AMD-761 Datasheet, PDF (238/264 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
0x0x0x88h
Config Status
31:29 AGP_Clk_Mux
28:26 Sys_Clk_Mux
25
Type_Det
24
S2K_Thresh
23
K7_PP_En
22
IG_PP_En
21:20 Clk_Speed
19:18 Reserved
17:16 S2K_Bus_Len
15
Tristate_En
14
Nand_En
13
Bypass_PLLs
12
Dis_Divider
11:8 Reserved
7
Sip_ROM
6
Reg_DIMM_En
5
In_Clk_En
4
Out_Clk_En
3:0
CPU0_Divider
0x0x0x9Ch
PCI Top of Memory
31:24 PCI Memory Top
23:0 Reserved
Initialized/
Required
Value
Actual
Value
Key fcn( )
Notes
yyyb
r
yyyb
r
0=1.5-V AGP Card
yb
r
Signalling
1=3.3-V AGP Card
Signalling
yb
r
1b
r
1b
r
FSB speed:
00b=100 MHz
yyb
r
01b=66 MHz
10b= Reserved
11b=133 MHz
yyb
r
yyb
r
yb
r
yb
r
yb
r
yb
r
yh
r
yb
r
yb
r
0=Unbuffered,
1=Registered
yb
r
yb
r
yh
r
xxh
000_0000h
B
Actual Memory Size
AD[31:24]
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
226
Recommended BIOS Settings
Chapter 7