AMD-761 Datasheet, PDF (262/264 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
Initialized/
Required
Value
Actual
Value
Key
fcn( )
Notes
0x1x0x20h AGP/PCI Memory Limit and Base
31:20 MLim[31:20]
xxxh
19:16 Reserved
0h
15:4 MBase[31:20]
xxxh
3:0
Reserved
0h
Memory Limit Address
defining top address to be
used by AGP target graphics
B
controller for control
registers and buffers. The
lower 20 bits are 0xFFFFF
for 1-Mbyte granularity.
r
Memory Limit Address
defining lower address to be
used by AGP target graphics
B
controller for control
registers and buffers. The
lower 20 bits are 0xFFFFF
for 1-Mbyte granularity.
r
0x1x0x24h
AGP/PCI Prefetchable
Memory Limit and Base
31:20 MLim [31:20]
xxxh
19:16
0h
15:4 MBase [31:20]
xxxh
3:0
Reserved
0h
Prefetchable Memory Limit
Address defining top address
to be used by AGP target
B
graphics controller for control
registers and buffers. The
lower 20 bits are 0xFFFFF for
1-Mbyte granularity.
r
Prefetchable Memory Base
Address defining lower
address to be used by AGP
B
target graphics controller for
control registers and buffers.
The lower 20 bits are 0xFFFFF
for 1-Mbyte granularity.
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
250
Recommended BIOS Settings
Chapter 7