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Advantech SOM-5780 Design Manual

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Advantech
SOM-Express
System On Module
Design Guide
Version 1.1

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Summary of Contents for Advantech SOM-5780

  • Page 1 Advantech SOM-Express System On Module Design Guide Version 1.1...
  • Page 2 Advantech SOM-Express Design Guide Notices The copyright on this user manual remains with Advantech Co., Ltd. No part of this user manual may be transmitted, reproduced, or changed. Other companies’ product names that may be used herein remain the property of their respective owners.

  • Page 3: Table Of Contents

    Table 2.4 SOM-5780 IRQ Resources..........19 Table 2.5 SOM-5780 DMA Resources ........19 Table 2.6 SOM-5780 Memory Map ..........20 Table 2.7 SOM-5780 I/O Map............21 Table 2.8 SOM-5780 Alternative Device Resources ....22 2.3.2 SOM-5782 Resources ..............22 Table 2.9 SOM-5782 IRQ Resources..........22 Table 2.10 SOM-5782 DMA Resources ........22 Table 2.11 SOM-5782 Memory Map ...........23...
  • Page 4 Advantech SOM-Express Design Guide 2.6.2 Universal Serial Bus (USB) AC Spec...........29 2.6.3 Audio AC Spec................29 2.6.4 VGA AC Spec................29 2.6.5 IDE AC Spec.................30 2.6.6 I2C AC Spec.................30 2.6.7 SMBus AC Spec................30 Chapter 3 Pin Assignments .................31 Table 3.1 Conventions and Terminology ........31...
  • Page 5 Advantech SOM-Express Design Guide Figure 5-10 Violation of Proper Routing Techniques....50 Figure 5-11 Creating Unnecessary Stubs........50 AC Link/Azalia interface ................51 5.3.1 Signal Description.................51 Table 5.10 Audio signals description ..........51 5.3.2 Design Guidelines.................51 Figure 5-12 AC link Connections ..........52 Figure 5-13 Azalia link Connections ..........52 Figure 5-14 AC link Audio Layout Guidelines .......53...
  • Page 6 Advantech SOM-Express Design Guide Figure 5-31 Bend example ............67 Figure 5-32 10/100M Ethernet Interconnection ......68 Figure 5-33 Gigabit Ethernet Interconnection.......68 Figure 5-34 Critical Dimensions............69 TV-Out ....................70 5.8.1 Signal Descriptions ...............70 Table 5.20 TV signals description..........70 5.8.2 Design Guidelines.................70 Figure 5-35 Connection of TV-out ..........70 Figure 5-36 TV DAC Video Filter ..........71...
  • Page 7 Figure 5-57 LPT Connection............90 Figure 5-58 Floppy Connection ............91 Chapter 6 Power Delivery Guidelines ..............92 SOM-Express Power Consumption............92 Table 6.1 SOM-5780 Power Consumption ........92 Design Guidelines .................95 6.2.1 ATX Power Delivery Block Diagram ..........95 Figure 6-1 ATX Power Delivery Block Diagram......95 6.2.2...
  • Page 8 Advantech SOM-Express Design Guide 8.8.3 Heat-Sink ..................107 Figure 8-8: Heatsink Dimensions..........107 Table 8.2: Chemistry Ingredient & Temper Designation.....108 8.8.4 Thermal Pad ................108 Figure 8-8: Thermal Pad.............108 Table 8.3 Thermal Pad ...............108 8.8.5 Screws 109 Table 8.4 Screws ................109 8.8.6 Table 8.5: Fan Characteristics............111...

  • Page 9: Chapter 1 Introduction

    Advantech SOM-Express Design Guide Chapter 1 Introduction This design guide organizes and provides Advantech’s SOM carrier board design recommendations for Advantech SOM-Express modules. It specifies common mechanical and electrical characteristics in order to ensure the carrier board design meets all the requirements needed to work properly.

  • Page 10: Referenced Documents

    Advantech SOM-Express Design Guide 1.2 Referenced Documents Table 1.2 Referenced Documents Document Location Advanced Configuration and Power http://www.acpi.info/spec.htm 3.0b Management (ACPI) Specification COM Express Specification http://www.picmg.org/ Ethernet(IEEE 802.3) http://www.ieee.org/portal/site I2C Bus Interface http://www.semiconductors.philips.com/ IrDA http://www.irda.org/ http://www.pcisig.com/ PC104 http://www.pc104.org/technology/pc104_tech.html RS232 http://www.eia.org/ SMBus http://www.smbus.org/specs/...

  • Page 11: Chapter 2 Som-Express Overview

    80%. 2.1 Overview Advantech offers a wide range of SOM products to cater to each customer's demands. The modular designs allow upgrade ability and add more flexibility to the system. The COM Express form factor allows the SOM-Express modules to be easily and securely mounted on a customized solution board.
  • Page 12 Advantech SOM-Express Design Guide Though small in size, SOM takes care of most complicated CPU architectures and basic common circuits. Many system integrators are finding an Advantech SOM solution already covers 80% of their feature requirements. This makes SOM a powerful time and money saver.

  • Page 13: Specifications

    Advantech SOM-Express Design Guide 2.2 Specifications Advantech provides two SOM-Express modules, and each module has a different CPU type for customer to choose. Table 2.1 shows Advantech SOM-Express modules with brief descriptions. Table 2.1 SOM-Express Module SOM-5780 Series Description SOM-5780FL-00A1E...

