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W196 - Spread Spectrum FTG for 440BX and VIA Apollo Pro-133

Datasheet Summary

Description

CPU Clock Outputs 0 through 1: These two CPU clocks run at a frequency set by FS0:1 or the serial data interface.

See Table 1 and Table 5.

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

Features

  • Maximized EMI suppression using Cypress’s Spread Spectrum Technology.
  • System frequency synthesizer for 440BX, 440ZX, and VIA Apollo Pro-133.
  • I2C programmable to 155 MHz (32 selectable frequencies).
  • Two skew-controlled copies of CPU output.
  • Seven copies of PCI output (synchronous w/CPU output).
  • One copy of 14.31818-MHz IOAPIC output.
  • One copy of 48-MHz USB output.
  • Selectable 24-/48-MHz clock is determined by resistor straps.

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Datasheet Details

Part number W196
Manufacturer Cypress Semiconductor
File Size 138.51 KB
Description Spread Spectrum FTG for 440BX and VIA Apollo Pro-133
Datasheet download datasheet W196 Datasheet
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Full PDF Text Transcription

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PRELIMINARY W196 Spread Spectrum FTG for 440BX and VIA Apollo Pro-133 Features • Maximized EMI suppression using Cypress’s Spread Spectrum Technology • System frequency synthesizer for 440BX, 440ZX, and VIA Apollo Pro-133 • I2C programmable to 155 MHz (32 selectable frequencies) • Two skew-controlled copies of CPU output • Seven copies of PCI output (synchronous w/CPU output) • One copy of 14.31818-MHz IOAPIC output • One copy of 48-MHz USB output • Selectable 24-/48-MHz clock is determined by resistor straps on power up • One high-drive output buffer that produces a copy of the 14.318-MHz reference • Isolated core VDD pin for noise reduction CPU Cycle to Cycle Jitter: .......................................... 250 ps CPU, PCI Output Edge Rate: .........................................
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