AMD-K6-2ESLASH233AMZ datasheet(268/332 Pages) AMD

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Clock Control

Chapter 13

AMD-K6™-2E Processor Data Sheet

22529B/0—January 2000

Preliminary Information

13.3

Stop Grant State

Enter Stop Grant

State

After recognizing the assertion of STPCLK#, the AMD-K6-2E

processor flushes its instruction pipelines, completes all

pending and in-progress bus cycles, and acknowledges the

STPCLK# assertion by executing a Stop Grant special bus cycle.

After BRDY# is sampled asserted during this cycle, and after

EWBE# is also sampled asserted (if not masked off), the

processor enters the Stop Grant state.

The Stop Grant state is like the Halt state in that the processor

disables most of its internal clock distribution in the Stop Grant

state.

In order to support the following operations, the internal PLL

still runs, and some internal resources are still clocked in the

Stop Grant state:

Inquire cycles—The processor transitions to the Stop Grant

Inquire state during an inquire cycle. After returning to the

Stop Grant state following the inquire cycle, the processor

does not execute another Stop Grant special cycle.

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

the Stop Grant state.

Signal Sampling—The processor continues to sample INIT,

INTR, NMI, RESET, and SMI#.

FLUSH# is not recognized in the Stop Grant state (unlike while

in the Halt state).

Upon entering the Stop Grant state, all signals driven by the

processor retain their state as they existed following the

completion of the Stop Grant special cycle.

Exit Stop Grant State

The AMD-K6-2E processor remains in the Stop Grant state until

it samples STPCLK# negated or RESET asserted. If STPCLK#

is sampled negated, the processor returns to the Normal state in

less than 10 bus clock (CLK) periods. After the transition to the

Norm al state, the processor re su mes executio n at the

instruction boundary on which STPCLK# wa s initially

recognized.

If STPCLK# is recognized as negated in the Stop Grant state

and subsequently sampled asserted prior to returning to the

AMD-K6-2E/233AMZ Datasheet(PDF) 268 Page - Advanced Micro Devices

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