w83193r-01 Winbond Electronics Corp America, w83193r-01 Datasheet - Page 7

• Manufacturer Part Number: w83193r-01
• Description: 83.mhz 3-dimm Clock
• Manufacturer: Winbond Electronics Corp America

Bytes sequence order for I
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)
FUNCTION TABLE
Description
Bit
Function
Clock Address
A(6:0) & R/W
Tri-State
7
6
5
4
3
2
1
0
Normal
@PowerUp
1
1
1
1
0
x
0
0
see table
Ack
CPU
Hi-Z
2
C controller :
8 bits dummy
Command code
Pin
n/a
-
-
-
-
-
-
see table
FTS(for frequency table selection by software via I
FS2 (for frequency table selection by software via I
FS1 (for frequency table selection by software via I
FS0 (for frequency table selection by software via I
0 = Selection by hardware
1 = Selection by software I
Reserved
Bit1 Bit0
1 1 Tri-state all outputs
1 0
0 1
0 0 Normal
Hi-Z
PCI
0.6% Spread Spectrum
1.5% Spread Spectrum
Ack
- 7 -
Outputs
SDRAM
8 bits dummy
Byte count
CPU
Hi-Z
Description
2
C
Publication Release Date: May 1998
14.318
REF
Hi-Z
Ack
W83193R-01
Byte0,1,2...
until Stop
PRELIMINARY
IOAPIC
14.318
Hi-Z
2
2
2
2
C)
C)
C)
C)
Revision 0.20