  • Page 14: Som-5780

    Advantech SOM-Express Design Guide 2.2.1 SOM-5780 Advantech’s new SOM-5780 is the ultimate powerful SOM-Express CPU module able to drive the most demanding embedded applications requiring high performance CPU processing power & graphics support. With support for Intel® Pentium® M and Celeron®...
  • Page 15 Intel Extreme Graphics 2 & PCI Express graphics Supports the upcoming primary datapath PCI Express Supports 8 host USB2.0 ports and 4 SATA Supports up to dual channel LVDS panels Table 2.2 SOM-5780 Specifications Item Description Embedded Intel Pentium M or Celeron M processor w/64KB...

  • Page 16: Som-5782

    Advantech SOM-Express Design Guide 2.2.2 SOM-5782 Figure 2-2 SOM-5782 Block Diagram Chapter 2 SOM-Express Overview...
  • Page 17 Advantech SOM-Express Design Guide SOM-5782 Main Features: 　 E mbedded Intel® Core™2 Duo / Core™ Duo / Celeron® M Processor 　 I ntel new graphics core based on GMA 950 & external PCI Express x 16 graphics interface. 　 S upports the upcoming primary datapath PCI Express 　...

  • Page 18: Som-Db5700

    Advantech SOM-Express Design Guide 2.2.3 SOM-DB5700 CD-IN ATX-POWER CENTER/LFE SURROUND SIDESURR HD Audio AC Link Codec ALC880 Primary IDE FRONT_OUT System Module LINE1/2_IN FDD(34P Standard) Super IO MIC1/2_IN USB 2.0 PO RT x 8 W83627HF COM-1 RS232 LAN RJ-45 (10/100 or Giga LAN)

  • Page 19: System Resources

    Advantech SOM-Express Design Guide 2.3 System Resources This section demonstrates resources distribution of Advantech’s SOM-Express modules, including IRQ, DMA, memory map, and I/O map. 2.3.1 SOM-5780 Resources Table 2.4 SOM-5780 IRQ Resources Description (ISA) System timer (ISA) Standard 101/102-Key or Microsoft Natural PS/2 Keyboard...
  • Page 20 Advantech SOM-Express Design Guide Table 2.6 SOM-5780 Memory Map Memory Address Description 00000000 - 0009FFFF System board 000A0000 - 000BFFFF PCI bus 000A0000 - 000BFFFF Intel(R) 82915GM Graphics Controller 000C0000 - 000DFFFF PCI bus 000E0000 - 000EFFFF System board 000F0000 - 000F3FFF...
  • Page 21 Advantech SOM-Express Design Guide Table 2.7 SOM-5780 I/O Map Memory Address Description 00000000 - 00000CF7 PCI bus 00000000 - 0000000F Direct memory access controller 00000010 - 0000001F Motherboard resources 00000020 - 00000021 Programmable interrupt controller 00000022 - 0000003F Motherboard resources...

  • Page 22: Som-5782 Resources

    Advantech SOM-Express Design Guide Table 2.8 SOM-5780 Alternative Device Resources Alternative Device Resources COM1 3F8/IRQ4*, 2F8/IRQ3, 3E8/IRQ4, 2E8/IRQ3, Disable COM2 3F8/IRQ4, 2F8/IRQ3*, 3E8/IRQ4, 2E8/IRQ3, Disable LPT1 378/IRQ7*, 278/IRQ5, 3BC/IRQ7, Disable * Default setting 2.3.2 SOM-5782 Resources Table 2.9 SOM-5782 IRQ Resources...
  • Page 23 Advantech SOM-Express Design Guide Table 2.11 SOM-5782 Memory Map Memory Address Description 0x0000-0x9FFFF System board 0x100000-0xF6DFFFF System board 0xA0000-0xBFFFF PCI bus 0xA0000-0xBFFFF Mobile Intel(R) 945GM Express Chipset Family 0xC0000-0xDFFFF PCI bus 0xCE600-0xCFFFF System board 0xD0000000-0xDFFFFFFF Mobile Intel(R) 945GM Express Chipset Family...
  • Page 24 Advantech SOM-Express Design Guide Table 2.12 SOM-5782 I/O Map Memory Address Description 0x0000-0x0CF7 PCI bus 0x0000-0x0CF7 Direct memory access controller 0x0010-0x001F Motherboard resources 0x0020-0x0021 Programmable interrupt controller 0x0022-0x003F Motherboard resources 0x0040-0x0043 System timer 0x0044-0x005F Motherboard resources 0x0060-0x0060 Standard 101/102-Key or Microsoft Natural PS/2 Keyboard...

  • Page 25: Pci Routing

    INTB# REQ5 GNT5 AD25 2.5 DC Specifications The Advantech’s SOM-Express modules power consumption properties have been measured and list in Table 6.1 2.5.1 Interface I/O Voltage 2.5.1.1 PCI Bus Table 2.15 DC specifications for 5V signaling of PCI Bus Symbol...
  • Page 26 Advantech SOM-Express Design Guide Table 2.16 DC specifications for 3.3V signaling of PCI Bus Symbol Parameter Units Note Supply Voltage Input High Voltage 0.5Vcc Vcc+0.5 Input Low Voltage -0.5 0.3Vcc Vipu Input Pull-up Voltage 0.7Vcc Output High Voltage 0.9Vcc Output Low Voltage 0.1Vcc...
  • Page 27 Advantech SOM-Express Design Guide 2.5.1.2 Universal Serial Bus (USB) Table 2.17 DC specification of USB signals Symbol Parameter Unit Note High-power port supply voltage 4.75 5.25 Low-power port supply voltage 4.75 5.25 Input Low Voltage Input High Voltage(driven) Input High Voltage(floating)
  • Page 28 Advantech SOM-Express Design Guide 2.5.1.5 LCD Table 2.22 LCD I/O Voltage Symbol Parameter Unit Note Input Low Voltage -0.5 Input High Voltage Vcc+0.5 Output Low Voltage 0.55 Iol=4.0mA Output High Voltage Ioh=-1.0mA 2.5.1.6 IDE Table 2.23 Ultra DMA modes 1-4 (5V)

