W158H(1999) View Datasheet(PDF) - Cypress Semiconductor

Part Name

Description

View to exact match

W158H
(Rev.:1999)

Spread Spectrum System Frequency Synthesizer

Cypress Semiconductor 

Timing Diagrams (continued)

PCI_STOP# Timing Diagram[18, 22, 23, 24, 25, 26]

CPU

PCI

(internal)

PCI_STOP#

CPU_STOP#

HI

PWRDWN#

HI

PCI_F

(external)

PCI

(external)

PWRDWN# Timing Diagram[18, 22, 23, 27, 28]

CPU

(internal)

PCI

(internal)

PWRDWN#

CPU

(external)

PCI

(external)

VCO

Crystal

Notes:

23. All internal timing is referenced to the CPU clock.

24. PCI_STOP# signal is an input signal that must be made synchronous to PCI_F output.

25. All other clocks continue to run undisturbed.

26. PWRDWN# and CPU_STOP# are shown in a HIGH state.

27. PWRDWN is an asynchronous input and metastable conditions could exist. This signal must be synchronized.

28. The shaded Sections on the VCO and the Crystal signals indicate an active clock.

W158

6

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