source partition, if appropriate, takes place (i.e., cleanly remove the port from the partition).
Page 87 IDT Switch Partitions Notes Upstream port removal: – A switch partition must initiate an exit from L0s on the transmitters of all downstream ports asso- ciated with the partition if it detects an exit from L0s on the receiver of its upstream port. –...
Page 88 IDT Switch Partitions Notes described in section Partition Hot Reset on page 5-9. An upstream port whose link transition to the Detect state (i.e., DL_Down) as a result of the operating mode change may trigger a hot-reset in the destination partition as described in section Partition Hot Reset on page 5-9.
Page 89 IDT Switch Partitions Notes Upstream port addition: – A switch partition must initiate an exit from L0s on the transmitters of all downstream ports asso- ciated with the partition if it detects an exit from L0s on the receiver of its upstream port. See the PCI Express Base specification for details.
Page 90: No Action Mode Change Behavior
IDT Switch Partitions Notes INTx Interrupt Signaling Adding an upstream port to a partition causes the upstream port to adopt the aggregated interrupt state of the downstream ports associated with the destination partition. This may result in the generation of Assert_INTx and Deassert_INTx messages if the new aggregated state is different from that previously reported to the root.
Page 91: Hot Reset Mode Change Behavior
IDT Switch Partitions Hot Reset Mode Change Behavior Notes Modifying the operating mode of a port when the OMA field is set to hot reset has the following behavior in addition to that specified by the common operating mode change behavior. –...
Page 92: Dynamic Reconfiguration
IDT Switch Partitions Notes – Change the port operating mode by setting the following fields in the SWPORTxCTL register. This causes the port to be added to the selected partition. • MODE field to ‘Downstream switch port’ • PART field to the appropriate partition (e.g., 0 or 1) •...
Page 93 IDT Switch Partitions Notes A system may require software notification when a partition reconfiguration occurs. If the reconfiguration results in the addition, removal, or change in operating mode of the upstream port associated with the parti- tion, then the system may be notified of the reconfiguration by a link down event detected by the component upstream of the partition (i.e., the root or switch downstream port).
Page 94 IDT Switch Partitions Notes PES34H16G2 User Manual 6 - 18 April 5, 2013...
Page 95: Link Operation
Chapter 7 Link Operation ® Introduction Notes Link operation in the PES34H16G2 adheres to the PCI Express 2.0 Base Specification, supporting speeds of 2.5 GT/s and 5.0 GT/s. The PES34H16G2 contains sixteen x4 ports which may be merged in pairs to form x8 ports. The default link width of each port is x4 and the SerDes lanes are statically assigned to a port.
Page 96: Figure 7.1 Unmerged Port Lane Reversal For Maximum Link Width Of X4
IDT Link Operation Notes PExRP[0] lane 0 PExRP[0] lane 3 PExRP[1] lane 1 PExRP[1] lane 2 PES34H16G2 PES34H16G2 PExRP[2] lane 2 PExRP[2] lane 1 PExRP[3] lane 3 PExRP[3] lane 0 (a) x4 Port without lane reversal (b) x4 Port with lane reversal PExRP[0] lane 0 PExRP[0]...
Page 97: Figure 7.3 Merged Port Lane Reversal For Maximum Link Width Of X2
IDT Link Operation Notes PExRP[0] lane 1 PExRP[0] lane 0 PExRP[1] lane 0 PExRP[1] lane 1 PExRP[2] PExRP[2] PExRP[3] PExRP[3] PES34H16G2 PES34H16G2 PExRP[4] PExRP[4] PExRP[5] PExRP[5] PExRP[6] PExRP[6] PExRP[7] PExRP[7] (b) x2 Port with lane reversal (a) x2 Port without lane reversal PExRP[0] PExRP[0] lane 0...
Page 98: Figure 7.4 Merged Port Lane Reversal For Maximum Link Width Of X4
IDT Link Operation Notes PExRP[0] lane 3 PExRP[0] lane 0 PExRP[1] lane 2 PExRP[1] lane 1 PExRP[2] lane 1 PExRP[2] lane 2 PExRP[3] lane 0 PExRP[3] lane 3 PES34H16G2 PES34H16G2 PExRP[4] PExRP[4] PExRP[5] PExRP[5] PExRP[6] PExRP[6] PExRP[7] PExRP[7] (b) x4 Port with lane reversal (a) x4 Port without lane reversal PExRP[0] PExRP[0]...
Page 99: Link Width Negotiation
IDT Link Operation Notes PExRP[0] lane 7 PExRP[0] lane 0 PExRP[1] lane 6 PExRP[1] lane 1 PExRP[2] lane 5 PExRP[2] lane 2 PExRP[3] lane 4 PExRP[3] lane 3 PES34H16G2 PES34H16G2 PExRP[4] lane 3 PExRP[4] lane 4 PExRP[5] lane 2 PExRP[5] lane 5 PExRP[6] lane 1...
Page 100: Link Width Negotiation In The Presence Of Bad Lanes
IDT Link Operation Notes The actual link width is determined dynamically during link training. Ports limited to a maximum link width of x8 are capable of negotiating to a x8, x4, x2, or x1 link width. The current negotiated width of a link may be determined from the Negotiated Link Width (NLW) field in the corresponding port’s PCI Express Link Status (PCIELSTS) register.
Page 101: Link Speed Negotiation In The Pes34H16G2
IDT Link Operation Notes A component advertises its supported speeds via the Data Rate Identifier bits in the TS1 and TS2 training sets transmitted to its link partner during link training. The PCIe spec permits a component to change its supported speeds dynamically. It is allowed for a component to advertise supported link speeds without necessarily changing the link speed, via the Recovery LTSSM state.
Page 102: Software Management Of Link Speed
IDT Link Operation Notes The current link speed of each port is reported via the Current Link Speed (CLS) field of the port’s Link Status Register (PCIELSTS). The above behavior applies after full link retrain (i.e., when the LTSSM transi- tions through the ‘Detect’...
Page 103: Link Retraining
IDT Link Operation Notes As mentioned above, the Target Link Speed (TLS) field of the port’s Link Control 2 Register (PCIELCTL2) sets the preferred link speed. By default, the Target Link Speed of each PES34H16G2 port is set to 5.0 GT/s. During normal operation, the link speed of a downstream port may be modified by setting the TLS field of the port’s PCIELCTL2 register to the desired speed and initiating link retraining by writing a one to the Link Retrain (LRET) bit in the Link Control (PCIELCTL) register.
Page 104: Link Down
IDT Link Operation Link Down Notes When an upstream port’s link goes down, it triggers a hot reset in the partition associated with the port, as described in section Partition Hot Reset on page 5-9. In addition: – All TLPs queued in the port’s ingress frame buffer (IFB) are silently discarded. –...
Page 105: Link States
IDT Link Operation Link States Notes PES34H16G2 ports support the following link states: – L0 Fully operational link state – L0s Automatically entered low power state with shortest exit latency – L1 Lower power state than L0s May be automatically entered or directed by software by placing the device in the D3 state –...
Page 106: L0S Aspm
IDT Link Operation L0s ASPM Notes L0s entry/exit operates independently for each direction of the link. On the receive side, the PES34H16G2 upstream and downstream ports always respond to L0s entry/exit requests from the link partner. On the transmit side, the L0s entry conditions must be met for 7us before the hardware transitions the transmit link to the L0s state.
Page 107: L1 Aspm Entry Rejection Timer
IDT Link Operation Notes L1 state from its link partner. If the link partner acknowledges the transition, then the L1 state is entered. Otherwise, L0s entry is attempted A port configured in ‘Upstream Switch Port’ mode initiates L1 entry when all of the conditions listed below are met: –...
Page 108: Link Status
IDT Link Operation Notes Some endpoint devices do not meet the required 10 µs gap between consecutive L1 ASPM entry requests. A live-lock situation can develop in the following scenario: – The Endpoint sends continuous PM_Active_State_Request_L1 DLLPs to the downstream port of a switch.
Page 109: Crosslink
IDT Link Operation Notes During normal operation (i.e, not polling.compliance), de-emphasis selection is done during the Recovery state. The downstream component of the link (i.e., switch upstream port or endpoint) advertises its desired de-emphasis by transmission of training sets. The upstream component of the link (i.e., switch downstream port or root-complex port) notes its link partner desired de-emphasis, and makes a decision about the de-emphasis to be used in the link.
Page 110: Hot Reset Operation On A Crosslink
IDT Link Operation Hot Reset Operation on a Crosslink Notes When a PES34H16G2 port forms a crosslink, hot reset operates as follows. – For a port operating in downstream switch port mode: • Regardless of the physical layer’s mode of operation (i.e., upstream or downstream lanes), the physical layer responds to the reception of training sets with the hot reset bit set by transitioning to the hot reset state as specified in the PCI Express Base Specification.
Page 111: Table 7.2 Gen1 Compatibility Mode: Bits Cleared In Training Sets
IDT Link Operation Notes When a PES34H16G2 port operates in Gen1 Compatibility Mode, the PHY does not set the following bits in Table 7.2 in the training sets that it transmits. PCIe 1.1 and Training Symbol earlier PCI Express 2.0 Definition Definition Reserved 5.0 GT/s Data Rate Support...
Page 112 IDT Link Operation Notes PES34H16G2 User Manual 7 - 18 April 5, 2013...
Page 113: Serdes
Chapter 8 SerDes ® Introduction Notes This chapter describes the controllability of the Serialiazer-Deserializer (SerDes) block associated with each PES34H16G2 port. A SerDes block is composed of the serializing/deserializing logic for four PCI Express lanes (i.e., a SerDes “quad”), plus a central block that controls the quad as a whole. This central block is called CMU, and contains functionality such as a PLL to generate a high-speed clock used by each lane, initialization of the quad, etc.
Page 114: De-Emphasis
IDT SerDes Notes In addition to this, the PES34H16G2 offers proprietary fine grain controllability of the SerDes transmitter voltage level, across a wide range of settings. The PES34H16G2 places no restrictions on the time at which these settings can be modified (e.g., they can be modified during normal operation of the link or while the link is being tested).
Page 115: Receiver Equalization
IDT SerDes Notes tion, signal de-emphasis is turned off. Low-swing mode is a per-link feature, meaning that all lanes of the port operate low-swing simultaneously. Refer to section Low-Swing Transmitter Voltage Mode on page 8-13 for details on enabling low-swing mode on a port. Receiver Equalization In addition to the transmitter controls described above, the PES34H16G2 SerDes also contains a receiver equalizer to compensate for effects of channel loss on received signal (i.e., high-speed signal...
