Pci Configuration; Pci Functionc - Compaq Deskpro 4000N Technical Reference Manual

Table 4–4. PCI Function Configuration Acces
PCI Function Configuration Access
PCI Function
Host/PCI Bridge
PCI/ISA Bridge
IDE Interface
USB Interface
ACPI Cntlr.
Graphics Controller
Network Interface Controller
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
7
7
7
7
15
16
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 4000N and 4000S Personal Computers
First Edition - September1997
Technical Reference Guide
Function No.
0
0
1
2
3
0
0
8 7 0
Interrupt Line
Cache Line Size
Revision ID
Command
Vender ID
Register
Index
FCh
40h
3Ch
0Ch
08h
04h
00h
4-7