ICS9148-03 查看數據表（PDF） - Integrated Circuit Systems

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ICS9148-03

Frequency Generator & Integrated Buffers for PENTIUM/Pro™

Integrated Circuit Systems 

ICS9148 - 03

CPU_STOP# Timing Diagram

CPU_STOP# is an asychronous input to the clock synthesizer. It is used to turn off the CPU clocks for low power

operation. CPU_STOP# is synchronized by the ICS9148-03. The minimum that the CPU clock is enabled (CPU_STOP#

high pulse) is 100 CPU clocks. All other clocks will continue to run while the CPU clocks are disabled. The CPU clocks

will always be stopped in a low state and start in such a manner that guarantees the high pulse width is a full pulse. CPU

clock on latency is less than 4 CPU clocks and CPU clock off latency is less than 4 CPU clocks.

Notes:

1. All timing is referenced to the internal CPU clock.

2. CPU_STOP# is an asynchronous input and metastable conditions may exist. This signal

is synchronized to the CPU clocks inside the ICS9148-03.

3. All other clocks continue to run undisturbed.

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