Page 116: Serdes Transmitter Control Registers
IDT SerDes Notes When the Transmit Margin (TM) field in the port’s PCIELCTL2 register is set to ‘Normal Operating Range’, the transmitter voltage level for each SerDes lane of the port is controlled via the S[x]TXLCTL0 and S[x]TXLCTL1 registers. Otherwise, the TM field controls the SerDes voltage directly for all SerDes lanes of the port.
Page 117: Table 8.1 Serdes Transmit Level Controls In The S[X]Txlctl0 And S[X]Txlctl1 Registers
IDT SerDes Notes Relevant fields in Relevant fields in PHY Operation Mode S[x]TXLCTL0 S[x]TXLCTL1 Coarse De- emphasis Slew Rate Voltage Data Drive Level / Fine-De- Control & Control Swing Rate emphasis emphasis Control Transmitter (Course & Fine) Equalization Full-Swing 2.5 GT/s -3.5 dB CDC_FS3DBG1 TX_SLEW_G1 &...
Page 118: Table 8.2 Serdes Transmit Driver Settings In Gen1 Mode
IDT SerDes Notes Settings of Relevant Fields in the S[x]TXLCTL0 & Transmit Levels S[x]TXLCTL1 registers Drive empha- TDVL_ TX_EQ_ CDC_ FDC_ TX_SLEW empha- Level sized FS3DBG1 3DBG1 FS3DBG1 FS3DBG1 Level -3.6 0x1C -3.6 0x1B -3.6 0x1A -3.6 0x19 -3.6 0x18 -3.5 0x17 -3.5...
Page 119: Table 8.3 Serdes Transmit Driver Settings In Gen2 Mode With -3.5Db De-Emphasis
IDT SerDes Notes Settings of Relevant Fields in the S[x]TXLCTL0 & Transmit Levels S[x]TXLCTL1 registers Drive emphas TDVL_ TX_EQ_ CDC_ FDC_ TX_SLEW emphas Level ized FS3DBG2 3DBG2 FS3DBG2 FS3DBG2 Level -3.5 0x1C -3.5 0x1B -3.5 0x1A -3.6 0x19 -3.6 0x18 -3.6 0x17 -3.7...
Page 120: Table 8.4 Serdes Transmit Driver Settings In Gen2 Mode With -6.0Db De-Emphasis
IDT SerDes Notes Table 8.4 shows a number of possible settings for the drive, de-emphasis, and slew rate controls in Gen2 mode with -6.0dB de-emphasis. The default setting is highlighted. As mentioned above, the PCI Express 2.0 spec allows an error of up to +/- 0.5dB on the de-emphasis. All settings listed in the table ensure that the de-emphasis is kept within the allowable range.
Page 121 IDT SerDes Notes Settings of Relevant Fields in the Transmit Levels S[x]TXLCTL0 & S[x]TXLCTL1 registers Drive empha- TDVL_ TX_EQ_ CDC_ FDC_ TX_SLEW empha- Level sized FS6DBG2 6DBG2 FS6DBG2 FS6DBG2 Level -6.0 0x03 -6.1 0x02 -6.2 0x01 -6.3 0x00 Table 8.4 SerDes Transmit Driver Settings in Gen2 Mode with -6.0dB de-emphasis (Part 2 of 2) When the PHY operates in low-swing mode, de-emphasis is automatically turned off.
Page 122: Figure 8.1 De-Emphasis Applied On Link As A Function Of The Fine De-Emphasis And Transmit
IDT SerDes Notes When the PHY operates in Gen2 data rate with -6.0 dB de-emphasis, the fine de-emphasis control (FDC_FS6DBG2 field in the S[x]TXLCTL1 register) has the effect shown in Figure 8.3. In the figure, TXLEV[4:0] refers to the TDVL_FS6DBG2 field in the S[x]TXLCTL1 register. As shown in these figures, the de-emphasis applied on the line varies depending on the setting of the transmit drive level field.
Page 123: Table 8.5 Transmitter Slew Rate Settings
IDT SerDes Notes Figure 8.3 De-emphasis Applied on Link as a Function of the Fine de-emphasis and Transmit Drive Level Controls, when the PHY Operates in Gen1 Data Rate with -6.0 dB Nominal de-emphasis Finally, note that it is possible to turn off de-emphasis (i.e., 0 dB de-emphasis) for a given PHY operating mode by setting the corresponding transmitter equalization control to 0x0, the coarse de-emphasis control to a value of 0x3, and the fine de-emphasis control to a value of 0x7.
Page 124: Transmit Margining Using The Pci Express Link Control 2 Register
IDT SerDes Notes Table 8.5 Transmitter Slew Rate Settings (Part 2 of 2) Transmit Margining using the PCI Express Link Control 2 Register When the Transmit Margin (TM) field in the port’s PCIELCTL2 register is set to a value other than ‘Normal Operating Range’, the transmitter voltage levels are controlled by hardware based on the setting of the TM field, and not by the S[x]TXLCTL0 and S[x]TXLCTL1 registers.
Page 125: Low-Swing Transmitter Voltage Mode
IDT SerDes Notes Finally, when the TM field is modified, the newly selected value is not applied until the PHY LTSSM tran- sitions through the states in which it is allowed to modify the transmit margin setting on the line (e.g., Recovery.RcvrLock).
Page 126: Receiver Equalization Controls
IDT SerDes Notes Drive Level TDVL_LSG2 0x0F 0x0E 0x0D 0x0C 0x0B 0x0A 0x09 0x08 0x07 0x06 0x05 0x04 0x03 0x02 0x01 0x00 Table 8.8 SerDes Transmit Drive Swing in Low Swing Mode at Gen2 Speed When the PHY enters the Polling.Compliance state and low-swing mode is enabled, the following occurs: –...
Page 127: Serdes Power Management
IDT SerDes SerDes Power Management Notes In order to maximize power savings in the SerDes, the PES34H16G2 adheres to the following guide- lines. For SerDes quads that are used, their power state depends on the state of the port(s) associated with the SerDes, as described below.
Page 128 IDT SerDes Notes PES34H16G2 User Manual 8 - 16 April 5, 2013...
Page 129: Theory Of Operation
Chapter 9 Theory of Operation ® Introduction Notes Each PES34H16G2 partition operates logically as a completely independent PCI Express switch that implements the behavior and capabilities required of a switch by the PCI Express Base 2.0 specification. This chapter describes the PES34H16G2-specific architectural behavior for the PCI Express switch associ- ated with each partition.
Page 130: Downstream Port Interrupts
IDT Theory of Operation Notes It follows that MSIs generated by the switch’s ports can’t fall within the multicast BAR aperture in the partition. When this occurs, the behavior is undefined. EN bit in INTXD bit Unmasked MSICAP in PCICMD Action Interrupt Register...
Page 131: Access Control Services
IDT Theory of Operation Notes Upstream Port Interrupt (Port 0) INTA INTB INTC INTD Device (N mod 4) = Device (N mod 4) = Device (N mod 4) = Device (N mod 4) = 0 INTA 0 INTB 0 INTC 0 INTD Device (N mod 4) = Device (N mod 4) =...
Page 132: Figure 9.1 Acs Source Validation Example
IDT Theory of Operation Notes Upstream Port TLP route Completion with Bridge completer-abort status Partition 1 – Virtual PCI Bus ACS Source Validation (TLP is dropped at this point) Bridge Bridge Downstream Ports Figure 9.1 ACS Source Validation Example Figure 9.2 shows an example of ACS peer-to-peer request re-direct at a downstream port. In this case, the offending TLP received by the downstream port is re-directed towards the root-complex.
Page 133: Table 9.4 Prioritization Of Acs Checks For Request Tlps
IDT Theory of Operation Notes Upstream Port Intended TLP Route ACS Re-directed Route Bridge Partition 1 – Virtual PCI Bus ACS Upstream Forwarding Bridge Bridge Downstream Ports Figure 9.3 ACS Upstream Forwarding Example When multiple ACS checks are enabled, they are prioritized as described below. Table 9.4 shows the prioritization for ACS checks associated with the reception of request TLPs.
Page 134: Error Detection And Handling
IDT Theory of Operation Notes ACS Check Priority Comment ACS Upstream For- 2 (Highest) Applicable to request or completion TLPs warding received by the downstream port on its ingress link that target the port’s egress link. This is not considered a peer-to-peer transfer. ACS Peer-to-Peer 1 (Lowest) Applicable to non-relaxed-ordered peer-to-peer...
Page 135: Physical Layer Errors
IDT Theory of Operation Notes A PCI-to-PCI Bridge function claims a TLP in the following cases: – Address Routed TLPs: If received on the primary side of the bridge, the TLPs address falls within the address space range(s) programmed in the base/limit registers. If received on the secondary side of the bridge, always.
Page 136: Transaction Layer Errors
IDT Theory of Operation Notes A DL protocol error occurs when an ACK or NAK DLLP is received and the sequence number specified by AckNak_Seq does not correspond to an unacknowledged TLP or to the value in ACKD_SEQ Transaction Layer Errors Table 9.9 lists non-ACS error checks associated with a PCI-to-PCI bridge function and the action taken when an error is detected.
Page 137: Table 9.9 Transaction Layer Errors Associated With The Pci-To-Pci Bridge Function
IDT Theory of Operation Notes Role Func- Based Express Error tion- (Advisory) Specifica- Action Taken Condition Specific Error tion Error Reporting Section Condition Poisoned TLP 2.7.2.2 Advisory when Detected Parity Error (DPE) bit in the received the correspond- PCISTS or SECSTS register set appro- ing error is con- priately.
Page 138 IDT Theory of Operation Notes Role Func- Based Express Error tion- (Advisory) Specifica- Action Taken Condition Specific Error tion Error Reporting Section Condition Unexpected com- 2.3.2 Yes if a func- Advisory when Non-advisory cases: uncorrectable pletion received tion claims the correspond- error processing.
Page 139: Table 9.10 Conditions Handled As Unsupported Requests (Ur) By The Pci-To-Pci Bridge Function
IDT Theory of Operation Notes PCIe Specifica- Conditions handled as UR Description tion Section Routing Errors Refer to section Routing Errors on page 9-16. Numerous Vendor Defined Type 0 message recep- Vendor Defined Type 0 message which targets the 2.2.8.6 tion PCI-to-PCI bridge function.
