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W83193R-01

83.MHZ 3-DIMM CLOCK

Winbond 

W83193R-01

Bytes sequence order for I2C controller :

PRELIMINARY

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

7.3 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.

7.3.1 Register 0: CPU Frequency Select Register (1 = enable, 0 = Stopped)

Bit @PowerUp

7

1

6

1

5

1

4

1

3

0

2

x

1

0

0

0

Pin

Description

-

FTS(for frequency table selection by software via I2C)

-

FS2 (for frequency table selection by software via I2C)

-

FS1 (for frequency table selection by software via I2C)

-

FS0 (for frequency table selection by software via I2C)

-

0 = Selection by hardware

1 = Selection by software I2C

n/a Reserved

-

Bit1 Bit0

1 1 Tri-state all outputs

1 0 ±0.6% Spread Spectrum

0 1 ±1.5% Spread Spectrum

0 0 Normal

FUNCTION TABLE

Function

Description

Tri-State

Normal

CPU

Hi-Z

see table

PCI

Hi-Z

see table

Outputs

SDRAM

Hi-Z

CPU

REF

Hi-Z

14.318

IOAPIC

Hi-Z

14.318

Publication Release Date: May 1998

-7-

Revision 0.20

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