ICS9248-199 Datasheet, PDF (19/21 Pages) Integrated Circuit Systems – Frequency Generator for SIS 735/740 with AMD K7 Processor

ICS9248-199
SDRAM_STOP# Timing Diagram
SDRAM_STOP# is an asychronous input to the clock synthesizer. It is used to stop SDRAM clocks for low power
operation. SDRAM_STOP# is synchronized to complete it's current cycle, by the ICS9248-199. All other clocks will
continue to run while the SDRAM clocks are disabled. The SDRAM 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.
Notes:
1. All timing is referenced to the internal CPU clock.
2. SDRAM is an asynchronous input and metastable conditions may exist. This signal is
synchronized to the SDRAM clocks inside the ICS9248-199.
3. All other clocks continue to run undisturbed.
0376E—12/23/02
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