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Baseboard PCI I/O Subsystem Intel® SHG2 DP Server Board Technical Product Specification

Intel Order Number C11343-001 Revision 1.0

3. Baseboard PCI I/O Subsystem

3.1 Overview

The I/O buses for the Intel SHG2 server board are both PCI-X and PCI, with one PCI and two

PCI-X bus segments or peers. All the PCI (-X) buses comply with the PCI Local Bus

Specification, Revision 2.2 and PCI-X Specification, Revision 1.0a. All three 64-bit slots on

SHG2 are capable of supporting PCI-X mode (note: the 7899 on-board SCSI adapter must be

disabled in BIOS Setup to enable PCIX-6 support of PCI-X mode). Table 9 lists the

characteristics of the three PCI (-X) bus segments.

Table 9. PCI(-X) Bus Segment Characteristics

PCI Bus

Segment

Width Speed Type Add-in PCI Slot Support,

Total Eight Slots

64/100MHz 64 bit 100MHz PCI-X 2 slots (64-bit/100-MHz)

Full-length cards supported

64/133MHz 64 bit 133 MHz PCI-X 1 slots (64-bit/133-MHz)

Full-length cards supported

32/33MHz 32 bit 33 MHz

PCI 3 slots (32-bit 33-MHz)

Full-length cards supported

3.2 64-bit/100MHz PCI-X Subsystem

64/100 MHz segment supports these embedded devices and connectors:

•

Two 184-pin, 3.3 V, 64-bit PCI (-X) expansion connectors, numbered PCIX-1 (64/100)

and PCIX-2 (64/100).

•

One embedded 82544GC Gigabit Ethernet Controller.

3.2.1 Device IDs (IDSEL)

All slots on this segment support PCI (X) and conform to the PCI-X Specification, Revision

1.0a. Each device under the PCI-X host bridge has its IDSEL signal connected to one bit of

AD[31::16], which acts as a chip select on the PCI(-X) bus segment. This determines a unique

PCI (-X) device ID value for use in configuration cycles. Table 10 shows both the bit to which

each IDSEL signal is attached for 64/100MHz devices, and the corresponding device number.

Table 10. 64/100MHz Segment Configuration IDs

IDSEL Value Device

25 PCI (X) Slot #1, PCIX-1 (64/100)

24 PCI (X) Slot #2, PCIX-2 (64/100)

20 82544GC Gigabit Ethernet Controller

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 96 97

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