3.2.1PCI Subsystem

The primary I/O buses for the server board are PCI, PCI Express*, and PCI-X, with six independent PCI bus segments. The PCI buses comply with the PCI Local Bus Specification, Revision 2.3. The following table lists the characteristics of the PCI bus segments. Details about each bus segment follow the table.

Table 8. PCI Bus Segment Characteristics

3.2.1.1PCI32: 32-bit, 33-MHz PCI Subsystem

All 32-bit, 33-MHz PCI I/O is directed through the ESB2-E ICH6. The 32-bit, 33-MHz PCI segment created by the ESB2-E-ICH6 is known as the PCI32 segment. The PCI32 segment supports the following embedded devices:

2D Graphics Accelerator: ATI* ES1000 Video Controller

3.2.1.2PXA: 64-bit, 133-MHz PCI Subsystem

One 64-bit PCI-X bus segment is directed through the ESB2-E ICH6. This PCI-X segment, PXA, is routed to PCI-X Slots 1 and 2. With only one PCI-X adapter populated in Slot 2 and Slot 1 left empty, PCI-X Slot 2 supports a maximum speed of 133 MHz. With both Slot 1 and Slot 2 populated, Slot 2 supports a maximum speed of 100MHz. PCI-X Slot 1 supports a maximum speed of 100 MHz even when Slot 2 is not populated.

3.2.1.3PE0: One x4 PCI Express* Bus Segment

One x4 PCI Express* bus segment is directed through the ESB2-E. This PCI Express* segment, PE0, is routed to PCI Express* Slot 4 that is special keyed to support ROMB card.

3.2.1.4PE1: One x4 PCI Express* Bus Segment

One x4 PCI Express* bus segment is directed through the ESB2-E. This PCI Express* segment, PE1, is routed to PCI Express* Slot 3. This becomes a x8 PCI Express* bus segment by combining PE2 with PE1 for SATA server board or ROMB server board that do not have onboard SAS controller.

3.2.1.5PE2: One x4 PCI Express* Bus Segment

One x4 PCI Express* bus segment is directed through the ESB2-E. This PCI Express* segment, PE2, is routed to PCI Express* Slot 3 for server boards that do not have on-board SAS controller (SATA server board or ROMB server board), or to the on-board SAS controller for server boards that do have on-board SAS controller (SAS server board).

3.2.1.6PE4, PE5: Two x4 PCI Express* Bus Segments

Two x4 PCI Express* bus segments are directed through the MCH. These PCI Express* segments, PE4 and PE5, are routed to PCI Express* Slot 5.

3.2.1.7PE6, PE7: Two x4 PCI Express* Bus Segments

Two x4 PCI Express* bus segments are directed through the MCH. These PCI Express* segments, PE6 and PE7, are routed to PCI Express* Slot 6.

3.2.1.8PCI Express* Riser Slot

PCI Express* Slot 6 supports third-party riser cards for both 1U and 2U system configurations. Two PCI Express* pins are designated as Riser Type pins with the definitions noted in the following table: