W83194R-37/-58 Winbond Electronics Corp America, W83194R-37/-58 Datasheet - Page 8

• Manufacturer Part Number: W83194R-37/-58
• Description: 100MHz/133MHz Via MVP3, Via Apollo Pro Clock Gen., 3-DIMM, With S.S.T.
• Manufacturer: Winbond Electronics Corp America

Bytes sequence order for I
Set R/W to 1 when read back the data sequence is as follows :
8.3 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.
that,
acknowledged.
8.3.1 Register 0: CPU Frequency Select Register
Bit
Clock Address
A(6:0) & R/W
Clock Address
A(6:0) & R/W
7
6
5
4
3
2
1
0
the below described sequence (Register 0, Register 1, Register 2, ....) will be valid and
@PowerUp
- 8 -
0
0
0
0
0
0
0
0
Ack
Ack
2
C controller :
8 bits dummy
Command code
Pin
-
-
-
-
-
-
-
-
Byte 0
0 = ±1.5% Spread Spectrum Modulation
1 = ±0.5% Spread Spectrum Modulation(W83194R-37)
0 = ±0.25% Spread Spectrum Modulation
1 = ±0.5% Spread Spectrum Modulation(W83194R-58)
SSEL2 ( Frequency table selection by software via I
SSEL1 ( Frequency table selection by software via I
SSEL0 ( Frequency table selection by software via I
0 = Selection by hardware
1 = Selection by software I
SSEL3 (Frequency table selection by software via I
W83194R-58)
0 = Normal
1 = Spread Spectrum enabled
0 = Running
1 = Tristate all outputs
Ack
Ack
8 bits dummy
Byte count
Byte 1
Description
2
C - Bit 6:4
Publication Release Date: Sep 1998
Ack
Ack
Byte0,1,2...
until Stop
Byte2, 3, 4...
until Stop
2
2
2
C)
C)
C)
Revision 1.0
2
C for
After