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Table 4–4. PCI Function Configuration Acces
PCI Function Configuration Access
PCI Function
Host/PCI Bridge (440LX)
PCI/AGP Bridge (440LX)
PCI/ISA Bridge (82371)
IDE Interface (82371)
USB Interface (82371)
ACPI 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 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 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition–- October 1997
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
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