ICS9148-58 Datasheet, PDF (7/14 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for PENTIUM/ProTM

ICS9148 - 58
PCI_STOP# Timing Diagram
PCI_STOP# is an asynchronous input to the ICS9148-58. It is used to turn off the PCICLK (0:5) clocks for low power operation.
PCI_STOP# is synchronized by the ICS9148-58 internally. The minimum that the PCICLK (0:5) clocks are enabled (PCI_STOP#
high pulse) is at least 10 PCICLK (0:5) clocks. PCICLK (0:5) clocks are stopped in a low state and started with a full high pulse
width guaranteed. PCICLK (0:5) clock on latency cycles are only one rising PCICLK clock off latency is one PCICLK clock.
Notes:
1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS9148 device.)
2. PCI_STOP# is an asynchronous input, and metastable conditions may exist. This signal is required to be synchronized
inside the ICS9148.
3. All other clocks continue to run undisturbed.
4. CPU_STOP# is shown in a high (true) state.
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