ICS9248-185 데이터 시트보기 (PDF) - Integrated Circuit Systems

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ICS9248-185

Frequency Generator & Integrated Buffers for PENTIUM/Pro™ & K6

Integrated Circuit Systems 

ICS9248 - 185

PCI_STOP# Timing Diagram

PCI_STOP# is an asynchronous input to the ICS9248-185. It is used to turn off the PCICLK clocks for low power operation.

PCI_STOP# is synchronized by the ICS9248-185 internally. The minimum that the PCICLK clocks are enabled (PCI_STOP#

high pulse) is at least 10 PCICLK clocks. PCICLK clocks are stopped in a low state and started with a full high pulse width

guaranteed. PCICLK clock on latency cycles are only three rising PCICLK clocks, off latency is one PCICLK clock.

CPUCLK

(Internal)

PCICLK_F

(Internal)

PCICLK_F

(Free-running)

CLK_STOP#

PCI_STOP#

PCICLK [6:0]

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

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