AMD-761 Datasheet, PDF (263/264 Pages) Advanced Micro Devices – AMD-761-TM System Controller Software/BIOS Design Guide

24081D—February 2002
Preliminary Information
AMD-761™ System Controller Software/BIOS Design Guide
Registers
-----
Bits
Description
0x1x0x30h AGP/PCI I/O Limit and Base
31:24 Reserved
23:16 IO_ Lim [23:16]
15:8 Reserved
7:0
IO_ Base [23:16]
0x1x0x3Ch
31:24
23
22
21
20
19
18
17
16
15:8
7:0
AGP/PCI Interrupt and
Bridge Control
Reserved
Bridge_Fast_B2B_En
Secon_Bus_ Reset
Mas_Abort_Mode
Reserved
VGA_En
ISA_En
SERR_En
Par_Resp_En
Int_Pin
Int_Line
0x1x0x40h Miscellaneous Device 1 Control
31:1
Reserved
0
Int_Pin_Cntl
Initialized/
Required
Value
Actual
Value
Key
fcn( )
Notes
00h
r
This field defines the upper
xxh
B
limit (inclusive) of the 24bit
I/O addresses passed to
the AGP/PCI bus.
00h
r
This field defines the base
xxh
B
(inclusive) of the 24bit I/O
addresses passed to the
AGP/PCI bus.
00h
0b
0b
0b
0b
1b
0b
yb
0b
xxh
xxh
000b
0000000h
xb
r
r
r
r
r
B
B
u
r
B
Enabled by 0x1x0x40[0]
B
r
B
1=Enable 0x1x0x3C[15:8]
KEY:
B= Mandatory BIOS function
A= AGP setup by BIOS
c = Calculated/set by AMD-761™ internal logic
P= Power management setup by BIOS o = Setup by OS or OS driver F = Performance enhancement set by BIOS
r = Hardcoded and reserved
u = PCI operational user interface E = Elective BIOS function
Chapter 7
Recommended BIOS Settings
251