ICS9248YF-127-T View Datasheet(PDF) - Integrated Circuit Systems

Part Name

Description

MFG CO.

ICS9248YF-127-T

Frequency Generator & Integrated Buffers for PENTIUM/Pro™

Integrated Circuit Systems 

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ICS9248 - 127

PCI_STOP# Timing Diagram

PCI_STOP# is an asynchronous input to the ICS9248-127. It is used to turn off the PCICLK [4:0] clocks for low power

operation. PCI_STOP# is synchronized by the ICS9248-127 internally. The minimum that the PCICLK [4:0] clocks are

enabled (PCI_STOP# high pulse) is at least 10 PCICLK [4:0] clocks. PCICLK [4:0] clocks are stopped in a low state and started

with a full high pulse width guaranteed. PCICLK [4:0] clock on latency cycles are only one rising PCICLK clock off latency

is one PCICLK clock.

CPUCLK

(Internal)

PCICLK_F

(Internal)

PCICLK_F

(Free-running)

CPU_STOP#

PCI_STOP#

PCICLK

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. CPU_STOP# is shown in a high (true) state.

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