AMD-761 Datasheet, PDF (235/264 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
0x0x0x70h
MRO Status/Control
31:19 Reserved
18
Self_Ref_En
17:11 Reserved
10
PCI pipe enable
9
PCI Block Write Enable
8:0
Reserved
0X0X0X80h
31:17
16
15:8
7:0
Who AM I
Reserved
BIU0 present
First AMD Athlon system bus ID
Who AM I
Initialized/
Required
Value
0b
1b
0000000b
1b
1b
000h
00b 000h
1b
00h
00h
Actual
Value
Key fcn( )
Notes
r
B
Enable memory self refresh
for S1/S3 states.
B
0 = MRO checks
outstanding read probe
B
before PCI transactions
1 = MRO pipelines PCI
transactions
0 = BIU does RID/INV
probes, forcing MRO MWQ
B
to wait for data movement
1 = BIU does NOP/INV probes
for PCI full-block writes
B
r
c
c
c
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
223