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AV9248F-61

Frequency Timing Generator for Pentium II Systems

Integrated Circuit Systems 

ICS9248-61

CPU_STOP# Timing Diagram

CPUSTOP# is an asychronous input to the clock synthesizer. It is used to turn off the CPUCLKs for low power operation.

CPU_STOP# is synchronized by the ICS9248-61. The minimum that the CPUCLK is enabled (CPU_STOP# high pulse) is 100

CPUCLKs. All other clocks will continue to run while the CPUCLKs are disabled. The CPUCLKs will always be stopped in a low

state and start in such a manner that guarantees the high pulse width is a full pulse. CPUCLK on latency is less than 4 CPUCLKs

and CPUCLK off latency is less than 4 CPUCLKs.

Notes:

1. All timing is referenced to the internal CPUCLK.

2. CPU_STOP# is an asynchronous input and metastable conditions may exist. This signal is synchronized to the CPUCLKs inside

the ICS9248-61.

3. All other clocks continue to run undisturbed.

4. PD# and PCI_STOP# are shown in a high (true) state.

PCI_STOP# Timing Diagram

PCI_STOP# is an asynchronous input to the ICS9248-61. It is used to turn off the PCICLK (0:4) clocks for low power operation.

PCI_STOP# is synchronized by the ICS9248-61 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. PD# and CPU_STOP# are shown in a high (true) state.

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