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W83194R-81

100MHZ CLOCK FOR SIS CHIPSET

Winbond 

W83194R-81

PRELIMINARY

8.3.1 Register 0: CPU Frequency Select Register

Bit @PowerUp

7

0

6

0

5

0

4

0

3

0

2

0

Pin

Description

-

0 = ¡Ó0.25% Spread Spectrum Modulation

1 = ¡Ó0.5% Spread Spectrum Modulation

-

SSEL2 ( Frequency table selection by software via I2C)

-

SSEL1 ( Frequency table selection by software via I2C)

-

SSEL0 ( Frequency table selection by software via I2C)

-

0 = Selection by hardware

1 = Selection by software I2C - Bit 6:4 and Bit2

-

SSEL3 (Frequency table selection by software via I2C )

1

0

-

0 = Normal

1 = Spread Spectrum enabled

0

0

-

0 = Running

1 = Tristate all outputs

Frequency table selection by software via I2C

SSEL3

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

SSEL2

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

1

SSEL1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

SSEL0

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

CPU

(MHz)

66.70

90

95.25

100.2

100

112

124

133.3

66.8

75

83.3

95.25

100.2

112

124

133.3

SDRAM

(MHz)

100.05

90

63.4

66.8

75

74.7

82.7

88.9

66.8

75

83.3

95.25

100.2

112

124

133.3

PCI

(MHz)

33.35

30

31.7

33.4

30

37.3

31

33.3

33.4

30

33.32

31.7

33.4

37.3

31

33.3

REF (MHz)

IOAPIC

14.318

14.318

14.318

14.318

14.318

14.318

14.318

14.318

14.318

14.318

14.318

14.318

14.318

14.318

14.318

14.318

Publication Release Date: Dec. 1998

-9-

Revision 0.20

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