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W144 - 440BX AGPset Spread Spectrum Frequency Synthesizer

Datasheet Summary

Description

Free-running CPU Clock: Output voltage swing is controlled by the voltage applied to VDDQ2.

See Tables 2 and 6 for detailed frequency information.

CPU Clock Output 1: This CPU clock output is controlled by the CLK_STOP# control pin.

Features

  • Maximized EMI suppression using Cypress’s Spread Spectrum technology.
  • Single chip system frequency synthesizer for Intel® 440BX AGPset.
  • Two copies of CPU output.
  • Six copies of PCI output.
  • One 48-MHz output for USB.
  • One 24-MHz output for SIO.
  • Two buffered reference outputs.
  • One IOAPIC output.
  • Thirteen SDRAM outputs provide support for 3 DIMMs.
  • Supports frequencies up to 150 MHz.
  • I2C™ interface for.

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Datasheet Details

Part number W144
Manufacturer Cypress Semiconductor
File Size 155.90 KB
Description 440BX AGPset Spread Spectrum Frequency Synthesizer
Datasheet download datasheet W144 Datasheet
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Full PDF Text Transcription

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PRELIMINARY W144 440BX AGPset Spread Spectrum Frequency Synthesizer Features • Maximized EMI suppression using Cypress’s Spread Spectrum technology • Single chip system frequency synthesizer for Intel® 440BX AGPset • Two copies of CPU output • Six copies of PCI output • One 48-MHz output for USB • One 24-MHz output for SIO • Two buffered reference outputs • One IOAPIC output • Thirteen SDRAM outputs provide support for 3 DIMMs • Supports frequencies up to 150 MHz • I2C™ interface for programming • Power management control inputs Table 1. Mode Input Table Mode 0 1 PCI_STOP# REF0 Pin2 Table 2. Pin Selectable Frequency FS3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 Input Address CPU_F, CPU1 FS2 FS1 FS0 (MHz) PCI_F, 1:5 (MHz) 1 1 1 133.3 33.3 (CPU/4) 1 1 0 124 31 (CPU/4) 1 0 1 150 37.
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