AMD-761 Datasheet, PDF (20/264 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
1.2
Recommended AMD Athlon™ Processor
SYS_CONFIG Settings
Table 2 provides recommendations for settings in the
AMD Athlon processor System Configuration register in
systems that utilize the AMD-761 system controller.
Table 2.
Recommended Settings for AMD Athlon™ Processor SYSCFG
Register
Bit Field Name
[22]
EvictEn
[17] SysUcLockEn
[16] ChxToDirtyDis
[13] SysFillValIsD1
[11]
ClVicBlkEn
SetDirtyEnE
SetDirtyEnO
[10:8]
SetDirtyEnS
BIOS
Setting
0
0
0
0
0
0
0
0
Comments
An Evict command, when set, is sent as
part of an INVD instruction. The Evict
command has no function in the
AMD-761™ system controller.
A LockToggle command, when set, is sent as
part of a LOCK instruction prefix and certain
other instructions. LockToggle has no
function in the AMD-761 system controller.
The AMD Athlon™ processor and the
AMD-761 system controller support
Change-To-Dirty commands.
ClVicBlkEn, when set, causes all evicted
clean blocks to cause the CleanVictimBlk
system interface command. This setting
has no function with the AMD-761 system
controller.
There are three set-to-dirty enables: Set-
DirtyEnE, SetDirtyEnO, and SetDirtyEnS. If
a given enable is set and a cache block
must make a transition from E-to-M, O-to-
M, or S-to-M, then the AMD Athlon proces-
sor performs the action indicated by the
setting of the ChxToDirtyDis field. How-
ever, if a given enable is cleared, the pro-
cessor takes no externally visible action
when the desired transition is performed.
Change to dirty commands are not needed
by the AMD-761 system controller.
8
Overview
Chapter 1