Page 140: Table 9.12 Egress Malformed Tlp Error Checks
IDT Theory of Operation Notes TLP Type Error Check Message Requests TC = 0 interrupt message Power management message Error signalling message Unlock message Set power limit message TLPs with Route to Root Complex routing. May only be received on downstream ports TLPs with Broadcast from Root Complex rout- May only be received on upstream ports ing.
Page 141: Table 9.13 Acs Violations For Ports Operating In Downstream Switch Port Mode
IDT Theory of Operation Notes Role Based Express (Advisory) ACS Check Specifica- Error Action Taken tion Reporting Section Condition ACS Source Validation 6.12.1.1 Advisory when If TLP is a non-posted request, a completion the correspond- with ‘completer abort’ status is generated. Note ing error is con- that this is not considered a completer abort figured as non-...
Page 142: Table 9.14 Prioritization Of Transaction Layer Errors
IDT Theory of Operation Notes In addition, the Detected Parity Error bit (DPE) in the PCISTS and SECSTS registers is not subject to error pollution rules and is therefore set when the PCI-to-PCI bridge receives a poisoned TLP on its primary or secondary side respectively, even if error pollution rules indicate that the poisoned TLP received error is superseded by a higher priority error.
Page 143: Table 12.2 Table
IDT Theory of Operation Notes TLP Received by Done Function Handle per Table 12.9 Receiver Overflow Error? Handle per Table 12.9 ECRC TLP Dropped? Error? If ECRC error detected, handle per Table 12.9 but do not log Malformed error; Else, Malformed TLP? handle per Table 12.9 If ECRC detected, handle per Table 12.13...
Page 144: Routing Errors
IDT Theory of Operation Notes Note the following: – Except for ECRC and Poisoned TLP errors, all other errors detected on the received TLP cause the detecting function to consume, drop, or nullify the TLP. – Receiver overflow errors are only checked and logged. –...
Page 145: Bus Locking
IDT Theory of Operation Notes Address Routed TLPs TLPs received by an upstream port that match the upstream port’s address range but which do not match a downstream port’s address range within the partition (i.e., TLPs that do not route through the parti- tion).
Page 146 IDT Theory of Operation Notes A locked transaction sequence is requested by the root complex by issuing a Memory Read Request - Locked (MRdLk) transaction. A lock is established when a lock request is successfully completed with a Completion with Data - Locked (CplDLk). A lock is released with an Unlock message (Msg) sent by the root complex.
Page 147 IDT Theory of Operation Notes Note that when a TLP received by port is blocked from being forwarded due to a bus-locked partition, the TLP is delayed until the partition is unlocked. If the partition is locked for an extended period, this may cause TLPs to be discarded due to switch time-outs.
Page 148 IDT Theory of Operation Notes PES34H16G2 User Manual 9 - 20 April 5, 2013...
Page 149: Hot-Plug And Hot-Swap
Chapter 10 Hot-Plug and Hot-Swap ® Introduction Notes As illustrated in Figures 10.1 through 10.3, a PCIe switch may be used in one of three hot-plug configu- rations. Figure 10.1 illustrates the use of PES34H16G2 in an application in which two downstream ports are connected to slots into which add-in cards may be hot-plugged.
Page 150: Figure 10.2 Hot-Plug With Switch On Add-In Card Application
IDT Hot-Plug and Hot-Swap Notes Upstream Link Add-In Card Port 0 PES34H16G2 Port x Port y PCI Express PCI Express Device Device Figure 10.2 Hot-Plug with Switch on Add-In Card Application Upstream Link Carrier Card Port 0 PES34H16G2 Master SMBus Port x Port y SMBus I/O...
Page 151: Hot-Plug Signals
IDT Hot-Plug and Hot-Swap Notes Associated with all PES34H16G2 ports is a hot-plug controller. However, hot-plug is only supported when a port is configured to operate in downstream switch port mode. Hot-plug is supported within switch partitions. When hot-plug is enabled in a downstream port of a switch partition, the behavior is identical do that expected if the switch partition were a stand-alone PCIe switch.
Page 152: Table 10.2 Negated Value Of Unused Hot-Plug Output Signals
IDT Hot-Plug and Hot-Swap Notes – When the Hot-Plug GPIO Port Map (HPxGPIOPRT) field in the Hot-Plug GPIO Signal Map (HPSIGMAP) register selects an invalid port (i.e., no port or a port that does not exist in the switch), hot-plug GPIO alternate function signal output pin values are equal to their unused value as defined below.
Page 153: Port Reset Outputs
IDT Hot-Plug and Hot-Swap Notes When the MRL Automatic Power Off (MRLPWROFF) bit is set in the HPCFGCTL register and the Manual Retention Latch Sensor Present (MRLP) bit is set in the PCI Express Slot Capability (PCIESCAP) register, then power to the slot is automatically turned off when the MRL sensor indicates that the MRL is open.
Page 154: Power Good Controlled Reset Output
IDT Hot-Plug and Hot-Swap Notes While slot power is disabled, the corresponding downstream port reset output is asserted. When slot power is enabled by writing a zero to the PCC bit, the Port x Power Enable Output (PxPEP) is asserted and then power to the slot is enabled and the corresponding downstream port reset output is negated.
Page 155: Legacy System Hot-Plug Support
IDT Hot-Plug and Hot-Swap Notes the PCI Express Slot Control (PCIESCTL) register or by the HPIE bit: the Attention Button Pressed (ABP), Power Fault Detected (PFD), MRL Sensor Changed (MRLSC), Presence Detected Changed (PDC), Command Completed (CC), and Data Link Layer Active State Change (DLLASC). When an unmasked hot-plug interrupt is generated, the action taken is determined by the MSI Enable (EN) bit in the MSI Capability (MSICAP) register and the Interrupt Disable (INTXD) bit in the PCI Command (PCICMD) register.
Page 156: Hot-Swap
IDT Hot-Plug and Hot-Swap Notes General Purpose Event Enable General Purpose Event Mechanism Interrupt Slot Control Disable Register Activate INTx Hot-Plug Interrupt Mechanism Enable Slot Status Register Activate MSI Mechanism Command Completed Enable Command Completed MSI Enable RW1C RW1C Attention Button Pressed Enable Attention Button Pressed...
Page 157: Notes
Chapter 11 Power Management ® Introduction Notes Located in configuration space of each Function in the PES34H16G2 (i.e., PCI-to-PCI Bridge Function) is a power management capability structure. PES34H16G2 Functions support the following device power management states: – D0 (D0 and D0 uninitialized active –...
Page 158: Table 11.1 Pes34H16G2 Power Management State Transition Diagram
IDT Power Management Notes Partition Reset Uninitialized Active cold Figure 11.1 PES34H16G2 Power Management State Transition Diagram From State To State Description D0 Uninitialized Partition reset (any type). D0 Uninitialized D0 Active Function configured by software D0 Active The Power Management State (PMSTATE) field in the PCI Power Management Control and Status (PMCSR) register is written with the value that corresponds to the D3 state.
Page 159: Pme Messages
IDT Power Management Notes • This requires transitioning the link to the L0 state when the completion needs to be transmitted on the link by the bridge Function and the link is not in L0. – All request TLPs received on the secondary interface are treated as unsupported requests (UR). PME Messages PES34H16G2 does not support generation of PME messages from the D3 state.
Page 160: Power Budgeting Capability
IDT Power Management Power Budgeting Capability Notes PES34H16G2 contains the mechanisms necessary to implement the PCI-Express power budgeting enhanced capability. However, by default, these mechanisms are not enabled. To enable the power budgeting capability, registers in this capability should be initialized and the Next Pointer (NXTPTR) field in one of the other enhanced capabilities should be initialized to point to the power budgeting capability.
Page 161: General Purpose I/O
Chapter 12 General Purpose I/O ® Introduction Notes The PES34H16G2 has 32 General Purpose I/O (GPIO) pins that may be individually configured as: general purpose inputs, general purpose outputs, or alternate functions. GPIO pins are controlled by the General Purpose I/O Function [1:0] (GPIOFUNCx), General Purpose I/O Configuration [1:0] (GPIOCFGx), General Purpose I/O Data [1:0] (GPIODx), and General Purpose I/O Alternate Function Select [1:0] (GPIO- AFSELx) registers.
Page 162 IDT General Purpose I/O Notes GPIO Pin Alternate Function 0 Alternate Function 1 PART0PERSTN — PART1PERSTN — PART2PERSTN — PART3PERSTN — — P0LINKUPN GPEN P0ACTIVEN — — — — IOEXPINTN — HP0APN — HP0PDN — HP0PFN — HP0PWRGDN — HP0MRLN —...
Page 163 IDT General Purpose I/O Notes Alternate function signals are described in Table 12.3. Signal Type Name/Description General Purpose Event. Hot-plug general purpose event output HPxAIN Hot Plug Signal Group x Attention Indicator Output. See hot-plug. HPxAPN Hot Plug Signal Group x Attention Push Button Input. See hot-plug. HPxMRLN Hot Plug Signal Group x Manually Operated Retention Latch Input.
Page 164 IDT General Purpose I/O Notes PES34H16G2 User Manual 12 - 4 April 5, 2013...
Page 165: Smbus Interfaces
Chapter 13 SMBus Interfaces ® Introduction Notes PES34H16G2 has two SMBus interfaces. The slave SMBus interface provides full access to all software visible registers, allowing every register in the device to be read or written by an external SMBus master. The slave SMBus may also be used to program the serial EEPROM used for initialization.
Page 166: Serial Eeprom
IDT SMBus Interfaces Serial EEPROM Notes During a switch fundamental reset, an optional serial EEPROM may be used to initialize any software visible register in the device. Serial EEPROM loading occurs if the Switch Mode (SWMODE) signal selects an operating mode that performs serial EEPROM initialization. The address used by the SMBus interface to access the serial EEPROM is specified by the MSMBADDR[4:1] signals as shown in Table 13.1.
Page 167: Figure 13.2 Single Double Word Initialization Sequence Format
IDT SMBus Interfaces Notes A blank serial EEPROM contains 0xFF in all data bytes. When the PES34H16G2 is configured to initialize from serial EEPROM and the first 256 bytes read from the EEPROM all contain the value 0xFF, then loading of the serial EEPROM is aborted, the computed checksum is ignored, the Blank Serial EEPROM (BLANK) bit is set in the SMBus Status (SMBUSSTS) register, and normal device operation begins (i.e., the device operates in the same manner as though it were not configured to initialize from the serial EEPROM).
