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W133 - Spread Spectrum System Frequency Synthesizer

General Description

CPU Clock Outputs 0 through 3: These four CPU clocks run at a frequency set by SEL133/100#.

Output voltage swing is set by the voltage applied to VDDQ2.

Synchronous Memory Reference Clock Output 0 through 1: Reference clock for Direct RDRAM clock generators running at 1/2 CPU clock frequency.

Key Features

  • Maximized EMI suppression using Cypress’s spread spectrum technology.
  • Intel CK98 Specification compliant.
  • 0.5% downspread outputs deliver up to 10 dB lower EMI.
  • Four skew-controlled copies of CPU output.
  • Eight copies of PCI output (synchronous w/CPU output).
  • Four copies of 66-MHz fixed frequency 3.3V clock.
  • Two copies of CPU/2 outputs for synchronous memory reference.
  • Three copies of 16.67-MHz IOAPIC clock, synchronous to C.

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Full PDF Text Transcription for W133 (Reference)

Note: Below is a high-fidelity text extraction (approx. 800 characters) for W133. For precise diagrams, and layout, please refer to the original PDF.

PRELIMINARY W133 Spread Spectrum System Frequency Synthesizer Features • Maximized EMI suppression using Cypress’s spread spectrum technology • Intel CK98 Specification c...

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sing Cypress’s spread spectrum technology • Intel CK98 Specification compliant • 0.5% downspread outputs deliver up to 10 dB lower EMI • Four skew-controlled copies of CPU output • Eight copies of PCI output (synchronous w/CPU output) • Four copies of 66-MHz fixed frequency 3.3V clock • Two copies of CPU/2 outputs for synchronous memory reference • Three copies of 16.67-MHz IOAPIC clock, synchronous to CPU clock • One copy of 48-MHz USB output • Two copies of 14.31818-MHz reference clock • Programmable to 133- or 100-MHz operation • Power management control pins for clock stop and shut down • Available in 56-pin SSOP CPU O

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