Compaq 4000N User Manual

Page 49

Advertising
background image

Technical Reference Guide

Compaq Deskpro 4000N and 4000S Personal Computers

First Edition - September1997

4-7

Not required

Table 4–4. PCI Function Configuration Acces

Table 4-4.

PCI Function Configuration Access

PCI Function

Device No.

Function No.

Host/PCI Bridge

0

0

PCI/ISA Bridge

7

0

IDE Interface

7

1

USB Interface

7

2

ACPI Cntlr.

7

3

Graphics Controller

15

0

Network Interface Controller

16

0

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.

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.

00h

Configuration

Space

Header

Vender ID

Data required by PCI protocol

Base Address Registers and Exp. ROM Address

Register
Index

31

Cache Line Size

Latency Timer

Device ID

Command

Status

Revision ID

Class Code

Header Type

BIST

Device-Specific Area

Interrupt Line

Interrupt Pin

Min_GNT

Min_Lat

24 23

16 15

8

7

0

04h

08h

0Ch

3Ch

40h

FCh

Advertising
This manual is related to the following products: