Pc-concepts SHG2 DP User Manual download pdf (Page 31)

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

Revision 1.0 Intel Order Number C11343-001

3.2.2 64/100MHz PCI-X Arbitration

A 64/100MHz segment supports three PCI (-X) masters: slots PCIX-1 (64/100), PCIX-2

(64/100), and 82544GC Gigabit Ethernet Controller. All PCI (-X) masters must arbitrate for PCI

(-X) access, using resources supplied by the CIOB-X2. The host bridge PCI (-X) interface

(CIOB-X2) arbitration lines REQx* and GNTx* are a special case in that they are internal to the

host bridge. Table 11 defines the arbitration connections.

Table 11. 64/100MHz Segment Arbitration Connections

Baseboard Signals Device

P1_REQN1/P1_GNTN1 64/100MHz Slot PCIX-1 (64/100)

P1_REQN0/P1_GNTN0 64/100MHz Slot PCIX-2 (64/100)

P1_REQN2/P1_GNTN2 82544GC Gigabit Ethernet Controller

3.2.3 82544GC Gigabit Ethernet Controller

The Intel 82544GC Gigabit Ethernet Controller is an integrated third-generation Ethernet LAN

component capable of providing 1000, 100, and 10 Mbps data rates. It is a single-chip device,

containing both the MAC and PHY layer functions.

The 82544GC utilizes a 64 bit, 100 MHz direct interface to the PCI-X bus, compliant with the

PCI Local Bus Specification, Revision 1.0a.

3.3 64-bit/133MHz PCI-X Subsystem

A 64/133 MHz segment supports these embedded devices and connectors:

•

One dual channel Ultra 160 SCSI controller—Adaptec AIC7899 SCSI controller.

Note: The AIC7899 is a PCI device, when enabled; the PCI expansion slot connector is

limited to running at 66 MHz in PCI mode.

•

One 184-pin, 3.3 V, 64-bit PCI (-X) expansion connector, numbered PCIX-6 (64/133).

3.3.1 Device IDs (IDSEL)

The PCI (-X) IDSEL signal connections to S1 AD[31::11] lines for 64/133 MHz devices are

shown in Table 12.

Table 12. 64/133MHz Segment Configuration IDs

IDSEL Value Device

24 PCI (-X) Slot #6, PCIX-6 (64/133)

25 7899 or 7902 SCSI Controller

3.3.2 64/133MHz Segment Arbitration

A 64/133 MHz segment supports three PCI (X) masters: slot PCIX-6 (64/133), 7899 SCSI

controller, and the CIOB-X2 controller. All PCI (-X) masters must arbitrate for PCI (X) access

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Pc-concepts SHG2 DP User Manual Page 31