AMD-K6 Datasheet, PDF (178/346 Pages) Advanced Micro Devices – AMD-K6 Processor

AMD-K6^® Processor Data Sheet
Preliminary Information
20695H/0—March 1998
Shutdown Cycle
CLK
A[31:3]
BE[7:0]#
ADS#
LOCK#
M/IO#
D/C#
W/R#
D[63:0]
KEN#
BRDY#
In Figure 63, a shutdown (triple fault) occurs in the first half of
the waveform, and a shutdown special cycle follows in the
second half. The processor enters shutdown when an interrupt
or exception occurs during the handling of a double fault (INT
8), which amounts to a triple fault. When the processor
encounters a triple fault, it stops its activity on the bus and
generates the shutdown special bus cycle (BE[7:0]# = FEh).
The system logic must assert NMI, INIT, RESET, or SMI# to get
the processor out of the shutdown state.
Shutdown Occurs
(Triple Fault)
Shutdown Special Cycle
A[4:3] = 00b
FEh
Figure 63. Shutdown Cycle
160
Bus Cycles
Chapter 6