Compaq EN Series Technical Reference Manual page 56

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 comprise 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 vender ID (assigned to the vender by the PCI Special Interest
Group) and a device ID (assigned by the vender). The device and vender IDs for the devices on
the system board 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 EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
Technical Reference Guide
Function No.
0
1
0
1
2
3
8 7 0
Interrupt Line
Cache Line Size
Revision ID
Command
Vender ID
Register
Index
FCh
40h
3Ch
0Ch
08h
04h
00h
4-7