AMD-761 Datasheet, PDF (255/264 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
0x0x1x90h
DDR CLK/CS Pad
Configuration
31:30 Reserved
29:27 PSlewCLK
26:24
23:20
19:18
NSlewCLK
Reserved
PDrvCLK
17:16 NDrvCLK
15:14 Reserved
13:11 PSlewCS
10:8 NSlewCS
7:4
Reserved
3:2
PDrvCS
1:0
NDrvCS
Initialized/
Required
Value
Actual
Value
Key
fcn( )
Notes
00b
r
101b
B
Slowest 000b <-> 111b Fastest
CLK Rising Edge Slew Rate
Slowest 000b <-> 111b Fastest
101b
B
CLK Falling Edge Slew Rate
0h
r
Weakest 00b<->11b Strongest
11b
B
CLK P Transistor Drv Strength
10b
B
Weakest 00b<->11b Strongest
CLK N Transistor Drv Strength
00b
r
Slowest 000b <-> 111b Fastest
101b
B
CS Rising Edge Slew Rate
Slowest 000b <-> 111b Fastest
101b
B
CS Falling Edge Slew Rate
0h
r
11b
B
Weakest 00b<->11b Strongest
CS P Transistor Drv Strength
10b
B
Weakest 00b<->11b Strongest
CS 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
Chapter 7
Recommended BIOS Settings
243