AMD-761 Datasheet, PDF (234/264 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
0x0x0x60h
31
30:28
27:25
24:22
21:19
BIU0 Status/Control
Probe enable for CPU0
Reserved
Xca_Probe_Cnt
Xca_RD_Cnt
Xca_WR_Cnt
18
AMD Athlon system bus halt
disconnect enable
17
AMD Athlon system bus stop
grant disconnect enable
16:14 Probe limit
Ack limit
13:10 0000 = 1 un-acked command
0001 = 2.......
Bypass_ En
9
Super Bypass Enable
8:7 SysDC_Out_ delay
6:3 SysDC_In_ delay
2
WR2_RD
1:0 RD2_WR
0x0x0x64h
BIU0 SIP
31
ClkFwd Offset
30:0 RO from Init/SIP logic
Initialized/
Required
Value
Actual
Value
Key
fcn( )
Notes
1b
000b
010b
110b
110b
0b
1b
110b
0011b
1b
yyb
yyyyb
yb
yyb
B
0=Disable, 1=Enable
B
B
B
B
0=Disable 1=Enable
B
Refer to “Power
Management” on page 185
for details.
0=Disable, 1=Enable
B
Refer to “Power
Management” on page 185
for details.
B
0-7 = 1 to 8 probes
110b = 7 recommended
This field should be used to
r
set up SysAckLimit in
AMD Athlon™
(+1 to this value) (SYSCFG)
B
0=Disable, 1=Enable
r
From init logic
r
From init logic
r
From init logic
r
From init logic
0b
yyyb
yy_yyyyh
0=Delay groups 1 and 3
B
1=No delays
r
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
222
Recommended BIOS Settings
Chapter 7