PI6C102 Просмотр технического описания (PDF) - Pericom Semiconductor

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PI6C102

Precision Clock Synthesizer for Mobile PCs

Pericom Semiconductor 

PI6C102

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PCI_STOP# is an input signal used to turn off PCI clocks for low started with a guaranteed full high pulse width. There is ONLY one

power operation. PCI clocks are stopped in the LOW state and rising edge of external PCICLK after the clock control logic.

CPUCLK

(Internal)

PCICLK

(Internal)

PCICLK_F

(Free-running)

CPU_STOP#

PCI_STOP#

PWR_DWN#

PCICLK

(External)

PCI_STOP# Timing Diagram

Notes:

1. All timing is referenced to the CPUCLK.

2. PCI_STOP# signal is an input signal which must be made synchronous to PCI_F output.

3 Internal means inside the chip.

4. All other clocks continue to run undisturbed.

5. PWR_DWN# and CPU_STOP# are shown in a high state.

6. Diagrams shown with respect to 66 MHz. Similar operation as CPU = 100 MHz.

The PWR_DWN# is used to place the device in a very low power Thepower-onlatencyislessthan3ms.PCI_STOP#andCPU_STOP#

state. PWR_DWN# is an asynchronous active low input. Internal are “don’t cares” during the power-down operations. The REF clock

clocks are stopped after the device is put in power-down mode. is stopped in the LOW state as soon as possible.

CPUCLK

(Internal)

PCICLK

(Internal)

PWR_DWN#

CPUCLK

(External)

PCICLK

(External)

VCO

Crystal

Notes:

PWR_DWN# Timing Diagram

1. All timing is referenced to the CPUCLK.

2. The Internal label means inside the chip and is a reference only.

3. PWR_DWN# is an asynchronous input and metastable conditions could exist. The signal is synchronized inside the part.

4. The shaded sections on the VCO and the Crystal signals indicate an active clock.

5. Diagrams shown wth respect to 66 MHz. Similar operation as CPU = 100 MHz.

4

PS8164A

09/29/00

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