W83194R-58A Winbond, W83194R-58A Datasheet - Page 7

• Manufacturer Part Number: W83194R-58A
• Description: 100MHZ AGP CLOCK FOR VIA CHIPSET
• Manufacturer: Winbond

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.
After that, the below described sequence (Register 0, Register 1, Register 2, ....) will be valid and
acknowledged.
8.3.1 Register 0: CPU Frequency Select Register
Bit
7
6
5
4
3
2
1
0
@PowerUp
0
0
0
0
0
0
0
0
Pin
-
-
-
-
-
-
-
-
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
- 7 -
Description
2
C - Bit 6:4
Publication Release Date: Nov. 1999
W83194R-58A
PRELIMINARY
2
2
2
Revision 0.30
C)
C)
C)
2
C for