  • Page 29: Ac Specification

    Advantech SOM-Express Design Guide *1. From ”Infrared Data Association – Infrared Dongle Interface v1.1” *2. Vcc=5.0V±5% 2.5.1.10 Table 2.28 I2C I/O Voltage Symbol Parameter Unit Note Input Low -0.5 0.3Vdd Voltage Input High 0.7Vdd Vdd+0.5 Voltage Output Low Voltage *1. The I2C Bus Specification V2.1.

  • Page 30: Ide Ac Spec

    Advantech SOM-Express Design Guide 2.6.5 IDE AC Spec. Please refer to “Information Technology - AT Attachment with Packet Interface – 7 Volume 2 (ATA/ATAPI-7 V2)” Annex B.5 for the details 2.6.6 I2C AC Spec. Please refer to “THE I 2C-BUS SPECIFICATION VERSION 2.1 JANUARY 2000” for the DAC AC Characteristics 2.6.7 SMBus AC Spec.

  • Page 31: Chapter 3 Pin Assignments

    Advantech SOM-Express Design Guide Chapter 3 Pin Assignments This chapter describes pin assignments and IO characteristics for the 440 pin SOM- Express. It includes four parts (A, B, C, D). There are five types of pin assignments for COM-Express. We chose type-2 pin assignments on the SOM-Express. Please refer to the COM-Express specifications to get more information.

  • Page 32: Row A

    Advantech SOM-Express Design Guide 3.1 Row A Table 3.2 Connector A Pin Assignments Signal Signal GND (FIXED) PCIE_TX4- PCIE AC on GBE0_MDI3- VSB3 GBE0_MDI3+ PCIE_TX3+ VSB3 PCIE AC on GBE0_LINK100# PCIE_TX3- VSB3 PCIE AC on GBE0_LINK1000# GND (FIXED) VSB3 GBE0_MDI2-...

  • Page 33: Row B

    Advantech SOM-Express Design Guide 3.2 Row B Table 3.3 Connector B Pin Assignments Signal Signal GND (FIXED) PWR* PCIE_RX4- PCIE AC off GBE0_ACT# VSB3 GPO2 MISC VCC3 LPC_FRAME# VCC3 PCIE_RX3+ PCIE AC off LPC_AD0 VCC3 PCIE_RX3- PCIE AC off LPC_AD1...

  • Page 34: Row C

    Advantech SOM-Express Design Guide 3.3 Row C Table 3.4 Connector C Pin Assignments Signal Signal GND (FIXED) PWR* PEG_RX1- PCIE AC off IDE_D7 VCC3/5 TYPE1# MISC IDE_D6 VCC3/5 PEG_RX2+ PCIE AC off IDE_D3 VCC3/5 PEG_RX2- PCIE AC off IDE_D15 VCC3/5...

  • Page 35: Row D

    Advantech SOM-Express Design Guide 3.4 Row D Table 3.5 Connector D Pin Assignments Signal Signal GND (FIXED) PWR* PEG_TX1- PCIE IDE_D5 VCC3/5 TYPE2# MISC IDE_D10 VCC3/5 PEG_TX2+ PCIE AC on IDE_D11 VCC3/5 PEG_TX2- PCIE AC on IDE_D12 VCC3/5 GND (FIXED)

  • Page 36: Chapter 4 General Design Recommendations

    Advantech SOM-Express Design Guide Chapter 4 General Design Recommendations A brief description of the Printed Circuit Board (PCB) for SOM-Express based boards is provided in this section. From a cost- effectiveness point of view, a four-layer board is the target platform for the motherboard design. For better quality, a six-layer or 8- layer board is preferred.

  • Page 37: Four Layer Board Stack-Up

    Advantech SOM-Express Design Guide 4.1.1 Four layer board stack-up Figure 4-1 illustrates an example of a four-layer stack-up with 2 signal layers and 2 power planes. The two power planes are the power layer and the ground layer. The layer sequence of component-ground-power-solder is the most common stack-up arrangement from top to bottom.

  • Page 38: Six Layer Board Stack-Up

    Advantech SOM-Express Design Guide 4.1.2 Six layer board stack-up Figure 4-2 illustrates an example of a six-layer stack-up with 4 signal layers and 2 power planes. The two power planes are the power layer and the ground layer. The layer sequence of component-ground-IN1-IN2-power-solder is the most common stack-up arrangement from top to bottom.

  • Page 39: Differential Impedance Targets For Microstrip Routing

    Advantech SOM-Express Design Guide 4.2 Differential Impedance Targets for Microstrip Routing Table 4.3 shows the target impedance of the differential signals. The carrier board should follow the required impedance in this table. Table 4.3 Differential Signals Impedance Requirement Signal Type...

