AMD AMD5K86 - FIGURE 5-22. FLUSH-Acknowledge Cycle

AMD~
18524B/O-Mar1996
AMD5~6 Processor Technical Reference Manual
Shutdown Cycle
Figure 5-21 shows a shutdown and the special cycle that fol-
lows. The processor enters shutdown when an interrupt or
exception occurs during the handling of a double fault (vector
8), which amounts to a triple fault. When the processor encoun-
ters such a triple fault, it stops its activity on the bus and gen-
erates the special bus cycle for shutdown (BE7-BEU = FEh).
System logic must respond with BRDY.
System logic must assert NMI, INIT, RESET, or sm to get the
processor out of the Shutdown state.
ClK
A31-A3
BE7-BEO
ViffiE
O/C
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INTR
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ClK
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I
: Shutdown
I Occurs
I
FIGURE 5-21. Shutdown Cycle
Bus Cycle Timing
•••
.
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; I I
I ., i \ I .. ,
~
: Shutdown
I Special
: Cycle
5-183