ICS94241 Datasheet, PDF(5/16 Page) Integrated Circuit Systems – Programmable TCH™ for Differential PIII™ Processor

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ICS94241 Datasheet, PDF (5/16 Pages) Integrated Circuit Systems – Programmable TCH™ for Differential PIII™ Processor

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ICS94241

Byte 0: Functionality and frequency select register (Default=0)

Bit

2, (7:4)

Bit 3

Bit 1

Bit 0

Description

Bit2

FS4

Bit7

FS3

Bit6

FS2

Bit5

FS1

Bit4

FS0

CPUCLK

PCICLK

Spread Percentage

0 0 0 0 0 66.67 33.33 Center Spread +/- 0.25%

0 0 0 0 1 66.67 33.33 Down Spread 0 to - 0.5%

0 0 0 1 0 68.67 34.33 Center Spread +/- 0.25%

0 0 0 1 1 71.34 35.66 Center Spread +/- 0.25%

0 0 1 0 0 73.34 36.66 Center Spread +/- 0.25%

0 0 1 0 1 76.67 38.33 Center Spread +/- 0.25%

0 0 1 1 0 150.00 30.00 Center Spread +/- 0.25%

0 0 1 1 1 166.67 33.33 Center Spread +/- 0.25%

0 1 0 0 0 100.00 33.33 Center Spread +/- 0.25%

0 1 0 0 1 100.00 33.33 Down Spread 0 to - 0.5%

0 1 0 1 0 103.00 34.33 Center Spread +/- 0.25%

0 1 0 1 1 107.00 35.67 Center Spread +/- 0.25%

0 1 1 0 0 110.00 36.67 Center Spread +/- 0.25%

0 1 1 0 1 115.00 38.33 Center Spread +/- 0.25%

0 1 1 1 0 100.90 33.63 Center Spread +/- 0.25%

0 1 1 1 1 90.00 30.00 Center Spread +/- 0.25%

1 0 0 0 0 200.00 33.33 Center Spread +/- 0.25%

1 0 0 0 1 200.00 33.33 Down Spread 0 to - 0.5%

1 0 0 1 0 206.00 34.33 Center Spread +/- 0.25%

1 0 0 1 1 214.00 35.67 Center Spread +/- 0.25%

1 0 1 0 0 220.00 36.67 Center Spread +/- 0.25%

1 0 1 0 1 230.00 38.33 Center Spread +/- 0.25%

1 0 1 1 0 201.80 33.63 Center Spread +/- 0.25%

1 0 1 1 1 180.00 30.00 Center Spread +/- 0.25%

1 1 0 0 0 133.33 33.33 Center Spread +/- 0.25%

1 1 0 0 1 133.33 33.33 Down Spread 0 to - 0.5%

1 1 0 1 0 137.33 34.33 Center Spread +/- 0.25%

1 1 0 1 1 142.67 35.67 Center Spread +/- 0.25%

1 1 1 0 0 146.67 36.67 Center Spread +/- 0.25%

1 1 1 0 1 153.33 38.33 Center Spread +/- 0.25%

1 1 1 1 0 133.90 33.48 Center Spread +/- 0.25%

1 1 1 1 1 120.00 30.00 Center Spread +/- 0.25%

0=Frequency selected by hardware; 1=Frequency selected by Bit2, (7:4)

0=Spread off; 1=Spread Spectrum Enable

0=Running; 1=Tristate

PWD

Note 1

Notes:

1. Default at power-up will be for latched logic inputs to define frequency, as displayed by Bit 3.

0453Câ10/26/04

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