  • Page 40: Chapter 5 Carrier Board Design Guidelines

    Advantech SOM-Express Design Guide Chapter 5 Carrier Board Design Guidelines 5.1 PCI-Bus SOM-Express provides a PCI Bus interface that is compliant with the PCI Local Bus Specification, Revision 2.3. The implementation is optimized for high-performance data streaming when SOM-Express is acting as either the target or the initiator on the PCI bus.

  • Page 41: Design Guidelines

    Advantech SOM-Express Design Guide 5.1.2 Design Guidelines 5.1.2.1 Differences among PCI Slots Most PCI signals are connected in parallel to all the slots (or devices). The exceptions are the following pins from each slot or device: Table 5.2 Carrier PCI Slots IDSEL : Connected (through resistor) to a different AD line for each slot.
  • Page 42 Advantech SOM-Express Design Guide SOM-Express Module AD23 Pin C43 Pin D40 AD22 AD21 Pin C42 AD20 Pin D39 INTA# Pin C49 PCI Slot / Device 0 PCI Slot / Device 1 PCI Slot / Device 2 PCI Slot / Device 3...
  • Page 43 Advantech SOM-Express Design Guide Vtest CLK (Device 1) Tskew Tskew Tskew Vtest CLK (Device 2) Figure 5-2 Clock Skew Diagram 5.1.2.3 Non-necessary Signals for Individual PCI device A PCI device implemented directly on the carrier board uses a subset of the signals shown on the slot connector.

  • Page 44: Layout Guidelines

    If a universal connector is used, make sure the Vio jumper setting is correct when plugged into the riser card. 2. Advantech’s demo carrier board provides a 5 V connector and 5 V Vio for PCI slots. Plugging a 3.3 V riser card in the wrong direction will cause carrier board or riser card damage.
  • Page 45 Advantech SOM-Express Design Guide Table 5.7 PCI Data Signals Routing Summary Trace PCI Routing Requirements Topology Maximum Trace Length Impedance (unit: inch) 2 Slots W1 = W2 = 0.5 55 Ω 6 mils width, 6 mils spacing (based inches, +/- 10%...

  • Page 46: Application Notes

    Advantech SOM-Express Design Guide 5.1.4 Application Notes 5.1.4.1 REQ/GNT These signals are used only by bus-mastering PCI devices. Most SOM-Express modules do not have enough REQ/GNT pairs available to support a bus-mastering device at every slot position. A PCI arbiter design is recommended when extra REQ/GNT pairs are required.

  • Page 47: Universal Serial Bus (Usb)

    Advantech SOM-Express Design Guide 5.2 Universal Serial Bus (USB) The Universal Serial Bus (USB) provides a bi-directional, isochronous, hot-attachable Plug and Play serial interface for adding external peripheral devices such as game controllers, communication devices and input devices on a single bus. SOM-Express modules provide several USB 2.0 ports.

  • Page 48: Layout Guideline

    Advantech SOM-Express Design Guide 5.2.2.1 Low ESR Capacitor You can hot plug USB devices. In fact, this is one of the virtues of USB relative to most other PC interfaces. The design of the USB power-decoupling network must absorb the momentary current surge from hot plugging an unpowered device.
  • Page 49 Advantech SOM-Express Design Guide usually allows determining the correct trace width and spacing to achieve this impedance, after the PCB stack-up configuration is known. As per usual differential pair routing practices, the two traces of each USB pair should be matched in length and kept at uniform spacing. Sharp corners should be avoided.
  • Page 50 Advantech SOM-Express Design Guide 5.2.3.3 Crossing a plane split The mistake shown here is where the data lines cross a plane split. This causes unpredictable return path currents and would likely cause a signal quality failure as well as creating EMI problems.

  • Page 51: Ac Link/Azalia Interface

    Advantech SOM-Express Design Guide 5.3 AC Link/Azalia interface SOM-Express provides an AC Link/Azalia interface which is compliant to AC’97 Rev. 2.3 Specification and the Azalia Specification. Please establish the AC’97/Azalia CODEC on the carrier board for your application. 5.3.1 Signal Description Table 5.10 shows SOM-Express AC Link/Azalia interface signals, including pin...
  • Page 52 Advantech SOM-Express Design Guide AC/MC/AMC AC_RST# SOM-Express AC_SDOUT Primary AC_SYNC Codec AC_BITCLK AC_SDIN[0] AC_SDIN[1] AC_SDIN[2] AC/MC/AMC Secondary Codec AC/MC/AMC Tertiary Codec Figure 5-12 AC link Connections 5.3.2.3 Azalia: Figure 5-13 shows the connections for SOM-Express Azalia signals. Azalia clocking is provided from SOM-Express via AC_BITCLK. AC_BITCLK is a 24.000 MHz clock...
  • Page 53 Advantech SOM-Express Design Guide 5.3.2.5 Grounding Techniques Take care when grounding back panel audio jacks, especially the line in and microphone jacks. Avoid grounding the audio jacks to the ground plane directly under the connectors. Doing so raises the potential for audio noise to be induced on the inputs due to the difference in ground potential between the audio jacks and the codec’s ground point.

  • Page 54: Layout Guidelines

    Advantech SOM-Express Design Guide 5.3.3 Layout Guidelines 5.3.3.1 General Board Routing Recommendations Special consideration must be given for the ground return paths for the analog signals. Digital signals routed in the vicinity of the analog audio signals must not cross the power plane split.

