Subsystem Configuration; Table 3-4. Host /Pci Bridgec - HP Deskpro EX Technical Reference Manual

Chapter 3 Processor/Memory Subsystem
3.4

SUBSYSTEM CONFIGURATION

The 82815 GMCH component provides the configuration function for the processor/memory
subsystem. Table 3-4 lists the configuration registers used for setting and checking such
parameters as memory control and PCI bus operation. These registers reside in the PCI
Configuration Space and accessed using the methods described in Chapter 4, section 4.2.
Table 3–4. Host/PCI Bridge Configuration Registers (GMCH, Function 0)
PCI
Config. Register
Addr.
00, 01h Vender ID
02, 03h Device ID
04, 05h Command
06, 07h Status
08h Revision ID
0A..0Bh Class Code
0Dh Latency Timer
0Eh Header Type
10..13h Aperture Base Config.
50, 51h PAC Config. Reg.
53h Data Buffer Control
55..56h DRAM Row Type
57h DRAM Control
58h DRAM Timing
59..5Fh PAM 0..6 Registers
60..67h DRAM Row Boundary
68h Fixed DRAM Hole
NOTES:
Refer to Intel Inc. documentation for detailed description of registers.
Assume unmarked locations/gaps as reserved.
[1] = 0090h for AGP (external graphics) implementation; = 0080h for GFX (internal i740)
implementation.
[2] = 8 for AGP; = 0 for GFX.
3-8 Compaq Deskpro EX Series of Personal Computers
Host/PCI Bridge Configuration Registers (GMCH, Device 0)
Reset
Value
8086h
1130h
0006h
[1]
--
--
00h
00h
[2]
00h
83h
00h
01h
00h
00h
01h
00h
First Edition - August 2000
Table 3-4.
PCI R
Config. egister
Addr.
6A, 6Bh DRAM Control Reg.
6C..6Fh Memory Buffer Strength
70h Multi-Transaction Timer
71h CPU Latency Timer
72h SMRAM Control
90h Error Command
91h Error Status Register 0
92h Error Status Register 1
93h Reset Control
A0..A3h AGP Capability Identifier
A4..A7h AGP Status
A8..ABh AGP Command
B0..B3h AGP Control
B4h Aperture Size
B8..BBh Aperture Translation Table
BCh Aperture I/F Timer
BDh Low Priority Timer
Reset
Value
00h
55h
00h
10h
02h
00h
00h
00h
00h
N/A
N/A
00h
00h
0000h
0000h
00h
00h