HP Compaq D315 Technical Reference Manual page 55

The register index (CF8h, bits <7..2>) identifies the 32-bit location within the configuration space
of the PCI device to be accessed. All PCI devices can contain up to 256 bytes of configuration
data (Figure 4-3), of which the first 64 bytes comprise the configuration space header.
31 24
Min. Lat.
Expansion ROM Base Address
Subsystem ID
Configuration
Space
Header
BIST
Status
Device ID
PCI Configuration Space Type 0
Data required by PCI protocol
Figure 4-3. PCI Configuration Space Mapping
Each PCI device is identified with a vendor ID (assigned to the vendor by the PCI Special Interest
Group) and a device ID (assigned by the vendor). The device and vendor IDs for the devices on
the system board are listed in Table 4-2 (NOTE: only devices that are implemented in these
systems are listed).
23 16 15 8 7
Device-Specific Area
Min. GNT Int. Pin Int. Line
Reserved
Reserved
Subsystem Vendor ID
Card Bus CIS Pointer
Base Address Registers
Hdr. Type Lat. Timer Line Size
Class Code Revision ID
Command
Vendor ID
Second Edition - April 2003
Register
Index
0 31 24 23
FCh
40h
Bridge Control
3Ch
Expansion ROM Base Address
38h
34h
I/O Limit Upper 16 Bits
30h
2Ch Prefetchable Limit Upper 32 Bits
28h
Prefetchable Base Upper 32 Bits
Prefetch. Mem. Limit
Memory Limit
Secondary Status
nd
2 Lat.Tmr
10h
BIST
0Ch
08h
04h
Status
00h
Device ID
PCI Configuration Space Type 1
Not required
Compaq D315 and hp d325 Personal Computers
Featuring the AMD Athlon XP Processor
Technical Reference Guide
16 15 8 7
Device-Specific Area
Int. Pin Int. Line
Reserved
I/O Base Upper 16 Bits
Prefetch. Mem. Base
Memory Base
I/O Limit I/O Base
Sub. Bus # Sec. Bus # Pri. Bus #
Base Address Registers
Hdr. Type Lat. Timer Line Size
Class Code Revision ID
Command
Vendor ID
Register
Index
0
FCh
40h
3Ch
38h
34h
30h
2Ch
28h
24h
20h
1Ch
18h
10h
0Ch
08h
04h
00h
4-5