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W195B - Frequency Generator for Integrated Core Logic

General Description

Reference Clock with 2x Drive/Frequency Select 3: 3.3V 14.318-MHz clock output.

This pin also serves as the select strap to determine device operating frequency as described in Table 1.

Crystal Input: This pin has dual functions.

Key Features

  • Maximized EMI suppression using Cypress’s Spread Spectrum Technology.
  • Low jitter and tightly controlled clock skew.
  • Highly integrated device providing clocks required for CPU, core logic, and SDRAM.
  • Two copies of CPU clocks.
  • Nine copies of SDRAM clocks.
  • Eight copies of PCI clock.
  • One copy of synchronous APIC clock.
  • Two copies of 66-MHz outputs.
  • Two copies of 48-MHz outputs.
  • One copy of selectable 24- or 48.

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Full PDF Text Transcription for W195B (Reference)

Note: Below is a high-fidelity text extraction (approx. 800 characters) for W195B. For precise diagrams, and layout, please refer to the original PDF.

PRELIMINARY W195B Frequency Generator for Integrated Core Logic Features • Maximized EMI suppression using Cypress’s Spread Spectrum Technology • Low jitter and tightly c...

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using Cypress’s Spread Spectrum Technology • Low jitter and tightly controlled clock skew • Highly integrated device providing clocks required for CPU, core logic, and SDRAM • Two copies of CPU clocks • Nine copies of SDRAM clocks • Eight copies of PCI clock • One copy of synchronous APIC clock • Two copies of 66-MHz outputs • Two copies of 48-MHz outputs • One copy of selectable 24- or 48-MHz clock • One copy of double strength 14.31818-MHz reference clock • Power-down control • I2C interface for turning off unused clocks SDRAM, APIC, 48MHz Output Skew: ........................ 250 ps PCI Output Skew: ...................

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