Intel® Server Board SE7520AF2 TPS
Functional Architecture
Revision 1.2
55
Intel order number C77866-003
Table 15. IOP332 P64-B Configuration IDs
IDSEL Value
Device
17
Slot 1 (PCI-X 64/133)
3.4.1.3.2
IOP332 P64-A Arbitration
The IOP332 P64-A bus segment supports the on-board LSI Logic* 53C1030 U320 Dual
Channel SCSI controller which must arbitrate for PCI access using resources supplied by the
IOP332. The I/O bridge PCI interface arbitration lines PAREQx* and PAGNTx* are a special
case in that they are internal to the host bridge. The following table defines the arbitration
connections.
Table 16. IOP332 P64-B Arbitration Connections
Baseboard Signals
Device
IOP_PAREQ0*/IOP_PAGNT0*
LSI Logic* 53C1030 U320 SCSI controller
3.4.1.3.3
IOP332 P64-B Arbitration
The IOP332 P64-B bus segment only supports the PCI expansion Slot 1 (PCI-X 64/133) which
must arbitrate for PCI access using resources supplied by the IOP332. The I/O bridge PCI
interface arbitration lines PBREQx* and PBGNTx* are a special case in that they are internal to
the host bridge. The following table defines the arbitration connections.
Table 17. IOP332 P64-B Arbitration Connections
Baseboard Signals
Device
IOP_PBREQ0*/IOP_PBGNT0*
Slot 1 (PCI-X 64/133)
3.4.1.4
MCH PExp-B and PExp-C: x8/x4 PCI Express* PCI Subsystem
The PCI Express* PExp-B and PExp-C segments are enabled from the MCH. The first segment,
PExp-B, supports a x8 interface for the PCI Express* expansion Slot 4 (PCI EXP x8). The
second segment, PExp-C, supports a x4 interface for the PCI Express* expansion Slot 3 (PCI
EXP x4). Both expansion slots are enabled with x8 physical connectors and offer hot-plug
support on the hot-plug Server Board SE7520HPAF2 SKU.
Given the serial point-to-point nature of the PCI Express* architecture, arbitration does not
apply; for details on the MCH PCI Express* implementation, refer to Section 3.1.1.3.
3.4.2 Interrupt
Routing
The Intel® Server Board SE7520AF2 interrupt architecture accommodates both PC-compatible
PIC mode and APIC mode interrupts through use of the integrated I/O APICs in the ICH5-R.