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Functional Architecture
Intel® Server Board SE7520AF2 TPS
52
Revision
1.2
Intel order number C77866-003
ICH5-R P32-A
5 V
32-bits
33 MHz
PCI
ATI* Rage XL
PXH P64-A
3.3 V
64-bits
133 MHz
PCI-X
Slot 5 (PCI-X 64/133)
PXH P64-B
3.3 V
64-bits
100 MHz
PCI-X
Slot 6 (PCI-X 64/100)
Intel® 82546GB Dual Gb NIC
IOP332 P64-A
3.3 V
64-bits
133 MHz
PCI-X
LSI Logic* 53C1030 U320 SCSI
controller
IOP332 P64-B
3.3 V
64-bits
133 MHz
PCI-X
Slot 1 (PCI-X 64/133)
MCH PExp-B
Diff.
Serial
2.5GHz
PCI Exp
Slot 4 (PCI Exp x8)
MCH PExp-C
Diff.
Serial
2.5GHz
PCI Exp
Slot 3 (PCI Exp x4)
3.4.1.1
ICH5-R P32-A: 32-bit, 33-MHz PCI Subsystem
The 32-bit, 33-MHz PCI segment enabled by the ICH5-R is known as the ICH5-R P32-A
segment. This segment supports the on-board 2D/3D Graphics ATI* Rage XL video controller.
3.4.1.1.1
Device IDs (IDSEL)
The 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 the 32-bit on-board device.
Table 8. ICH5-R P32-A Configuration IDs
IDSEL Value
Device
28
ATI* Rage XL video controller
3.4.1.1.2
ICH5-R P32-A Arbitration
The ICH5-R P32-A segment only supports the ATI Rage XL video controller which must
arbitrate for PCI access, using resources supplied by the ICH5-R. The host bridge PCI interface
(ICH5-R) 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.
Table 9. ICH5-R P32-A Arbitration Connections
Baseboard Signals
Device
PCI_REQ0*/PCI_GNT0*
ATI* Rage XL video controller
3.4.1.2
PXH P64-A and P64-B: 64-bit, 100/133-MHz PCI Subsystem
The two peer 64-bit PCI-X bus segments are directed through the PXH PCI Bridge. The first
PCI-X segment, P64-A, supports the interface for the PCI expansion Slot 5 (PCI-X 64/133).