Compaq Deskpro EP 6233 Technical Reference Manual page 57

Table 4–4. PCI Function Configuration Acces
PCI Function Configuration Access
PCI Function
Host/PCI Bridge (82443)
PCI/AGP Bridge (82443)
PCI/ISA Bridge (82371)
IDE Interface (82371)
USB Interface (82371)
Power Management Cntlr. (82371)
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 (see Figure 4-4), of which the first 64 bytes compose the configuration space header.
31
Min_Lat
Configuration
Space
Header
BIST
Data required by PCI protocol
Figure 4–4. PCI Configuration Space Map
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 used in these systems are listed in Table 4-5.
Table 4-4.
Device No.
0
0
20
20
20
20
24 23 16 15
Device-Specific Area
Min_GNT Interrupt Pin
Base Address Registers and Exp. ROM Address
Latency Timer
Header Type
Class Code
Status
Device ID
Not required
Compaq Deskpro EP Series of Personal Computers
First Edition–- April 1998
Technical Reference Guide
Function No.
0
1
0
1
2
3
8 7 0
Interrupt Line
Cache Line Size
Revision ID
Command
Vendor ID
Register
Index
FCh
40h
3Ch
0Ch
08h
04h
00h
4-7