AMD-761 Datasheet, PDF (260/264 Pages) Advanced Micro Devices – AMD-761-TM System Controller Software/BIOS Design Guide

Preliminary Information
AMD-761™ System Controller Software/BIOS Design Guide
24081D—February 2002
Registers
-----
Bits
Description
0x1x0x0Ch
31:24
23:16
15:8
7:0
AGP/PCI Header Type
Reserved
Header_Type
Pri_Lat_Timer
Reserved
0x1x0x18h
31:24
23:16
15:8
7:0
AGP/PCI Sub Bus Num/
Secondary Latency Timer
Secon_Lat_Timer
Sub_Bus_Num
Secon_Bus_Num
Pri_Bus_Num
Initialized/
Required
Value
00h
01h
40h
00h
40h
01h
01h
00h
Actual
Value
Key fcn( )
r
r
B
r
B
B
B
r
Notes
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
248
Recommended BIOS Settings
Chapter 7