AMD-761 Datasheet, PDF (242/264 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
0x0x0xB8h
Description
AGP Compensation Bypass
31:28 BYP_PDrvXfer
27:24 BYP_NDrvXfer
23
BYPXfer
22:20 Reserved
19:18 BYP_PSlewXfer
17:16 BYP_NSlewXfer
15:12 BYP_PDrvStrb
11:8 BYP_NDrvStrb
Initialized/
Required
Value
Actual
Value
Key
fcn( )
Notes
P Drive bypass value for data
xh
A B4/BB ^{Refer to “BIOS Initialization}
Requirements” on page 209
for details.
N Drive bypass value for data
xh
A
B4/BB
Refer to “BIOS Initialization
Requirements” on page 209
for details.
1=Enable Drive Bypass for
Data
xb
A B4/BB _{Refer to “BIOS Initialization}
Requirements” on page 209
for details.
000b
r
P slew rate value for data
xxb
A
B4/BB
Refer to “BIOS Initialization
Requirements” on page 209
for details.
N slew rate value for data
xxb
A B4/BB ^{Refer to “BIOS Initialization}
Requirements” on page 209
for details.
P drive bypass value for
strobes
xh
A B4/BB _{Refer to “BIOS Initialization}
Requirements” on page 209
for details.
N drive bypass value for
strobes
xh
A B4/BB _{Refer to “BIOS Initialization}
Requirements” on page 209
for details.
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
230
Recommended BIOS Settings
Chapter 7