Page 168: Figure 13.3 Sequential Double Word Initialization Sequence Format
IDT SMBus Interfaces Notes TYPE Reserved Byte 0 (must be zero) Byte 1 SYSADDR9:2] Byte 2 SYSADDR[18:10] Byte 3 NUMDW[7:0] Byte 4 NUMDW[15:8] Byte 5 DATA0[7:0] Byte 6 DATA0[15:8] Byte 7 DATA0[23:16] Byte 8 DATA0[31:24] Byte 4n+5 DATAn[7:0] Byte 4n+ 6 DATAn[15:8] Byte 4n+7 DATAn[23:16]...
Page 169: Programming The Serial Eeprom
IDT SMBus Interfaces Notes The checksum is verified in the following manner. An 8-bit counter is cleared and the 8-bit sum is computed over the bytes read from the serial EEPROM, including the entire contents of the configuration done sequence. The correct result should always be 0xFF (i.e., all ones).
Page 170: I/O Expanders
IDT SMBus Interfaces Notes To write a byte to the serial EEPROM, the root should configure the ADDR field with the byte address of the serial EEPROM location to be written and set the OP field to “write.” If the serial EEPROM is not busy (i.e., the BUSY bit is cleared), then the write operation may be initiated by writing the value to be written to the DATA field.
Page 171: Table 13.5 I/O Expander Default Output Signal Value
IDT SMBus Interfaces Notes SMBus I/O Section Function Expander Lower / Upper Partition fundamental reset inputs Lower / Upper Link status Lower / Upper Link activity Table 13.4 I/O Expander Function Allocation (Part 2 of 2) During PES34H16G2 initialization, the SMBus/I2C-bus address allocated to each I/O expander used in that system configuration should be written to the corresponding IO Expander Address (IOE[13:0]ADDR) field.
Page 172 IDT SMBus Interfaces Notes The following I/O expander configuration sequence is issued by PES34H16G2 to I/O expanders 0 through 7, 9 and 10 (i.e., the ones that contain general port hot-plug signals and electromechanical interlock signals). – Write the default value of the outputs bits on the lower eight I/O expander pins (i.e., I/O-0.0 through I/O-0.7) to I/O expander register 2.
Page 173 IDT SMBus Interfaces Notes PES34H16G2 has one combined I/O expander interrupt input, labeled IOEXPINTN, which is a GPIO alternate function. Associated with each I/O expander is an open drain interrupt output that is asserted when an I/O expander input pin changes state. The open drain I/O expander interrupt output of all I/O expanders should be tied together on the board and connected to the appropriate GPIO.
Page 174: Table 13.7 Pin Mapping I/O Expander 8
IDT SMBus Interfaces Notes SMBus I/O Expander Type Signal Description 3 (I/O-0.3) PxPWRGDN Port x power good input 4 (I/O-0.4) PxAIN Port x attention indicator output 5 (I/O-0.5) PxPIN Port x power indicator output 6 (I/O-0.6) PxPEP Port x power enable output 7 (I/O-0.7) PxRSTN Port x reset output...
Page 175 IDT SMBus Interfaces Notes SMBus I/O Expander Type Signal Description 9 (I/O-1.1) P9MRLN Port 9 manually operated retention latch (MRL) input 10 (I/O-1.2) P10MRLN Port 10 manually operated retention latch (MRL) input 11 (I/O-1.3) P11MRLN Port 11 manually operated retention latch (MRL) input 12 (I/O-1.4) P12MRLN...
Page 176: Table 13.10 I/O Expander 11 - Partition Fundamental Reset Inputs
IDT SMBus Interfaces Notes I/O Expander 10 SMBus I/O Expander Type Signal Description 0 (I/O-0.0) P8ILOCKST Port 8 electromechanical interlock state input 1 (I/O-0.1) P9ILOCKST Port 9 electromechanical interlock state input 2 (I/O-0.2) P10ILOCKST Port 10 electromechanical interlock state input 3 (I/O-0.3) P11ILOCKST Port 11 electromechanical interlock state input...
Page 177: Table 13.11 I/O Expander 12 - Link Up Status
IDT SMBus Interfaces Notes SMBus I/O Expander Type Signal Description 11 (I/O-1.3) PART11PERSTN Partition 11 Fundamental Reset Input 12 (I/O-1.4) PART12PERSTN Partition 12 Fundamental Reset Input 13 (I/O-1.5) PART13PERSTN Partition 13 Fundamental Reset Input 14 (I/O-1.6) PART14PERSTN Partition 14 Fundamental Reset Input 15 (I/O-1.7) PART15PERSTN Partition 15 Fundamental Reset Input...
Page 178: Slave Smbus Interface
IDT SMBus Interfaces Notes I/O Expander 13 SMBus I/O Expander Type Signal Description 0 (I/O-0.0) P0ACTIVEN Port 0 Link active status output 1 (I/O-0.1) P1ACTIVEN Port 1 Link active status output 2 (I/O-0.2) P2ACTIVEN Port 2 Link active status output 3 (I/O-0.3) P3ACTIVEN Port 3 Link active status output...
Page 179: Smbus Transactions
IDT SMBus Interfaces Notes Address Address Bit Value SSMBADDR[5] Table 13.13 Slave SMBus Address (Part 2 of 2) SMBus Transactions The slave SMBus interface responds to the following SMBus transactions initiated by an SMBus master. See the SMBus 2.0 specification for a detailed description of these transactions. –...
Page 180: Table 13.15 Csr Register Read Or Write Operation Byte Sequence
IDT SMBus Interfaces Notes The FUNCTION field in the command code indicates if the SMBus operation is a system address register read/write or a serial EEPROM read/write operation. Since the format of these transactions is different. They will be described individually in the following sections. If a command is issued while one is already in progress or if the slave is unable to supply data associated with a command, then the command is NACKed.
Page 181: Table 13.16 Csr Register Read Or Write Cmd Field Description
IDT SMBus Interfaces Notes Name Type Description Field BELL Read/Write Byte Enable Lower. When set, the byte enable for bits [7:0] of the data word is enabled. BELM Read/Write Byte Enable Lower Middle. When set, the byte enable for bits [15:8] of the data word is enabled.
Page 182: Table 13.18 Serial Eeprom Read Or Write Cmd Field Description
IDT SMBus Interfaces Notes Byte Field Description Position Name EEADDR Serial EEPROM Address. This field specifies the address of the Serial EEPROM on the Master SMBus when the USA bit is set in the CMD field. Bit zero must be zero and thus the 7-bit address must be left justified.
Page 183: Figure 13.9 Serial Eeprom Read Using Smbus Block Write/Read Transactions With Pec
IDT SMBus Interfaces Notes Sample Slave SMBus Operation This section illustrates sample Slave SMBus operations. Shaded items are driven by PES34H16G2’s slave SMBus interface and non-shaded items are driven by an SMBus host. PES34H16G2 Slave CCODE BYTCNT=3 CMD=read ADDRL ADDRU SMBus Address START,END PES34H16G2 Slave...
Page 184: Figure 13.11 Serial Eeprom Write Using Smbus Block Write Transactions With Pec Disabled
IDT SMBus Interfaces Notes PES34H16G2 Slave CCODE BYTCNT=5 CMD=write EEADDR ADDRL SMBus Address START,END ADDRU DATA Figure 13.11 Serial EEPROM Write Using SMBus Block Write Transactions with PEC Disabled PES34H16G2 Slave CCODE BYTCNT=5 CMD=write EEADDR ADDRL SMBus Address START,END ADDRU DATA Figure 13.12 Serial EEPROM Write Using SMBus Block Write Transactions with PEC Enabled PES34H16G2 Slave...
Page 185: Multicast
Chapter 14 Multicast ® Introduction Notes The PES34H16G2 implements multicast within switch partitions as defined by the PCI-SIG Multicast ECN. The multicast capability enables a single TLP to be forwarded to multiple destinations. The destina- tions to which a multicast TLP is forwarded are referred to as a multicast group. –...
Page 186: Figure 14.1 Multicast Group Address Ranges
IDT Multicast Notes Only posted memory write TLPs and address routed message TLPs can be multicast TLPs. The primary determinant of whether or not a memory write or address routed message TLP is a multicast TLP is its address and the address associated with multicast address regions. A multicast address region may overlap a non-multicast address region.
Page 187: Figure 14.2 Multicast Group Address Region Determination
IDT Multicast Notes The starting address of the region associated multicast group zero is equal to the multicast base address defined by the Multicast Base Address Low (MCBARL) field in the MCBARL register and the Multi- cast Base Address High (MCBARH) field in the Multicast Base Address High (MCBARH) register. –...
Page 188: Multicast Tlp Routing
IDT Multicast Notes Note that the “block all” and “block untranslated” functions are performed at the ingress port on which the multicast TLP was received. A received multicast TLP without errors is forwarded to egress ports as described in the next section. Multicast TLP Routing A multicast TLP received without error by a function is forwarded as described in this section.
Page 189 IDT Multicast Notes A side-effect of modifying the address due to multicast overlay processing is that the ECRC associated with the original TLP may not be correct for the new modified TLP. Therefore, functions perform the following ECRC processing: – If multicast overlay processing is disabled, then no ECRC processing is performed as part of multi- cast egress processing.
Page 190 IDT Multicast Notes PES34H16G2 User Manual 14 - 6 April 5, 2013...
Page 191: Register Organization
Chapter 15 Register Organization ® Introduction Notes All software visible registers in the PES34H16G2 are contained in a 256 KB global address space. The address of a register in this address range is referred to as the system address of the register. –...
Page 192: Partial-Byte Access To Word And Dword Registers
IDT Register Organization Notes The switch configuration and status register region contains registers that control general operation of the switch or that are proprietary in nature. – The offset address switch configuration and status registers is defined in section Switch Configu- ration and Status Registers on page 15-12.
Page 193: Address Maps
IDT Register Organization Address Maps Notes This section describes the address maps for regions of the global address space outlined in Table 15.1. Reserved address ranges are outlined in Table 15.1. Reading from a reserved address range returns and undefined value. Writes to a reserved address range complete successfully and have an undefined behavior.
Page 194: Table 15.2 Default Pci Capability List Linkage
IDT Register Organization Notes Default Value of PCI Capability Structure Next Pointer Field (NXTPTR) Offset in Name Configuration Space PCI Express Capability (PCIECAP) 0x040 0x0C0 0x0C0 PCI Power Management Capability (PMCAP) 0x0C0 0x0D0 Message Signaled Interrupt Capability (MSICAP) 0x0D0 Subsystem ID and Subsystem Vendor Capability 0x0F0 (SSIDSSVIDCAP) Table 15.2 Default PCI Capability List Linkage...
