AMD-761 Datasheet, PDF (254/264 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
0x0x1x8Ch DDR DQS/MDAT Pad Config
31:30 Reserved
29:27 PSlewMDAT
26:24
23:20
19:18
NSlewMDAT
Reserved
PDrvMDAT
17:16 NDrvMDAT
15:14 Reserved
13:11 PSlewDQS
10:8 NSlewDQS
7:4
Reserved
3:2
PDrvDQS
1:0
NDrvDQS
Initialized/
Required
Value
Actual
Value
Key
fcn( )
Notes
00b
r
101b
B
Slowest 000b <-> 111b Fastest
MDAT Rising Edge Slew Rate
101b
B
Slowest 000b <-> 111b Fastest
MDAT Falling Edge Slew Rate
0h
r
Weakest 00b<->11b Strongest
11b
B
MDAT P Transistor Drv Strength
Weakest 00b<->11b Strongest
10b
B
MDAT N Transistor Drv Strength
00b
r
Slowest 000b <-> 111b Fastest
101b
B
DQS Rising Edge Slew Rate
Slowest 000b <-> 111b Fastest
101b
B
DQS Falling Edge Slew Rate
0h
r
Weakest 00b<->11b Strongest
11b
B
DQS P Transistor Drv Strength
10b
B
Weakest 00b<->11b Strongest
DQS N Transistor Drv Strength
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
242
Recommended BIOS Settings
Chapter 7