ics9248-98 Integrated Device Technology, ics9248-98 Datasheet - Page 7

• Manufacturer Part Number: ics9248-98
• Description: Frequency Generator & Integrated Buffers For Celeron & Pii/iii
• Manufacturer: Integrated Device Technology

0313F—08/04/04
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.
CLK_STOP# Timing Diagram
CLK_STOP# is an asychronous input to the clock synthesizer. It is used to turn off the CPU clocks for low power
operation. CLK_STOP# is synchronized by the ICS9248-98. The minimum that the CPU clock is enabled (CLK_STOP#
Notes:
1. All timing is referenced to the internal CPU clock.
2. CLK_STOP# is an asynchronous input and metastable conditions may exist. This signal is
3. IOAPIC output is Stopped Glitch Free by CLK_STOP# going low.
4. SDRAM-F output is controlled by Buffer in signal, not affected by the ICS9248-98
5. All other clocks continue to run undisturbed.
synchronized to the CPU clocks inside the ICS9248-98.
CLK_STOP# signal. SDRAM's are controlled as shown.
PCI_STOP# (High)
CLK_STOP#
CPUCLK _F
INTERNAL
SDRAM_F
CPUCLK
CPUCLK
PCICLK
SDRAM
IOAPIC
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ICS9248-98