AMD-761 Datasheet, PDF (246/264 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
0x0x0xC8h
31:23
22:16
15:7
6:3
2:1
0
Memory Base Address
Register 2
Chip-Select Base 2
Reserved
Chip-Select Mask 2
Reserved
Addr_Mode
Enable/Disable Bank 2
0x0x0xCCh
31:23
22:16
15:7
6:3
2:1
0
Memory Base Address
Register 3
Chip-Select Base 3
Reserved
Chip-Select Mask 3
Reserved
Addr_Mode
Enable/Disable Bank 3
Initialized/
Required
Value
Actual
Value
Key fcn( )
Notes
xxh xb
000b 0h
xxh xb
0h
xxb
xb
B
As 0x0x0xC0h above
r
As 0x0x0xC0h above
B
As 0x0x0xC0h above
r
As 0x0x0xC0h above
B
As 0x0x0xC0h above
B
As 0x0x0xC0h above
xxh xb
000b 0h
xxh xb
0h
xxb
xb
B
As 0x0x0xC0h above
r
As 0x0x0xC0h above
B
As 0x0x0xC0h above
r
As 0x0x0xC0h above
B
As 0x0x0xC0h above
B
As 0x0x0xC0h above
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
Memory Rules
1. Memory must be organized so that the largest banks occupy the lowest
addresses.
2. All memory registers must be initialized, even when they are 0 memory
registers do not default to 0.
3. Unbuffered memories can be configured two deep, registered
memories can be configured four deep. In all cases, unused memory
registers must be zeroed.
234
Recommended BIOS Settings
Chapter 7