Pci I/O Subsystem; 32-Bit, 33-Mhz Pci Subsystem; Device Ids (Idsel); Pci Arbitration - MAXDATA Fusion 6000 System Manual

PCI I/O Subsystem

The primary I/O bus for the MAXDATA
dent PCI bus. The PCI bus complies with the PCI Local Bus Specifi cation, Rev 2.2. The PCI
bus is directed through the Intel
the characteristics of the PCI bus.
Table 9. PCI Bus Characteristics
Voltage Width
5 V 32-bits

32-bit, 33-MHz PCI Subsystem

All 32-bit, 33-MHz PCI I/O for the MAXDATA Fusion 6000 System board is directed through
the Intel 82801BA I/O Controller Hub (ICH2). The PCI bus supports the following embedded
®
devices and connectors:
• 2D/3D Graphics Accelerator: ATI Rage XL Video Controller.
• Two 10/100 Network Interface Controllers: Intel
• ATA-100 controller: Promise Technology PDC20267.
• Two Ultra DMA 33 / ATA 66/100 connectors.
Each of the embedded devices listed above, with exception to the Ultra DMA 33 / ATA
66/100 connectors, will be allocated a GPIO to disable the device.

Device IDs (IDSEL)

Each device under the PCI hub bridge has its IDSEL signal connected to one bit of AD[31:16],
which acts as a chip select on the PCI bus segment in configuration cycles. This determines
a unique PCI device ID value for use in configuration cycles. The following table shows each
IDSEL value for the PCI bus devices and the corresponding device description.
Table 10. PCI Bus Configuration IDs
IDSEL Value
25
26
27
28
29
30
31

PCI Arbitration

The PCI bus supports six PCI masters (ATI Rage XL, two Intel
Controller, PCI connector 1 and an arbiter (PCI connector 2 and PCI connector 3). All PCI
masters must arbitrate for PCI access, using resources supplied by the ICH2. The host
bridge PCI interface (ICH2) arbitration lines REQx and GNTx are a special case in that they
are internal to the host bridge.
MAXDATA Fusion 6000
Fusion
82801BA I/O Controller Hub (ICH2). The table below lists
®
Speed
33 MHz
Device
PCI slot 1 (closest to AGP connector)
PCI slot 2 (middle slot)
PCI slot 3 (closest to left edge of board)
Intel 82550PM Fast Ethernet Controller
®
Intel 82550PM Fast Ethernet Controller
®
ATA-100 controller Promise Technology PDC20267
ATI Rage XL Video Controller
6000 System board is PCI, with one indepen-
Type
Independent Bus
82550PM Fast Ethernet Controller.
®
82550s, Promise ATA-100
®
Comments
Supports full-length
cards
25