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PCI I/O Subsystem
5.1.1.2
P32-A Arbitration
P32-A supports six PCI devices: the ICH4 and five PCI bus masters (one NIC, one sATA RAID
controller, two PCI slots and one ATI Rage XL video controller). All PCI masters must arbitrate
for PCI access, using resources supplied by the ICH4. The host bridge PCI interface (ICH4)
arbitration lines REQx* and GNTx* are a special case in that they are internal to the host bridge.
The following table defines the arbitration connections.
Baseboard Signals
P32_REQ0*/P32_GNT0*
P32_REQ1*/P32_GNT1*
P32_REQ2*/P32_GNT2*
P32_REQ3*/P32_GNT3*
P32_REQ4*/P32_GNT4*
5.1.2
P64-B and P64-C: 64-bit/100- or 66-MHz PCI Subsystem
Two peer 64-bit bus segments are directed through the P64H2 I/O Bridge. The first PCI
segment, P64-B, provides two 3.3V 64-bit PCI-X slots capable of 100 MHz operation and
support full-length PCI cards.
The second PCI segment, P64-C, provides a single 3.3V 64-bit PCI slot operating at 66 MHz.
This segment supports full-length PCI cards. P64-C also has an embedded Intel 82540EM fast
Ethernet gigabit controller.
5.1.2.1
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 the bit to
which each IDSEL signal is attached for P64-B devices and corresponding device description.
IDSEL Value
17
18
34
Table 9. P32-A Arbitration Connections
PCI 33MHz Slot 1
PCI 33MHz Slot 2
ATI Rage XL video controller
Intel 8 2550PM Fast Ethernet Controller (NIC1)
Silicon Image Serial ATA Controller
Table 10. P64-B Configuration IDs
IDSEL Value
17
PCI-X 100MHz Slot 4
18
PCI-X 100MHz Slot 3
Table 11. P64-C Configuration IDs
PCI 66MHz Slot 5
Intel 82540EM Fast Ethernet Controller (NIC2)
Intel part number C32194-002
Intel® Server Board SE7505VB2
Device
Device
Device
Revision 1.2
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