AMD-K6 AMD [Advanced Micro Devices], AMD-K6 Datasheet - Page 242
AMD-K6
Manufacturer Part Number
AMD-K6
Description
AMD-K6 Processor
Manufacturer
AMD [Advanced Micro Devices]
Datasheet
1.AMD-K6.pdf
(346 pages)
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AMD-K6
12.1
Enter Halt State
Exit Halt State
224
®
Processor Data Sheet
Halt State
During the execution of the HLT instruction, the AMD-K6
processor executes a Halt special cycle. After BRDY# is
sampled asserted during this cycle, and then EWBE# is also
sampled asserted, the processor enters the Halt state in which
the processor disables most of its internal clock distribution. In
order to support the following operations, the internal
phase-lock loop (PLL) still runs, and some internal resources
are still clocked in the Halt state:
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.
The AMD-K6 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.
Inquire Cycles: The processor continues to sample AHOLD,
BOFF#, and HOLD in order 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#.
Preliminary Information
Clock Control
20695H/0—March 1998
Chapter 12
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