Page 195: Figure 15.1 Pci-To-Pci Bridge Configuration Space Organization
IDT Register Organization 0x000 PCI Configuration Space (64 Dwords) 0x000 0x100 Advanced Error Reporting Enhanced Capability 0x180 Device Serial Number Enhanced Capability Type 1 Configuration Header 0x200 PCIe Virtual Channel Enhanced Capability 0x280 Power Budgeting Enhanced Capability 0x040 0x320 PCI Express Capability Structure ACS Enhanced Capability 0x330...
Page 196: Table 15.4 Pci-To-Pci Bridge Configuration Space Registers
IDT Register Organization Cfg. Register Size Register Definition Offset Mnemonic 0x000 Word VID - Vendor Identification Register (0x000) on page 16-1 0x002 Word DID - Device Identification Register (0x002) on page 16-1 0x004 Word PCICMD PCICMD - PCI Command Register (0x004) on page 16-1 0x006 Word PCISTS...
Page 197 IDT Register Organization Cfg. Register Size Register Definition Offset Mnemonic 0x044 DWord PCIEDCAP PCIEDCAP - PCI Express Device Capabilities (0x044) on page 16-11 0x048 Word PCIEDCTL PCIEDCTL - PCI Express Device Control (0x048) on page 16-13 0x04A Word PCIEDSTS PCIEDSTS - PCI Express Device Status (0x04A) on page 16-14 0x04C DWord PCIELCAP...
Page 198 IDT Register Organization Cfg. Register Size Register Definition Offset Mnemonic 0x10C Dword AERUESV AERUESV - AER Uncorrectable Error Severity (0x10C) on page 16-36 0x110 Dword AERCES AERCES - AER Correctable Error Status (0x110) on page 16-37 0x114 Dword AERCEM AERCEM - AER Correctable Error Mask (0x114) on page 16-38 0x118 Dword AERCTL...
Page 199 IDT Register Organization Cfg. Register Size Register Definition Offset Mnemonic 0x30C Dword PWRBDV3 PWRBDV[7:0] - Power Budgeting Data Value [7:0] (0x300 - 0x31C) on page 16-48 0x310 Dword PWRBDV4 PWRBDV[7:0] - Power Budgeting Data Value [7:0] (0x300 - 0x31C) on page 16-48 0x314 Dword...
Page 200: Idt Proprietary Port Specific Registers
IDT Register Organization IDT Proprietary Port Specific Registers Notes This section outlines the address range 0x400 through 0xFFF in the PCI-to-PCI bridge address space. This address range contains IDT proprietary registers that are port specific. Registers in this address range may be accessed using PCI configuration requests to the corresponding PCI-to-PCI bridge function 0 header, global address space access registers, SMBus, or serial EEPROM.
Page 201: Table 15.5 Proprietary Port Specific Registers
IDT Register Organization Notes Cfg. Register Size Register Definition Offset Mnemonic 0x420 Dword PCIESCTLIV PCIESCTLIV - PCI Express Slot Control Initial Value (0x420) on page 16-57 0x480 DWord IERRORCTL IERRORCTL - Internal Error Reporting Control (0x480) on page 16- 0x484 DWord IERRORSTS IERRORSTS - Internal Error Reporting Status (0x484) on page 16-...
Page 202: Switch Configuration And Status Registers
IDT Register Organization Switch Configuration and Status Registers Notes This section outlines switch configuration and status registers. These registers are accessible using global address space access registers (i.e., GASAADDR and GASADATA), SMBus, or serial EEPROM. Figure 15.3 shows the organization of the address space. Registers in this address range are referenced as REGNAME where REGNAME represents the register name in Table 15.6.
Page 203: Table 15.6 Switch Configuration And Status
IDT Register Organization Notes Cfg. Register Size Register Definition Offset Mnemonic 0x0000 DWord SWCTL SWCTL - Switch Control (0x0000) on page 17-1 0x0004 DWord BCVSTS BCVSTS - Boot Configuration Vector Status (0x0004) on page 17-2 USSBRDELAY - Upstream Secondary Bus Reset Delay (0x008C) 0x008C DWord USSBRDELAY...
Page 204 IDT Register Organization Notes Cfg. Register Size Register Definition Offset Mnemonic 0x0300 DWord SWPORT0CTL SWPORT[15:0]CTL - Switch Port x Control on page 17-5 0x0304 DWord SWPORT0STS SWPORT[15:0]STS - Switch Port x Status on page 17-6 0x0320 DWord SWPORT1CTL SWPORT[15:0]CTL - Switch Port x Control on page 17-5 0x0324 DWord SWPORT1STS...
Page 205 IDT Register Organization Notes Cfg. Register Size Register Definition Offset Mnemonic 0x0804 DWord S0TXLCTL0 S[15:0]TXLCTL0 - SerDes x Transmitter Lane Control 0 on page 17- 0x0808 DWord S0TXLCTL1 S[15:0]TXLCTL1 - SerDes x Transmitter Lane Control 1 on page 17- 0x0810 DWord S0RXEQLCTL S[15:0]RXEQLCTL - SerDes x Receiver Equalization Lane Control...
Page 206 IDT Register Organization Notes Cfg. Register Size Register Definition Offset Mnemonic 0x08C4 DWord S6TXLCTL0 S[15:0]TXLCTL0 - SerDes x Transmitter Lane Control 0 on page 17- 0x08C8 DWord S6TXLCTL1 S[15:0]TXLCTL1 - SerDes x Transmitter Lane Control 1 on page 17- 0x08D0 DWord S6RXEQLCTL S[15:0]RXEQLCTL - SerDes x Receiver Equalization Lane Control...
Page 207 IDT Register Organization Notes Cfg. Register Size Register Definition Offset Mnemonic 0x0984 DWord S12TXLCTL0 S[15:0]TXLCTL0 - SerDes x Transmitter Lane Control 0 on page 17- 0x0988 DWord S12TXLCTL1 S[15:0]TXLCTL1 - SerDes x Transmitter Lane Control 1 on page 17- 0x0990 DWord S12RXEQLCTL S[15:0]RXEQLCTL - SerDes x Receiver Equalization Lane Control...
Page 208 IDT Register Organization Notes Cfg. Register Size Register Definition Offset Mnemonic HPCFGCTL - Hot-Plug Configuration Control (0x0ABC) on page 17- 0x0ABC DWord HPCFGCTL 0x0AC8 DWord SMBUSSTS SMBUSSTS - SMBus Status (0x0AC8) on page 17-21 0x0ACC DWord SMBUSCTL SMBUSCTL - SMBus Control (0x0ACC) on page 17-23 0x0AD0 DWord EEPROMINTF...
Page 209: Pci To Pci Bridge And Proprietary Port Specific Registers
Chapter 16 PCI to PCI Bridge and Proprie- tary Port Specific Registers ® Type 1 Configuration Header Registers VID - Vendor Identification Register (0x000) Field Default Type Description Field Name Value 15:0 0x111D Vendor Identification. This field contains the 16-bit vendor ID value assigned to IDT.
Page 210 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value VGAS VGA Palette Snoop. Not applicable. PERRE Parity Error Response Enable. This bit controls the logging of poisoned TLPs in the Master Data Parity Error bit (MDPED) in the PCI Status (PCISTS) register.
Page 211 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value MDPED RW1C Master Data Parity Error Detected. This bit is set by the bridge function if the PERRE bit in the PCI Command register (PCICMD) is set to 0x1 and either of the following two conditions occurs: the function receives a Poisoned Completion going Downstream, or the function transmits a Poisoned Request Upstream.
Page 212 IDT PCI to PCI Bridge and Proprietary Port Specific Registers CLS - Cache Line Size Register (0x00C) Field Default Type Description Field Name Value 0x00 Cache Line Size. This field has no effect on the bridge’s function- ality but may be read and written by software. This field is implemented for compatibility with legacy software.
Page 213 IDT PCI to PCI Bridge and Proprietary Port Specific Registers PBUSN - Primary Bus Number Register (0x018) Field Default Type Description Field Name Value PBUSN Primary Bus Number. This field is used to record the bus number of the PCI bus segment to which the primary interface of the bridge is connected.
Page 214 IDT PCI to PCI Bridge and Proprietary Port Specific Registers IOLIMIT - I/O Limit Register (0x01D) Field Default Type Description Field Name Value IOCAP I/O Capability. Indicates if the bridge supports 16-bit or 32-bit I/O addressing. This bit always reflects the value of the IOCAP field in the IOBASE register.
Page 215 IDT PCI to PCI Bridge and Proprietary Port Specific Registers MBASE - Memory Base Register (0x020) Field Default Type Description Field Name Value Reserved Reserved field. 15:4 MBASE 0xFFF Memory Address Base. The MBASE and MLIMIT registers are used to control the forwarding of non-prefetchable transactions between the primary and secondary interfaces of the bridge.
Page 216 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value Reserved Reserved field. 15:4 PMLIMIT Prefetchable Memory Address Limit. The PMBASE, PMBASEU, PMLIMIT and PMLIMITU registers are used to control the forward- ing of prefetchable transactions between the primary and second- ary interfaces of the bridge.
Page 217 IDT PCI to PCI Bridge and Proprietary Port Specific Registers CAPPTR - Capabilities Pointer Register (0x034) Field Default Type Description Field Name Value CAPPTR 0x40 Capabilities Pointer. This field specifies a pointer to the head of the capabilities structure. EROMBASE - Expansion ROM Base Address Register (0x038) Field Default Type...
Page 218 IDT PCI to PCI Bridge and Proprietary Port Specific Registers BCTL - Bridge Control Register (0x03E) Field Default Type Description Field Name Value PERRE Parity Error Response Enable. This bit controls the logging of poisoned TLPs in the Master Data Parity Error bit (MDPED) in the Secondary Status (SECSTS) register.
Page 219: Pci Express Capability Structure
IDT PCI to PCI Bridge and Proprietary Port Specific Registers PCI Express Capability Structure PCIECAP - PCI Express Capability (0x040) Field Default Type Description Field Name Value CAPID 0x10 Capability ID. The value of 0x10 identifies this capability as a PCI Express capability structure.
Page 220 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value E0AL Endpoint L0s Acceptable Latency. This field indicates the acceptable total latency that an endpoint can withstand due to tran- sition from the L0s state to the L0 state. The value is hardwired to 0x0 as this field is only applicable to end- point functions.
Page 221 IDT PCI to PCI Bridge and Proprietary Port Specific Registers PCIEDCTL - PCI Express Device Control (0x048) Field Default Type Description Field Name Value CEREN Correctable Error Reporting Enable. This bit controls reporting of correctable errors. NFEREN Non-Fatal Error Reporting Enable. This bit controls reporting of non-fatal errors.
