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and GNTx* are a special case in that they are internal to the host bridge. The following table
defines the arbitration connections.
Baseboard Signals
PCIX REQ_N0/GNT_N0
5.1.3
P64-C 66/100-MHz PCI-X Subsystem
One 64-bit PCI-X bus segment is directed through the PXH. This PCI-X segment, P64-C,
provides two 3.3V 64-bit PCI-X slots or one 3.3V 64-bit PCI-X riser slot, (SE7221BK1LX sku
only) capable of up to 100 MHz operation (with 1 adapter, either slot is capable of 100MHz,
only speeds of 66MHz are supported with two adapters populated) and supports full-length
PCI and PCI-X adapters.
5.1.3.1
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-C devices and corresponding device description.
IDSEL Value
Device
PCI Slot 4 (64bit/66-100MHz)/ PCI Slot 6 (64bit/100MHz) (Riser, SE7221BK1LX sku
17
only)
18
PCI Slot 5 (64bit/66-100MHz)
5.1.3.2
P64-C Arbitration
P64-C supports two PCI masters: two PCI-X slots or one riser slot. All PCI masters must
arbitrate for PCI access using resources supplied by the ICH6. The host bridge PCI interface
(ICH6) 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
PCIX REQ_N0/GNT_N0
PCIX REQ_N1/GNT_N1
16
Table 9. P32-B Arbitration Connections
Device
Intel® 82541PI LAN (NIC2)
Table 10. P64-C Configuration IDs
Table 11. P64-C Arbitration Connections
Device
PCI Slot 4 (64bit/66M) / PCI Slot 6 (64bit/100
only)
PCI Slot 5(64bit/66M)
SE7221BK1-E Technical Product Specification
M) (Riser, SE7221BK1LX sku
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