AMD-761 Datasheet, PDF (25/264 Pages) Advanced Micro Devices – AMD-761-TM System Controller Software/BIOS Design Guide

24081D—February 2002
Preliminary Information
AMD-761™ System Controller Software/BIOS Design Guide
Table 4. AMD Athlon™ Processor Special Cycle Encodings (Continued)
Special Cycle
PCI Address and
Data Field
Contents
Processor Description
Northbridge and Southbridge
Description
INVALIDATE
0002 0002
The AMD Athlon™ processor gener-
ates in response to executing an INVD
instruction WrLWs command:
SysAddOut: MSB=0 & [33:0] = 1
F8000 0000
SysDatOut: [31:0] = 0002 0002
The AMD-761™ system controller
forwards onto the PCI bus the PCI
special cycle command: AD[31:0] =
0002 0002 (address and data).
AMD-766™ peripheral bus controllers
ignores.
FLUSHACK
0003 0002
The AMD Athlon processor generates
in response to assertion of the FLUSH
pin after all caches have been flushed
to memory. WrLWs command:
SysAddOut: MSB=0 & [33:0] = 1
F8000 0000
SysDatOut: [31:0] = 0003 0002
The AMD-761 system controller
forwards onto the PCI bus, PCI special
cycle command: AD[31:0] = 0003 0002
(address and data).
AMD-766 peripheral bus controllers
ignores.
CONNECT
0004 0002
The AMD Athlon processor generates
CONNECT as the first cycle after
STOP/GRANT or HALT AMD Athlon
system bus special cycle regardless of
whether or not a disconnect is
achieved (or even attempted).
WrLWs command:
SysAddOut: MSB= 0 &
[33: 0] = 1 F8000 0000
SysDatOut: [31: 0] = 0004 0002
The AMD-761 system controller
forwards onto the PCI bus, PCI special
cycle command: AD[31: 0] = 0004
0002
(address and data)
AMD-766 peripheral bus controllers
ignores.
SMM ACK
(ENTER)
0005 0002
The AMD Athlon processor generates
an SMM ACK (ENTER) when entering
a system management interrupt.
WrLWs command:
SysAddOut: MSB= 0 &
[33: 0] = 1 F8000 0000
SysDatOut: [31: 0] = 0005 0002
The AMD-761 system controller
forward onto the PCI bus, special cycle
command: AD[31: 0] = 0005 0002.
SMM ACK (EXIT)
0006 0002
The AMD Athlon processor generates
SMM ACK (EXIT) when exiting from a
system management interrupt.
WrLWs command:
SysAddOut: MSB= 0 &
[33: 0] = 1 F8000 0000
SysDatOut: [31: 0] = 0006 0002
The AMD-761 system controller
forwards to the PCI bus.
Command: AD[31: 0] = 0006 0002.
Chapter 2
AMD-761™ System Controller Programmer’s Interface
13