AMD-761 Datasheet, PDF (227/264 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
Initialized/
Required
Value
Actual
Value
Key fcn( )
Notes
0x0x0x34h AGP/PCI Capabilities Pointer
31:8 Reserved
000000h
7:0 Capabilities Pointer
A0h
0x0x0x44h
31:11
10:8
7:4
Extended BIU Control
Reserved
P0_WrDataDly
Reserved
3
P0_2BitPF
2:0 Reserved
0x0x0x48h
ECC Mode/Status
31:16 Reserved
000h
yyyb
0b
1b
0b
0000h
15:14 SERR_Enable
xxb
13
Reserved
0b
12
ECC_Diag
0b
ECC_Mode
11:10
xxb
SPD # 11
9:8 ECC_Status
00b
7:4 ECC_CS_MED
yh
3:0 ECC_CS_SED
yh
r
AGP function pointer
r
First item in AGP
capabilities list
r
r
r
B
Must be set for
AMD Athlon™ processor
B
Must be set by BIOS
r
00b = ECC/SERR Disabled
1xb = SERR on Multi_Bit Errors
B
x1b = SERR on Single Bit Errors
See SERR# 0x0x0x4[8]
r
B
0 = Disable, 1= Enable
00b = NO ECC or ECC Disabled
01b = Data Errors Reported
B SPD ^{10b = Data Errors Corrected}
for Memory and PCI /AGP
11b = Data Errors Corrected
and Memory Scrubbed
00b = No Error
x1b =MED Multi Bit Error
Detect
B
1xb =SED Single Bit Error
Detect
R/W/1C
c
CS of first MED
c
CS of first SED
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
215