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W83194BR-640

166MHZ CLOCK FOR SIS CHIPSET

Winbond 

W83194BR-640

Clock Address

A(6:0) & R/W

Ack

8 bits dummy

Command code

Ack

8 bits dummy

Byte count

Ack

Byte0,1,2...

until Stop

Set R/W to 1 when read back the data sequence is as follows, [1101 0011] :

Clock Address

A(6:0) & R/W

Ack

Byte 0

Ack

Byte 1

Ack

Byte2, 3, 4...

until Stop

6.2 SERIAL CONTROL REGISTERS

The Pin column lists the affected pin number and the @PowerUp column gives the state at true power

up. Registers are set to the values shown only on true power up. "Command Code" byte and "Byte

Count" byte must be sent following the acknowledge of the Address Byte. Although the data (bits) in

these two bytes are considered "don't care", they must be sent and will be acknowledge. After that,

the below described sequence (Register 0, Register 1, Register 2, ....) will be valid and acknowledged.

6.2.1 Register 4: CPU Frequency Select Register (default = 0)

Bit @PowerUp

7

0

6

0

5

0

4

0

3

0

2

0

1

0

0

0

Pin

Description

-

SSEL3 (for frequency table selection by software via I2C)

-

SSEL2 (for frequency table selection by software via I2C)

-

SSEL1 (for frequency table selection by software via I2C)

-

SSEL0 (for frequency table selection by software via I2C)

-

0 = Selection by hardware

1 = Selection by software I2C - Bit 1,2, 7:4

-

SSEL4 (for frequency table selection by software via I2C)

-

SSEL5 (for frequency table selection by software via I2C)

-

0 = Running

1 = Tri-state all outputs

Publication Release Date: April. 2001

-7-

Revision 1.0

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