Page 222 IDT PCI to PCI Bridge and Proprietary Port Specific Registers PCIEDSTS - PCI Express Device Status (0x04A) Field Default Type Description Field Name Value RW1C Correctable Error Detected. This bit indicates the status of cor- rectable errors. Errors are logged in this register regardless of whether error reporting is enabled or not.
Page 223 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value MAXLNK- HWINIT Maximum Link Width. This field indicates the maximum link width WDTH of the given PCI Express link. This field may be overridden to allow the link width to be forced to a smaller value.
Page 224 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value Upstream: Link Bandwidth Notification Capability. When set, this bit indi- cates support for the link bandwidth notification status and interrupt mechanisms. The switch downstream ports support the capability. Downstream: This field is not applicable for the upstream port and must be zero.
Page 225 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value LRET Upstream Link Retrain. Writing a one to this field initiates Link retraining by Port: directing the Physical Layer LTSSM to the Recovery state. This field always returns zero when read.
Page 226 IDT PCI to PCI Bridge and Proprietary Port Specific Registers PCIELSTS - PCI Express Link Status (0x052) Field Default Type Description Field Name Value Current Link Speed. This field indicates the current link speed of the port. 1 - (gen1) 2.5 GT/s 2 - (gen2) 5 GT/s others - reserved HWINIT...
Page 227 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value LBWSTS RW1C Link Bandwidth Management Status. This bit is set to indicate that either of the following have occurred without the link transition- ing through the DL_Down state.
Page 228 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value Hot Plug Surprise. When set, this bit indicates that a device pres- ent in the slot may be removed from the system without notice. This bit is read-only and has a value of zero when the SLOT bit in the PCIECAP register is cleared.
Page 229 IDT PCI to PCI Bridge and Proprietary Port Specific Registers PCIESCTL - PCI Express Slot Control (0x058) Field Default Type Description Field Name Value ABPE HWINIT Attention Button Pressed Enable. This bit when set enables generation of a Hot-Plug interrupt or wake-up event on an attention button pressed event.
Page 230 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value HWINIT Attention Indicator Control. When read, this register returns the current state of the Attention Indicator. Writing to this register sets the indicator. This bit is read-only and has a value of zero when the correspond- ing capability is not enabled in the PCIESCAP register.
Page 231 IDT PCI to PCI Bridge and Proprietary Port Specific Registers PCIESSTS - PCI Express Slot Status (0x05A) Field Default Type Description Field Name Value RW1C Attention Button Pressed. Set when the attention button is pressed. RW1C Power Fault Detected. Set when the Power Controller detects a power fault.
Page 232 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value DLLLASC RW1C Data Link Layer Link Active State Change. This bit is set when the state of the data link layer active field in the link status register changes state.
Page 233 IDT PCI to PCI Bridge and Proprietary Port Specific Registers PCIELCAP2 - PCI Express Link Capabilities 2 (0x06C) Field Default Type Description Field Name Value 31:0 Reserved Reserved field. PCIELCTL2 - PCI Express Link Control 2 (0x070) Field Default Type Description Field Name...
Page 234 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value Transmit Margin. This field controls the value of the non de- Sticky emphasized voltage level at the transmitter pins. This field is reset to 0x0 on entry to the LTSSM Polling.Configuration substate.
Page 235: Power Management Capability Structure
IDT PCI to PCI Bridge and Proprietary Port Specific Registers PCIELSTS2 - PCI Express Link Status 2 (0x072) Field Default Type Description Field Name Value Current De-emphasis. The value of this bit indicates the current de-emphasis level when the link operates in 5.0 Gbps. 0x0 - De-emphasis level = -6.0 dB 0x1 - De-emphasis level = -3.5 dB The value of this bit in undefined when the link operates at...
Page 236 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value 18:16 Power Management Capability Version. This field indicates compliance with version two of the specification. Complies with version the PCI Bus Power Management Interface Specification, Revision 1.2.
Page 237: Message Signaled Interrupt Capability Structure
IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value PMEE PME Enable. When this bit is set, PME message generation is Sticky enabled for the port. If a hot plug wake-up event is desired when exiting the D3 cold state, then this bit should be set during serial EEPROM initializa- tion.
Page 238 IDT PCI to PCI Bridge and Proprietary Port Specific Registers MSIADDR - Message Signaled Interrupt Address (0x0D4) Field Default Type Description Field Name Value Reserved Reserved field. 31:2 ADDR Message Address. This field specifies the lower portion of the DWORD address of the MSI memory write transaction. The switch assumes that all downstream port generated MSIs are targeted to the root and routes these transactions to the upstream port.
Page 239: Subsystem Id And Subsystem Vendor Id
IDT PCI to PCI Bridge and Proprietary Port Specific Registers Subsystem ID and Subsystem Vendor ID SSIDSSVIDCAP - Subsystem ID and Subsystem Vendor ID Capability (0x0F0) Field Default Type Description Field Name Value CAPID Capability ID. The value of 0xD identifies this capability as a SSID/ SSVID capability structure.
Page 240: Advanced Error Reporting (Aer) Enhanced Capability
IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value 11:8 EREG Extended Register Number. This field selects the extended con- figuration register number as defined by Section 7.2.2 of the PCI Express Base Specification, Rev. 2.0. The value of this register must not be programmed to point to the address offset of this register (i.e., 0xF8) or the ECFGDATA regis- ter (i.e., 0xFC).
Page 241 IDT PCI to PCI Bridge and Proprietary Port Specific Registers AERUES - AER Uncorrectable Error Status (0x104) Field Default Type Description Field Name Value UDEF RW1C Undefined. This bit is no longer used in this version of the specifi- Sticky cation.
Page 242 IDT PCI to PCI Bridge and Proprietary Port Specific Registers AERUEM - AER Uncorrectable Error Mask (0x108) Field Default Type Description Field Name Value UDEF Undefined. This bit is no longer used in this version of the specifi- Sticky cation. Reserved Reserved field.
Page 243 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value UECOMP Unexpected Completion Mask. When this bit is set, the corre- Sticky sponding bit in the AERUES register is masked. When a bit is masked in the AERUES register, the corresponding event is not logged in the advanced capability structure, the First Error Pointer field (FEPTR) in the AERCTL register is not updated, and an error...
Page 244 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value Uncorrectable Internal Error Mask. When this bit is set, the cor- Sticky responding bit in the AERUES register is masked. When a bit is masked in the AERUES register, the corresponding event is not logged in the advanced capability structure, the First Error Pointer field (FEPTR) in the AERCTL register is not updated, and an error...
Page 245 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value COMPTO Completion Timeout Severity. A switch port does not initiate non- posted requests on its own behalf. Therefore, this field is hardwired to zero. CABORT Completer Abort Severity.
Page 246 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value BADTLP RW1C Bad TLP Status. This bit is set when a bad TLP is detected. Sticky BADDLLP RW1C Bad DLLP Status. This bit is set when a bad DLLP is detected. Sticky RPLYROVR RW1C...
Page 247 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value BADDLLP Bad DLLP Mask. When this bit is set, the corresponding bit in the Sticky AERCES register is masked. When a bit is masked in the AERCES register, the corresponding event is not reported to the root com- plex.
Page 248 IDT PCI to PCI Bridge and Proprietary Port Specific Registers AERCTL - AER Control (0x118) Field Default Type Description Field Name Value FEPTR First Error Pointer. This field contains a pointer to the bit in the Sticky AERUES register that resulted in the first reported error. This field is valid only when the bit in the AERUES register pointed to by this field is set.
Page 249: Device Serial Number Enhanced Capability
IDT PCI to PCI Bridge and Proprietary Port Specific Registers AERHL4DW - AER Header Log 4th Doubleword (0x128) Field Default Type Description Field Name Value 31:0 Header Log. This field contains the 4th doubleword of the TLP Sticky header that resulted in the first reported uncorrectable error. Device Serial Number Enhanced Capability SNUMCAP - Serial Number Capabilities (0x180) Field...
Page 250: Pci Express Virtual Channel Capability
IDT PCI to PCI Bridge and Proprietary Port Specific Registers PCI Express Virtual Channel Capability PCIEVCECAP - PCI Express VC Enhanced Capability Header (0x200) Field Default Type Description Field Name Value 15:0 CAPID Capability ID. The value of 0x2 indicates a virtual channel capabil- ity structure.
Page 251 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value 31:24 VCATBLOFF VC Arbitration Table Offset. Not applicable (only the default VC 0 is implemented). PVCCTL - Port VC Control (0x20C) Field Default Type Description Field...
Page 252 IDT PCI to PCI Bridge and Proprietary Port Specific Registers VCR0CTL- VC Resource 0 Control (0x214) Field Default Type Description Field Name Value TCVCMAP bit 0: 0xFF TC/VC Map. This field indicates the TCs that are mapped to the VC resource. Each bit corresponds to a TC.
Page 253 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value VCNEG VC Negotiation Pending. This bit is not applicable for VC0 and is therefore hardwired to 0x0. 31:18 Reserved Reserved field. VCR0TBL0 - VC Resource 0 Port Arbitration Table Entry 0 (0x240) Field Default Type...
Page 254 IDT PCI to PCI Bridge and Proprietary Port Specific Registers VCR0TBL1 - VC Resource 0 Port Arbitration Table Entry 1 (0x244) Field Default Type Description Field Name Value PHASE8 Phase 8. This field contains the port ID for the corresponding port arbitration period.
Page 255: Power Budgeting Enhanced Capability
IDT PCI to PCI Bridge and Proprietary Port Specific Registers VCR0TBL3 - VC Resource 0 Port Arbitration Table Entry 3 (0x24C) Field Default Type Description Field Name Value PHASE24 Phase 24. This field contains the port ID for the corresponding port arbitration period.
Page 256 IDT PCI to PCI Bridge and Proprietary Port Specific Registers PWRBDSEL - Power Budgeting Data Select (0x284) Field Default Type Description Field Name Value DVSEL Data Value Select. This field selects the Power Budgeting Data Value (PWRBDVx) register whose contents are reported in the Data (DATA) field of the Power Budgeting Data (PWRBD) register.
Page 257: Acs Extended Capability
IDT PCI to PCI Bridge and Proprietary Port Specific Registers ACS Extended Capability ACSECAPH - ACS Extended Capability Header (0x320) Field Default Type Description Field Name Value 15:0 CAPID Capability ID. The value of 0xD indicates an ACS extended capa- bility structure.