  • Page 55: Ac_Sdout/Ac_Sync/Ac_Bitclk/Ac_Rst# Topology#1

    Advantech SOM-Express Design Guide Carrier board Audio Codec (down) Modem SOM-Express Codec Audio Codec Dock Figure 5-17 Azalia – AC_SDOUT/AC_SYNC/AC_BITCLK/AC_RST# Topology#1 Table 5.12 Azalia – AC_SDOUT/AC_SYNC/AC_ BITCLK/AC_RST# Topology #1 Trace Azalia Requirements Trace Series Signal Impedance length Termination Length Resistance Matching 55 Ω...

  • Page 56: Bitclk/Ac_Rst# Topology #2

    Advantech SOM-Express Design Guide Table 5.13 Azalia – AC_SDOUT/AC_SYNC/AC_ BITCLK/AC_RST# Topology #2 Trace Azalia Requirements Trace Series Signal Impedance length Termination Length Resistance Matching 55 Ω 4 on 7 (stripline) L1= 0.5“ R1= 39 Ω +/- 15% 5 on 7 (microstrip) L2≤...

  • Page 57: Design Guidelines

    Advantech SOM-Express Design Guide 5.4.2 Design Guidelines VESA standards require the DDC_PWR line. Some VGA monitors do not support the DDC standard. We suggest that VGA_I2C_CK and VGA_I2C_DAT signals must connect to the CRT monitor. They can be used for plug and play and monitor-type detection when standard monitors are attached.
  • Page 58 Advantech SOM-Express Design Guide 5.4.3.2 RGB Output Current Balance Path Analog R, G and B (red, green and blue) traces should be designed to be as short as possible. Careful design, however, will allow considerable trace lengths with no visible artifacts. GNDRGB is an "analog current balance path" for the RGB lines. In...

  • Page 59: Lvds

    Advantech SOM-Express Design Guide 5.5 LVDS 5.5.1 Signal Description Table 5-15 shows SOM-Express LVDS signals, including pin number, signals, I/0 and descriptions. Table 5-15 LVDS signals description Signal Description A71,73,75,78 LVDS_A[0:3]+ LVDS Channel A differential pairs A72,74,76,79 LVDS_A[0:3]- LVDS_A_CK+ LVDS Channel A differential clock...

  • Page 60: Layout Requirements

    Advantech SOM-Express Design Guide Table 5-16 LVDS Signals Trace Length Mismatch Mapping Clocks Data To Signal Associated Clock Associated Siganl group Data Pair matching with the Matching Clock channel Matching LVDS_A[0]+ ±10 mils LVDS_A[0]- CHANNEL A LVDS_A[1]+ ±10 mils LVDS_A_CK+ ±10 mils...

  • Page 61: Primary Ide0

    Advantech SOM-Express Design Guide 5.6 Primary IDE0 SOM-Express provides one IDE interface. 5.6.1 Signal Description Table 5-17 shows SOM-Express IDE signals, including pin number, signals, I/0 and descriptions. Table 5-17 IDE signals description Signal Description IDE_D[0..15] Bidirectional data to/from IDE device D13,14,15 IDE_A[0..2]...
  • Page 62 Advantech SOM-Express Design Guide Figure 5-24 IDE Master/Slave Handshake Signals Connection 5.6.2.2 UDMA Support Some SOM-Express modules support UDMA 33 data transfer mode. If an advanced IDE data transfer mode such as UDMA 66 is required, it requires a special 80- conductor IDE cable for signal integrity.

  • Page 63: Layout Guidelines

    Advantech SOM-Express Design Guide SOM-ETX IDE _ D[0 : 15 ] IDE _ A [ 0 : 2 ] IDE _ CS # 1 IDE _ CS # 3 IDE _ IOR # IDE _ IOW# IDE _ REQ Connector...

  • Page 64: Ethernet

    Advantech SOM-Express Design Guide 5.7 Ethernet SOM-Express supports the IEEE802.3 network interface and flexible dynamically loadable EEPROM algorithm. The network interface complies with the IEEE standard for 10BASE-T, 100BASE-T and 1000BASE-T Ethernet interfaces. 5.7.1 Signal Descriptions Table 5-19 shows SOM-Express Ethernet signals, including pin number, signals, I/0, power plane and descriptions.
  • Page 65 Advantech SOM-Express Design Guide Figure 5-27 and Figure 5-28 shows the 10/100M Ethernet and Gigabit Ethernet Connections. Figure 5-27 10/100M Ethernet Connections LAN Connector SOM- Express GBE0_MDI[0]+ GBE0_MDI[0]- GBE0_MDI[1]+ Magnetic GBE0_MDI[1]- Module GBE0_MDI[2]+ (Transformer) RJ45 GBE0_MDI[2]- GBE0_MDI[3]+ GBE0_MDI[3]- GBE0_ACT# GBE0_LINK#...

