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5-182 Bus Interface

AMD-K5 Processor Technical Reference Manual 18524C/0—Nov1996

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–BE0 =FEh).

System logic must respond with BRDY.

System logic must assert NMI, INIT, RESET, or SMI to get the

processor out of the Shutdown state.

Figure 5-21. Shutdown Cycle

CLK

A31–A3

ADS

BE7–BE0

BRDY

CACHE

D/C

D63–D0

INTR

KEN

LOCK

M/IO

W/R

CLK

Shutdown

Occurs

Shutdown

Special

Cycle

…

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