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PI6C673FA

133 MHz Single Chip Mobile Clock Supports 440 BX™/VIAPromedia™ Chipset with Pentium II™/Pentium III™/Celeron™

Pericom Semiconductor 

PI6C673F 133 MHz Single Chip Mobile Clock

Supports 440BX™/ VIA Promedia™ Chipset

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Byte 0: Functional and Frequency Select Clock Register (1 = enable, 0 = disable)

Bit

Pin # Power-Up Default

Description

Bit 7

N/A

Bit 6

N/A

Bit 5

N/A

Bit 4

N/A

Bit 3

22

Bit 2

23

Bit 1

N/A

Bit 0

N/A

X

(Reserved)

1

Spread Spectrum Selection bit SSC2

1

Spread Spectrum Selection bit SSC1

1

Spread Spectrum Selection bit SSC0

1

48/24 MHzA (Freq Select) 1=48MHz, 0=24 MHz

1

48/24 MHzB (Freq Select) 1=48MHz, 0=24 MHz

Bit1 Bit 0

0

0

1 1 : Tri-State (all outputs)

1 0 : Spread Spectrum enabled

0 1 : Test mode (see table)

0 0 : Non-Spread Spectrum Operating Mode

Spread Spectrum Bandwidth Selection Table

SSC2 SSC1 SSC0 Bandwidth

Direction

0

0

0

±0.625%

Center

0

0

1

±0.5%

Center

0

1

0

–0.35%

Down

0

1

1

–0.25%

Down

1

0

0

–2.5%

Down

1

0

1

–1%

Down

1

1

0

–1.21%

Down

1

1

1

–0.9%

Down (default)

Test Mode Selection

S1

S0

CPU

PCI, PCI_F REF

24 MHz

0

0

TCLK/4

TCLK/8

TCLK TCLK/4

0

1 TCLK/4 TCLK/8 TCLK TCLK/4

1

0

TCLK/4 TCLK/12 TCLK TCLK/4

1

1 TCLK/4 TCLK/12 TCLK TCLK/4

Note:

TCLK is a test clock over driven on the XTAL_IN input during test mode.

48 MHz

TCLK/2

TCLK/2

TCLK/2

TCLK/2

4

PS8400B

05/01/00

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