  • Page 66: Layout Guidelines

    Advantech SOM-Express Design Guide 5.7.2.3 Implementation of indicators Some RJ-45 include LEDs which need 3.3 volts to drive the link and action LEDs, so we need to provide 3.3 volts on the carrier board. Link and activity LEDs can be implemented by using the SOM-Express module’s GBE0_ACT#, GBE0_LINK#,...
  • Page 67 Advantech SOM-Express Design Guide Carrier board SOM-Express Differential Pairs Transformer On board chip Differential Pairs Figure 5-30 Differential signals route example Figure 5-31 Bend example 5.7.3.2 Transformer We recommend using the integrated Magnetic Modules/RJ-45 connectors. If using the discrete Magnetic Modules and RJ-45 connector, the transformer should be placed close to the RJ-45 connector to limit EMI emissions.
  • Page 68 Advantech SOM-Express Design Guide Figure 5-32 10/100M Ethernet Interconnection Figure 5-33 Gigabit Ethernet Interconnection 5.7.3.3 Critical Dimensions There are two critical dimensions that must be considered during the layout phase of an Ethernet controller. These dimensions are identified in Figure 5-34 as A and B.
  • Page 69 Advantech SOM-Express Design Guide 1. Differential Impedance: The differential impedance should be 100 Ω. The single ended trace impedance will be approximately 50 Ω; however, the differential impedance can also be affected by the spacing between the traces. 2. Trace Symmetry: Differential pairs should be routed with consistent separation and with exactly the same lengths and physical dimensions (for example, width).

  • Page 70: Tv-Out

    Advantech SOM-Express Design Guide 5.8 TV-Out The TV-out display (TV DAC) interface consists of 3 outputs which can be used in different combinations to support component video, S-video or composite video. 5.8.1 Signal Descriptions Table 5.20 TV signals description Signal...

  • Page 71: Layout Guidelines

    Advantech SOM-Express Design Guide 5.8.2.2 ESD diode ESD diodes are required for each TV DAC channel output. The diodes should connect between the 3.3 V power plane (from the regulator) and ground. These diodes should have a low C rating (~ 5 pF max) and a small leakage current (~ 10 uA at 120℃).The diodes should be placed to keep the inductance of the 3.3 V power rail...

  • Page 72: Miscellaneous

    Advantech SOM-Express Design Guide Carrier board SOM-Express 3.3 V Spacing MAX=0.5" >50 mils TV_DAC_A MAX=0.2" Video Zo=50O Filter 150ohm Spacing Zo=75O 3.3 V >40 mils 150ohm MAX=0.5" 75 Ohm Coaxial Cable TV_DAC_B Video Zo=50O MAX=0.2" Connector Chipset Filter Spacing 150ohm Zo=75O 3.3 V...
  • Page 73 Advantech SOM-Express Design Guide TYPE2# TYPE1# TYPE0# Pin-Out Type 1 Pin-Out Type 2 Pin-Out Type 3 (no IDE) Pin-Out Type 4 (no PCI) Pin-Out Type 5 (no IDE,PCI) The Carrier Board should implement combinatorial logic that monitors the module TYPE pins and keeps power off (e.g.

  • Page 74: I2C Bus

    Advantech SOM-Express Design Guide The SPKR output from the SOM-Express module is a CMOS level signal. It can control an external FET or logic gate that drives an external PC speaker. The SOM- Express modules SPKR output should not be directly connected to either a pull-up or a pull-down resistor.

  • Page 75: Power Good/Reset Input

    Advantech SOM-Express Design Guide Carrier board SOM-Express SMB_CLK SMB_DAT Connecto Figure 5-40 SMB Bus Connections 5.9.4 Power Good/Reset Input The SOM-Express Power OK Input (PWR_OK) may be attached to an external power good circuit if desired, or used as a manual reset input by grounding the pin with a momentary-contact pushbutton switch.
  • Page 76 Advantech SOM-Express Design Guide Carrier SOM- board Express Power monitor WDT# Header Figure 5-42 Example of a watch-dog circuit Chapter 5 Carrier Board Design Guidelines...

  • Page 77: Pci Express Bus

    Advantech SOM-Express Design Guide 5.10 PCI Express Bus SOM-Express provides a PCI Express Bus interface that is compliant with the PCI Express Base Specification, Revision 1.0a. It supports several general purpose PCI Express port (x1) and external graphics using PCI Express architecture (x16). For...

  • Page 78: Design Guidelines

    Advantech SOM-Express Design Guide 5.10.2 Design Guidelines 5.10.2.1 PCI Express AC Coupling Capacitor Each PCI Express lane is AC coupled between its corresponding transmitter (TX) and receiver (RX). Figure 5-43 shows the connection for SOM-Express PCI Express signals. It is best to place AC coupling capacitors close to the transmitter (TX) of the SOM-Express board.
  • Page 79 Advantech SOM-Express Design Guide in scenarios #1 and #3. The specification does not include any provisions to address scenario #2 Polarity Inversion The PCI Express spec requires polarity inversion to be supported independently by all receivers across the link, i.e. the positive signal from the transmitter (TX+) can connect to the negative signal of the receiver (RX-) in the same lane.
  • Page 80 Advantech SOM-Express Design Guide 5.10.2.3 Terminating Unused PCI Express Ports If a PCI Express port will not be implement on the platform, the PCIE _TX+/-[x] and PCIE_RX+/-[x] signals may be left as No Connects. Note: Where “x” is the port number left as No Connect.

  • Page 81: Layout Guidelines

    Advantech SOM-Express Design Guide 5.10.3 Layout Guidelines The following represents a summary of the layout and routing guideline. 5.10.3.1 Differential pairs The PCI Express signals should be routed as differential pairs. The following is a summary of general routing guidelines for the differential pair traces.
  • Page 82 Advantech SOM-Express Design Guide 5.10.3.2 Board Stack-up Considerations Table 5-27 shows the PCI Express Trace Width and Spacing for Micro-strip and Strip- line base on the six layer board stack-up. Please refer to chapter 4 to get more information. Keep the required impedance based on the different board stack-up.
  • Page 83 Advantech SOM-Express Design Guide SOM-Express Express Device Figure 5-49 Topology #1 – SOM Express to PCI Express Device Down Table 5-28 SOM Express to PCI Express Capacitor Value Max = 14.75 inches Min = 0.25 inches Max = 14.75 75 nF to 200 nF, Max = 14.5 inches...

