64-Bit, 66-Mhz Pci Subsystem; Table 5. P32-A Configuration Ids; Table 6. P32-A Arbitration Connections - Intel SDS2 Specification

I/O Subsystem
4.1.1.2 P32-A Arbitration
P32-A supports seven PCI masters (ATA RAGE XL, two Intel 82550s, PCI masters from slots 3
and 4, CSB5, and HE-SL). All PCI masters must arbitrate for PCI access, using resources
supplied by the HE-SL. The following table defines the arbitration connections.
REQ_VGA / GNT_VGA
D_PCIREQL1 / D_PCIGNTL1
D_PCIREQL2 / D_PCIGNTL2
D_PCIREQL3 / D_PCIGNTL3
D_PCIREQL4 / D_PCIGNTL4
D_PCIREQL5 / D_PCIGNTL5
4.1.2

64-bit, 66-MHz PCI Subsystem

There are two 64-bit, 66-MHz PCI busses directed through the CIOB20 I/O Bridge. Both segments
support full-length, full-height PCI cards. The PCI cards must meet the PCI specification for height,
inclusive of cable connections and memory. The two PCI segments are peer buses.
4.1.2.1 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 tables show the bit to
which each IDSEL signal is attached for P64-B and P64-C devices, and corresponding device
description.
12

Table 5. P32-A Configuration IDs

IDSEL Value
18 ATI RAGE XL Video Controller
19 Intel 82550 Fast Ethernet Controller 1
20 Intel 82550 Fast Ethernet Controller 2
24 PCI Slot 3
25 PCI Slot 4
31 CSB5 South Bridge

Table 6. P32-A Arbitration Connections

Baseboard Signals
Order Number: A85874-002
Device
Device
ATI* RAGE XL Video Controller
Intel 82550 Fast Ethernet Controller 1
Intel 82550 Fast Ethernet Controller 2
PCI Slot 3
PCI Slot 4
CSB5 South Bridge
Intel® Server Board SDS2
Revision 1.2