Page 258 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value Upstre Upstream ACS Upstream Forwarding. If set, indicates the port implements Port: ACS Upstream Forwarding. Port: Downstream Down- Port: stream Port: Upstre Upstream ACS P2P Egress Control.
Page 259 IDT PCI to PCI Bridge and Proprietary Port Specific Registers ACSCTL - ACS Control Register (0x326) Field Default Type Description Field Name Value Upstream Port: ACS Source Validation Enable. When set, the port performs ACS Source Validation. Downstream NOTE: This field remains read-write (RW) for downstream ports, Port: even if the corresponding bit in the ACSCAP register is cleared.
Page 260: Multicast Extended Capability
IDT PCI to PCI Bridge and Proprietary Port Specific Registers ACSECV - ACS Egress Control Vector (0x328) Field Default Type Description Field Name Value 15:0 See Description Egress Control Vector. This field is used to configure ACS peer- to-peer egress control. The value in this field is only valid when ACS peer-to-peer egress control is enabled in the ACSCTL regis- ter.
Page 261 IDT PCI to PCI Bridge and Proprietary Port Specific Registers MCCAP - Multicast Capability (0x334) Field Default Type Description Field Name Value MAXGROUP 0x1F Max Multicast Groups. This field indicates the default number of multicast groups supported by the switch partition, which is 32. The maximum number of supported groups is 64, and this field may be re-programmed during initial switch configuration (e.g., via EEPROM) to 0x3F to enable support for 64 multicast groups.
Page 262 IDT PCI to PCI Bridge and Proprietary Port Specific Registers MCBARH- Multicast Base Address High (0x33C) Field Default Type Description Field Name Value 31:0 MCBARH Multicast BAR High. This field specifies the upper 32-bits (i.e., bits 32 through 63) of the multicast BAR. The behavior is undefined if bits in this field corresponding to address bits that contain the multicast group number or those less than the multicast index position (i.e., INDEXPOS) are non-zero.
Page 263 IDT PCI to PCI Bridge and Proprietary Port Specific Registers MCBLKALLL- Multicast Block All Low (0x348) Field Default Type Description Field Name Value 31:0 MCBLKALL Multicast Block All. Each bit in this field corresponds to one of the lower 32 multicast groups (e.g., bit 0 corresponds to multicast group 0, bit 1 corresponds to multicast group 1, and so on).
Page 264 IDT PCI to PCI Bridge and Proprietary Port Specific Registers MCBLKUTH - Multicast Block Untranslated High (0x354) Field Default Type Description Field Name Value 31:0 MCBLKUT Multicast Block Untranslated. Each bit in this field corresponds to one of the upper 32 multicast groups (e.g., bit 0 corresponds to multicast group 32, bit 1 corresponds to multicast group 33, and so on).
Page 265: Proprietary Port Specific Registers
IDT PCI to PCI Bridge and Proprietary Port Specific Registers Proprietary Port Specific Registers Port Control and Status Registers PCIESCTLIV - PCI Express Slot Control Initial Value (0x420) Field Default Type Description Field Name Value ABPE Attention Button Pressed Enable. SWSticky This field contains the initial value of the corresponding field in the PCI Express Slot Control (PCIESCTL) register when the corre-...
Page 266 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value HPIE Hot Plug Interrupt Enable. SWSticky This field contains the initial value of the corresponding field in the PCI Express Slot Control (PCIESCTL) register when the corre- sponding slot or hot-plug capability is enabled.
Page 267: Internal Error Control And Status Registers
IDT PCI to PCI Bridge and Proprietary Port Specific Registers Internal Error Control and Status Registers IERRORCTL - Internal Error Reporting Control (0x480) Field Default Type Description Field Name Value IERROREN Internal Error Reporting Enable. When this bit is set, internal SWSticky error reporting is enabled and reported through AER.
Page 268 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value RW1C Unreliable Link Detected. This bit is set when the ULD bit is set in SWSticky the port’s Autonomous Link Reliability Status (ALRSTS) register. RBCTLSBE RW1C Replay Buffer Control Single Bit Error.
Page 269 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value IFBDATSBE IFB Data Single Bit Error. When this bit is set, the corresponding SWSticky error bit in the IERRORSTS register is masked from reporting an internal error to the AER Capability Structure.
Page 270 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value RBCTLSBE Replay Buffer Control Single Bit Error. When this bit is set, the SWSticky corresponding error bit in the IERRORSTS register is masked from reporting an internal error to the AER Capability Structure.
Page 271 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value EFBCPTLPTO EFB Completion TLP Time-Out. This bit controls how an SWSticky unmasked error of the corresponding type is reported. When this bit is set and the corresponding status bit is set and unmasked, then the error is reported as an uncorrectable internal error.
Page 272 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value EFBCTLDBE EFB Control Double Bit Error. This bit controls how an SWSticky unmasked error of the corresponding type is reported. When this bit is set and the corresponding status bit is set and unmasked, then the error is reported as an uncorrectable internal error.
Page 273 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value EFBPTLPTO EFB Posted TLP Time-Out. Writing a one to this bit sets the cor- responding bit in the IERRORSTS register. This bit always returns a value of zero when read.
Page 274: Physical Layer Control And Status Registers
IDT PCI to PCI Bridge and Proprietary Port Specific Registers Physical Layer Control and Status Registers SERDESCFG - SerDes Configuration (0x510) Field Default Type Description Field Name Value RCVD_OVRD Receiver Detect Override. Each bit in this register corresponds to SWSticky a SerDes lane.
Page 275 IDT PCI to PCI Bridge and Proprietary Port Specific Registers LANESTS1 - Lane Status 1 (0x520) Field Default Type Description Field Name Value RW1C Receiver Underflow Detected. Each bit in this field corresponds Sticky to a SerDes lane associated with the port. A bit is set when the corresponding link receiver is unable to com- pensate for clock variance between link partners and has inserted one or more zero bytes into the stream.
Page 276 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value 13:12 Reserved Reserved field. ILSCC Downstream: Initial Link Speed Change Control. This field determines whether a port automatically initiates a speed change to Gen2 speed, if Gen2 speed is permissible, after initial entry to L0 from Detect.
Page 277: Power Management Control And Status Registers
IDT PCI to PCI Bridge and Proprietary Port Specific Registers Power Management Control and Status Registers L1ASPMRTC - L1 ASPM Rejection Timer Control (0x710) Field Default Type Description Field Name Value 13:0 MTL1ER 0x947 Minimum Time between L1 Entry Requests. This field indicates SWSticky the minimum time (in 250Mhz cycles) that the port waits between detecting consecutive L1 ASPM entry requests.
Page 278 IDT PCI to PCI Bridge and Proprietary Port Specific Registers Field Default Type Description Field Name Value Reserved Reserved field. 15:6 CNSTLIMIT 0x10 Constant Limit. This field is used to control the algorithm used to SWSticky compute the completion size estimate for non-posted read requests when request metering is enabled.
Page 279: Global Address Space Access Registers
IDT PCI to PCI Bridge and Proprietary Port Specific Registers Global Address Space Access Registers GASAADDR - Global Address Space Access Address (0xFF8) Field Default Type Description Field Name Value Reserved Reserved field. 18:2 GADDR Global Address. This field selects the system address of the reg- ister to be accessed via the GASADATA register.
Page 280 IDT PCI to PCI Bridge and Proprietary Port Specific Registers PES34H16G2 User Manual 16 - 72 April 5, 2013...
Page 281: Switch Configuration And Status Registers
Chapter 17 Switch Configuration and Status Registers ® Switch Control and Status Registers SWCTL - Switch Control (0x0000) Field Default Type Description Field Name Value Reserved Reserved field. RSTHALT HWINIT Reset Halt. When this bit is set, all of the switch logic except the SWSticky SMBus interface remains in a quasi-reset state.
Page 282 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value 10:9 DDDNC Disable Downstream Device Number Checking. This field con- SWSticky trols the extent to which device numbers are checked by down- stream ports. This field is present for backwards compatibility with earlier IDT switches that implement a proprietary version of ARI forwarding.
Page 283: Internal Switch Timer
IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value RSTHALT HWINIT Reset Halt. Boot configuration vector value sampled during a switch fundamental reset. 20:17 Reserved Reserved field. 23:21 CLKMODE HWINIT Clock Mode. Boot configuration vector value sampled during a switch fundamental reset.
Page 284: Switch Partition And Port Registers
IDT Switch Configuration and Status Registers Switch Partition and Port Registers SWPART[15:0]CTL - Switch Partition x Control Field Default Type Description Field Name Value STATE HWINIT Switch Partition State. This field controls the state of the switch SWSticky partition. 0x0 - (disable) Disabled 0x1 - (active) Active 0x2 - Reserved 0x3 - (reset) Reset...
Page 285 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value USID HWINIT Upstream Port ID. When the Upstream Port (US) bit is set in this register, this field specifies the switch port ID of the port that will act as the upstream port of the switch partition.
Page 286 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value Reserved Reserved field. Reserved HWINIT This field is unused in the switch and serves as a place holder for SWSticky the future. 21:20 Reserved HWINIT This field is unused in the switch and serves as a place holder for SWSticky the future.
Page 287: Protection
IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value 13:10 SWPART HWINIT Switch Partition. For operational port modes (i.e., downstream switch port, upstream switch port, NT endpoint, upstream switch port with NT endpoint), this field contains the current switch parti- tion to which the port is attached.
Page 288 IDT Switch Configuration and Status Registers S[15:0]CTL - SerDes x Control Field Default Type Description Field Name Value LANESEL 0x10 Lane Select. This field selects the lane on which the SerDes lane SWSticky control registers (S[x]TXLCTL0, S[x]TXLCTL1, S[x]RXLCTL, and S[x]RXEQLCTL) operate when written. 0x0 - Operate on lane 0 only 0x1 - Operate on lane 1 only 0x2 - Operate on lane 2 only...
Page 289 IDT Switch Configuration and Status Registers S[15:0]TXLCTL0 - SerDes x Transmitter Lane Control 0 Field Default Type Description Field Name Value CDC_FS3DBG1 Transmit Driver Coarse De-Emphasis Control for Full Swing SWSticky mode in Gen1. This field provides coarse level control of the trans- mit driver de-emphasis level in full-swing mode and Gen 1 data rate (i.e., 2.5 GT/s).
Page 290 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value 11:10 TX_EQ_3DBG2 Transmit Equalization for Full Swing Mode with -3.5dB in SWSticky Gen2. This field controls the transmit equalization in Gen 2 data rate, when the SDE field in the associated port’s PCIELCTL2 regis- ter is set to -3.5 dB de-emphasis.