  • Page 84: Serial Ata

    Advantech SOM-Express Design Guide 5.11 Serial ATA SOM-Express provides up to four Serial ATA (SATA) interface. 5.11.1 Signal Description Table 5-30 shows SOM-Express Serial ATA signals for general purpose, including pin number, signals, I/0, and descriptions. Table 5-30 Serial ATA Signal Description...

  • Page 85: Layout Guidelines

    Advantech SOM-Express Design Guide 5.11.2.2 Indicated LED Implementation SOM-Express provides a signal (ATA_ACT#) to indicate SATA activity. In order for this signal to work in conjunction with Parallel ATA hard drives, it is recommended that designers implement glue logic. An example is shown in the Figure 5-52.
  • Page 86 Advantech SOM-Express Design Guide directly to a mobile SATA connector, we recommend the trace length be 9.5 inches for microstrip routing and 7 inches for stripline routing. The SATA differential pair trace should be trace length matched. The difference of two line traces in a TX or RX differential pair should be restricted to less than 20 mils, but even less trace mismatch is encouraged.

  • Page 87: Lpc

    Advantech SOM-Express Design Guide 5.12 LPC SOM-Express provides a LPC interface to some devices like Super I/O , FWH and others. 5.12.1 Signal Description Table 5-32 shows SOM-Express LPC signals, including pin number, signals, I/0 and descriptions. Table 5-32 LPC signals description...

  • Page 88: Application Notes

    Advantech SOM-Express Design Guide 5.12.4 Application Notes Some signals from the Super I/O, like Serial port, Parallel port, Floppy, IR, KBC, etc., can connect to SOM-Express via the LPC Bus. Figure 5-54 shows the architecture of the LPC interface. We will make some examples. You can get more information in the Super I/O data sheet.
  • Page 89 Advantech SOM-Express Design Guide Keyboard Connector 1A Trace Wide Mini-dim 6P Ferrite SOM- Super Fuse 1A Bead Express LPC_AD[0] LPC_AD[1] LPC_AD[2] LPC_AD[3] KBDAT LPC_FRAME# KB_DAT LPC_DRQ[0] KB_CLK KBCLK LPC_DRQ[1] LPC_SERIRQ LPC_CLK Digital Ground Chassis Ground Mouse Connector 1A Trace Wide...
  • Page 90 Advantech SOM-Express Design Guide 5.12.4.5 ESD Protection The PCB must incorporate protection against electrostatic discharge (ESD) events that might enter at I/O signal and electrical connection points. The goal is to prevent component or system failures due to externally sourced ESD impulses that may be propagated through both radiated and conducted mechanisms.
  • Page 91 Advantech SOM-Express Design Guide Floppy 1k ohm Route to Minimum SOM- Index# Express Track# LPC_AD[0] Write Protect# LPC_AD[1] Read Data LPC_AD[2] LPC_AD[3] Diskette Change# LPC_FRAME# LPC_DRQ[0] Super I/O Motor on 0 LPC_DRQ[1] Drive Select A# LPC_SERIRQ Drive Density Select# LPC_CLK...

  • Page 92: Chapter 6 Power Delivery Guidelines

    The power consumption of each SOM-Express module is shown below. The power consumption for different SOM-Express module power requirements will be necessary. Table 6.1 SOM-5780 Power Consumption SOM-5780 A1013 CPU : CPU760 2.0GHz, Memory : Transcend DDRII 533 1GB +5VSB(A) +12V(A) Watts BIOS(1 min) 0.31...
  • Page 93 Advantech SOM-Express Design Guide SOM-5780 A1013 CPU : CPU373 1.0GHz, Memory : Transcend DDRII 533 1GB +5VSB(A) +12V(A) Watts BIOS(1 min) 0.33 19.65 XP IDLE (1 min) 0.32 1.25 16.6 XP Standby(S1)(1 min) 0.32 1.07 14.44 XP Standby(S3)(1 min) 0.43 2.15...
  • Page 94 Advantech SOM-Express Design Guide 5VSB power 0.24 SOM-5782 A1011 CPU : CPU T2600 2.16GHz Memory : Transcend DDRII 667 1GB +V5SB(A) +V12(A) Watt BIOS(1 min) 0.24 2.02 25.44 XP IDLE (1 min) 0.25 1.57 20.09 XP Standby(S1)(1 0.22 17.9 min) XP Standby(S3)(1 0.39...

  • Page 95: Design Guidelines

    Advantech SOM-Express Design Guide 6.2 Design Guidelines 6.2.1 ATX Power Delivery Block Diagram An ATX power source will provide 12 V , -12 V , 5 V , -5 V , 3.3 V , 5 VSBY power , if other voltage is required (3.3 VSBY , LAN 2.5…. ) on the carrier board, an additional switching regulator or LDO will be necessary.

  • Page 96: At Power Delivery Block Diagram

    Advantech SOM-Express Design Guide 6.2.2 AT Power Delivery Block Diagram An AT power source will provide 12 V and 5 V power. An additional switching regulator or LDO will be required to simulate the ATX power (3.3 V…) .There will be no standby voltage when an AT power source is used.

