ICS9248-81 Datasheet, PDF (10/18 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers

ICS9248 -81
PCI_STOP# Timing Diagram
PCI_STOP# is an synchronous input to the ICS9248-81. It is used to turn off the PCICLK (0:4) clocks for low power operation.
PCI_STOP# is synchronized by the ICS9248-81 internally. The minimum that the PCICLK (0:4) clocks are enabled
(PCI_STOP# high pulse) is at least 10 PCICLK (0:4) clocks. PCICLK (0:4) clocks are stopped in a low state and started with
a full high pulse width guaranteed. PCICLK (0:4) 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 ICS9248 device.)
2. PCI_STOP# is an asynchronous input, and metastable conditions may exist. This signal is required to be synchronized
inside the ICS9248.
3. All other clocks continue to run undisturbed.
4. CPU_STOP# is shown in a high (true) state.
10