Page 291 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value 25:23 TX_FSLEW_G2 Transmit Driver Fine Slew Adjustment in Gen2. This field allows SWSticky fine adjustment of the output driver’s slew rate at Gen 2 data-rate, for the lane(s) selected by the Lane Select (LANESEL[3:0]) field in the SerDes Control (S[x]CTL) register.
Page 292 IDT Switch Configuration and Status Registers S[15:0]TXLCTL1 - SerDes x Transmitter Lane Control 1 Field Default Type Description Field Name Value TDVL_FS3DBG1 0x11 Transmit Driver Voltage Level for Full-Swing Mode with -3.5dB SWSticky De-emphasis in Gen1. This field controls the SerDes transmit driver voltage level in full- swing mode and Gen 1 data rate (i.e., 2.5 GT/s).
Page 293 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value 15:13 FDC_FS3DBG2 Transmit Driver Fine De-emphasis Control for Full Swing SWSticky Mode with -3.5dB in Gen 2. This field provides fine level control of the transmit driver de- emphasis level in Gen 2 mode, when the SDE field in the associ- ated port’s PCIELCTL2 register is set to -3.5dB de-emphasis.
Page 294 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value 23:21 FDC_FS6DBG2 Transmit Driver Fine De-emphasis Control for Full Swing SWSticky Mode with -6.0dB in Gen 2. This field provides fine level control of the transmit driver de- emphasis level in Gen 2 mode, when the SDE field in the associ- ated port’s PCIELCTL2 register is set to -6.0dB de-emphasis.
Page 295: General Purpose I/O Registers
IDT Switch Configuration and Status Registers S[15:0]RXEQLCTL - SerDes x Receiver Equalization Lane Control Field Default Type Description Field Name Value RXEQZ Receiver Equalization Zero. Amplifies the high-frequency gain of SWSticky the equalizer. A value of 0x0 results in the smallest amount of high frequency gain.
Page 296 IDT Switch Configuration and Status Registers GPIOFUNC1 - General Purpose I/O Function 1 (0x0A94) Field Default Type Description Field Name Value 21:0 GPIOFUNC GPIO Function. Each bit in this field controls the corresponding SWSticky GPIO pin. When set, the corresponding GPIO pin operates as the selected alternate function.
Page 297 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value 27:26 AFSEL13 GPIO Pin 13 Alternate Function Select. See AFSEL0 field SWSticky description in the GPIOAFSEL0 register. 29:28 AFSEL14 GPIO Pin 14 Alternate Function Select. See AFSEL0 field SWSticky description in the GPIOAFSEL0 register.
Page 298 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value 31:30 AFSEL31 GPIO Pin 31 Alternate Function Select. See AFSEL0 field SWSticky description in the GPIOAFSEL0 register. GPIOCFG0 - General Purpose I/O Configuration 0 (0x0AA8) Field Default Type Description Field...
Page 299: Hot-Plug And Smbus Interface Registers
IDT Switch Configuration and Status Registers GPIOD1 - General Purpose I/O Data 1 (0x0AB4) Field Default Type Description Field Name Value 21:0 GPIOD HWINIT GPIO Data. Each bit in this field controls the corresponding GPIO SWSticky pin. Reading this field returns the current value of each GPIO pin regardless of GPIO pin mode (i.e., alternate function or GPIO pin).
Page 300 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value 24:20 HP4GPIOPRT 0x1F Hot-Plug GPIO 4 Port Map. This field selects the switch port SWSticky whose hot-plug signals are mapped to GPIO alternate function HP4 signals. A value of all ones (i.e., 0x1F) indicates that no port is mapped to HPx GPIO alternate function signals.
Page 301 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value MRLPWROFF MRL Automatic Power Off. When this bit is set and the Manual SWSticky Retention Latch Present (MRLP) bit is set in the PCI Express Slot Capability (PCIESCAP) register, then power to the slot is automat- ically turned off when the MRL sensor indicates that the MRL is open.
Page 302 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value BLANK RW1C Blank Serial EEPROM. When the switch is configured to operate in a mode in which serial EEPROM initialization occurs during a Switch Fundamental Reset, this bit is set when a blank serial EEPROM is detected.
Page 303 IDT Switch Configuration and Status Registers SMBUSCTL - SMBus Control (0x0ACC) Field Default Type Description Field Name Value 15:0 MSMBCP HWINIT Master SMBus Clock Prescalar. This field contains a clock pres- SWSticky calar value used during master SMBus transactions. The prescalar clock period is equal to 32 ns multiplied by the value in this field.
Page 304 IDT Switch Configuration and Status Registers EEPROMINTF - Serial EEPROM Interface (0x0AD0) Field Default Type Description Field Name Value 15:0 ADDR EEPROM Address. This field contains the byte address in the Serial EEPROM to be read or written. 23:16 DATA EEPROM Data.
Page 305 IDT Switch Configuration and Status Registers IOEXPADDR1 - SMBus I/O Expander Address 1 (0x0ADC) Field Default Type Description Field Name Value Reserved Reserved field. IOE4ADDR I/O Expander 4 Address. This field contains the SMBus address SWSticky assigned to I/O expander 4 on the master SMBus interface. Reserved Reserved field.
Page 306 IDT Switch Configuration and Status Registers Field Default Type Description Field Name Value Reserved Reserved field. 15:9 IOE13ADDR I/O Expander 13 Address. This field contains the SMBus address SWSticky assigned to I/O expander 13 on the master SMBus interface. 31:16 Reserved Reserved field.
Page 307: Jtag Boundary Scan
Chapter 18 JTAG Boundary Scan ® Introduction Notes The JTAG Boundary Scan interface provides a way to test the interconnections between integrated circuit pins after they have been assembled onto a circuit board. There are two pin types present in the switch: AC-coupled and DC-coupled (also called AC and DC pins).
Page 308: Table 18.1 Jtag Pin Descriptions
IDT JTAG Boundary Scan Notes Pin Name Type Description JTAG_TRST_N Input JTAG RESET (active low) Asynchronous reset for JTAG TAP controller (internal pull-up) JTAG_TCK Input JTAG Clock Test logic clock. JTAG_TMS and JTAG_TDI are sampled on the rising edge. JTAG_TDO is output on the falling edge. JTAG_TMS Input JTAG Mode Select.
Page 309: Boundary Scan Chain
IDT JTAG Boundary Scan Boundary Scan Chain Notes Function Pin Name Type Boundary Cell PCI Express Interface PE00RN[3:0] PE00RP[3:0] PE00TN[3:0] PE00TP[3:0] PE01RN[3:0] PE01RP[3:0] PE01TN[3:0] PE01TP[3:0] PE02RN[3:0] PE02RP[3:0] PE02TN[3:0] PE02TP[3:0] PE03RN[3:0] PE03RP[3:0] PE03TN[3:0] PE03TP[3:0] PE04RN[3:0] PE04RP[3:0] PE04TN[3:0] PE04TP[3:0] PE05RN[3:0] PE05RP[3:0] PE05TN[3:0] PE05TP[3:0] PE06RN[3:0] PE06RP[3:0]...
Page 310 IDT JTAG Boundary Scan Notes Function Pin Name Type Boundary Cell PCI Express PE09TN[3:0] Interface (Cont.) PE09TP[3:0] PE10RN[3:0] PE10RP[3:0] PE10TN[3:0] PE10TP[3:0] PE11RN[3:0] PE11RP[3:0] PE11TN[3:0] PE11TP[3:0] PE12RN[3:0] PE12RP[3:0] PE12TN[3:0] PE12TP[3:0] PE13RN[3:0] PE13RP[3:0] PE13TN[3:0] PE13TP[3:0] PE14RN[3:0] PE14RP[3:0] PE14TN[3:0] PE14TP[3:0] PE15RN[3:0] PE15RP[3:0] PE15TN[3:0] PE15TP[3:0] P[15:0]CLKN —...
Page 311 IDT JTAG Boundary Scan Notes Function Pin Name Type Boundary Cell System Pins CLKMODE[1:0] GCLKFSEL MSMBSMODE P01MERGEN P23MERGEN P45MERGEN P67MERGEN P89MERGEN P1011MERGEN P1213MERGEN P1415MERGEN PERSTN RSTHALT SWMODE[3:0] — EJTAG / JTAG JTAG_TCK — JTAG_TDI — JTAG_TDO — JTAG_TMS — JTAG_TRST_N —...
Page 312: Test Data Register (Dr)
IDT JTAG Boundary Scan Test Data Register (DR) Notes The Test Data register contains the following: Bypass register  Boundary Scan registers   Device ID register These registers are connected in parallel between a common serial input and a common serial data output and are described in the following sections.
Page 313: Figure 18.4 Diagram Of Output Cell
IDT JTAG Boundary Scan Notes EXTEST To Next Cell Data from Core To Output Pad Data from Previous Cell shift_dr clock_dr update_dr Figure 18.4 Diagram of Output Cell The output enable cells are also output cells. The simplified logic is shown in Figure 18.5. shift_dr EXTEST Output enable from core...
Page 314: Instruction Register (Ir)
IDT JTAG Boundary Scan Instruction Register (IR) Notes The Instruction register allows an instruction to be shifted serially into the device at the rising edge of JTAG_TCK. The instruction is then used to select the test to be performed or the test register to be accessed, or both.
Page 315: Sample/Preload
IDT JTAG Boundary Scan SAMPLE/PRELOAD Notes The sample/preload instruction has a dual use. The primary use of this instruction is for preloading the boundary scan register prior to enabling the EXTEST instruction. Failure to preload will result in unknown random data being driven onto the output pins when EXTEST is selected. The secondary function of SAMPLE/PRELOAD is for sampling the system state at a particular moment.
Page 316: Validate
IDT JTAG Boundary Scan VALIDATE Notes The VALIDATE instruction is automatically loaded into the instruction register whenever the TAP controller passes through the CAPTURE-IR state. The lower two bits ‘01’ are mandated by the IEEE Std. 1149.1 specification. EXTEST_TRAIN EXTEST_TRAIN instruction listed and explained in the IEEE 1149.6 JTAG specification. It is used to test AC pins during boundary scan by shifting data from TDI to TDO within the Shift-DR-TAP controller State.
Page 317 Renesas' products are provided only subject to Renesas' Terms and Conditions of Sale or other applicable terms agreed to in writing. No use of any Renesas resources expands or otherwise alters any applicable warranties or warranty disclaimers for these products.

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