AMD-K6-2ESLASH233AMZ datasheet(267/332 Pages) AMD

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Chapter 13

Clock Control

249

22529B/0—January 2000

AMD-K6™-2E Processor Data Sheet

Preliminary Information

13.2

Halt State

Enter Halt State

During the execution of the HLT instruction, the AMD-K6-2E

processor executes a Halt special cycle. After BRDY# is

sampled asserted during this cycle, and then EWBE# is also

sampled asserted (if not masked off), the processor enters the

Halt state in which the processor disables most of its internal

clock distribution.

To support the following operations, the internal phase-lock

loop (PLL) continues to run, and some internal resources are

still clocked in the Halt state:

Inquire Cycles—The processor continues to sample AHOLD,

BOFF#, and HOLD to support inquire cycles that are

initiated by the system logic. The processor transitions to

the Stop Grant Inquire state during the inquire cycle. After

returning to the Halt state following the inquire cycle, the

processor does not execute another Halt special cycle.

Flush Cycles—The processor continues to sample FLUSH#.

If FLUSH# is sampled asserted, the processor performs the

flush operation in the same manner as it is performed in the

Normal state. Upon completing the flush operation, the

processor executes the Halt special cycle which indicates

the processor is in the Halt state.

Time Stamp Counter (TSC)—The TSC continues to count in

the Halt state.

Signal Sampling—The processor continues to sample INIT,

INTR, NMI, RESET, and SMI#.

After entering the Halt state, all signals driven by the processor

retain their state as they existed following the completion of

the Halt special cycle.

Exit Halt State

The AMD-K6-2E processor remains in the Halt state until it

samples INIT, INTR (if interrupts are enabled), NMI, RESET, or

SMI# asserted. If any of these signals is sampled asserted, the

processor returns to the Normal state and performs the

corresponding operation. All of the normal requirements for

recognition of these input signals apply within the Halt state.

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