  • Page 97: Chapter 7 Carrier Board Mechanical Design Guidelines

    Advantech SOM-Express Design Guide Chapter 7 Carrier Board Mechanical Design Guidelines 7.1 SOM-Express Mechanical Dimensions The PCB size of the SOM-Express module is 125mm x 95mm, COM Express Basic Module. The PCB thickness may be 2mm to allow high layer count stack-ups and facilitate a standard ‘z’...

  • Page 98: Som Express Module Connector

    Advantech SOM-Express Design Guide 7.2 SOM Express Module Connector The module connector for Pin-out Type 2 shall be a 440-pin receptacle that is composed of 2 pieces of a 220-pin, 0.5 mm pitch receptacle. The pair of connectors may be held together by a plastic carrier during assembly to allow handling by automated assembly equipment.

  • Page 99: Som Express Connector Pcb Pattern

    Advantech SOM-Express Design Guide A source for the individual 8mm stack height 220-piin plug is AMP / Tyco 3-1318491- 6 0.5mm pitch Free Height 220 pin 8H Plug, or equivalent, AMP / Tyco 8-1318491-6 0.5mm pitch Free Height 220 pin 8H Plug, or equivalent (same as previous part, but...

  • Page 100: Som Express Module Connector Pin Numbering

    Advantech SOM-Express Design Guide 7.5 SOM Express Module Connector Pin Numbering Pin numbering for 440-pin module receptacle. This is a top view of the receptacle, looking into the receptacle, as mounted on the backside of the module. Figure 7-5: SOM-Express Module Connector Pin Numbering 7.6 SOM-Express Carrier Board Connector Pin Numbering...

  • Page 101: Chapter 8 Heatsink Recommended Design

    Advantech SOM-Express Design Guide Chapter 8 Heatsink Recommended Design 8.1 Material of Heatsink The thermal conductivity of the heatsink's material has a major impact on cooling performance. Thermal conductivity is measured in W/mK; higher values mean better conductivity. As a rule of thumb, materials with a high electrical conductivity also have a high thermal conductivity.

  • Page 102: Attachment Method Of Thermal Solution

    8.4 Grounding Issues The mounting holes on all Advantech SOM-Express are connected to digital circuit ground (GND) for improved EMC performance. Using conductive screws and distance keepers will also connect the heat spreader and attached heat sink to GND.

  • Page 103: Som-Express Thermal Solution Specification

    Advantech SOM-Express Design Guide Air flow Air flow (b) Side View (a ) Top View Figure 8-2: Air Flow Direction 8.6 SOM-Express Thermal solution Specification Module should be equipped with a heat-spreader. This heat-spreader by itself does not constitute the complete thermal solution for a module but provides a common interface between modules and implementation-specific thermal solutions.
  • Page 104 Advantech SOM-Express Design Guide Tolerances (unless otherwise specified): Z (height) dimensions should be ±0.8mm [±0.031”] from top of Carrier Board to top of heat-spreader. Heat-spreader surface should be flat within 0.2mm [.008”] after assembly. Interface surface finish should have a maximum roughness average (Ra) of 1.6μ...

  • Page 105: Component Height - Module Back And Carrier Board Top

    Advantech SOM-Express Design Guide Figure 8-4: SOM-Express Module Heat-Spreader The interior holes at coordinates (40, 40) and (80, 40) are tapped through holes with a M2.5 thread. The interior holes do not receive standoffs. These holes may be sealed on the module side by an adhesive backed foil, or they may be blind tapped holes with a minimum thread depth of 2.5mm.

  • Page 106: Advantech Heatsink Information

    Advantech SOM-Express Design Guide 8.8 Advantech Heatsink Information 8.8.1 Vendor List Table 8.1: Vendor list Aluminum Extruded Heat-Spreader/Heat-Sink, Reference No. EID –BAN15-ALX- 003SS and EID-LPT13-ALX-003 CoolerMaster* Passive Heat-Spreader (includes heat-spreader, mounting clip, thermal interface material, retention mechanism, backplate, and five mounting screw)
  • Page 107 Advantech SOM-Express Design Guide Figure 8-7: SOM-Express Heat-Spreader Tolerances 8.8.3 Heat-Sink Figure 8-8: Heatsink Dimensions Chapter 8 Heat Sink Recommended Design...
  • Page 108 Advantech SOM-Express Design Guide Table 8.2: Chemistry Ingredient & Temper Designation Mechanical Characteristics Alloy No. Designation Cutting Area Surface Extension Rate 6063 Over 15kgf/ ㎜x㎜ Chemistry Ingredient & Temper Designation Value Flatness SPECIFIED 0.4258 0.2037 0.0032 0.0059 0.0028 0.5147 0.0000 0.00263...
  • Page 109 Advantech SOM-Express Design Guide 8.8.5 Screws Table 8.4 Screws Specification Quantity M2.5*6 M2.5*16 Chapter 8 Heat Sink Recommended Design...
  • Page 110 Advantech SOM-Express Design Guide 8.8.6 Fan Figure 8-8: Fan Chapter 8 Heat Sink Recommended Design...
  • Page 111 Advantech SOM-Express Design Guide Table 8.5: Fan Characteristics Chapter 8 Heat Sink Recommended Design...
  • Page 112 Advantech SOM-Express Design Guide Chapter 8 Heat Sink Recommended Design...

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