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參數(shù)資料
型號(hào): W83195R-08
廠商: WINBOND ELECTRONICS CORP
元件分類: XO, clock
英文描述: 150MHZ 4-DIMM Clock(頻率為150MHZ、3-DIMM 時(shí)鐘)
中文描述: 150 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56
封裝: SSOP-56
文件頁(yè)數(shù): 7/18頁(yè)
文件大?。?/td> 230K
代理商: W83195R-08
W83195R-08
PRELIMINARY
Publication Release Date: Mar. 1999
Revision 0.30
- 7 -
Bytes sequence order for I
2
C controller :
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
Ack
Byte2, 3, 4...
until Stop
Byte 1
8.3 SERIAL CONTROL REGISTERS
The Pin column lists the affected pin number and the PowerUp column gives the default state at 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 sequence described below (Register 0, Register 1,
Register 2, ....) will be valid and acknowledged.
8.3.1 Register 0: CPU Frequency Select Register (default = 0)
Bit
@PowerUp
Pin
Description
7
0
-
0 =
ó
0.25% Spread Spectrum Modulation
1 =
ó
0.5% Spread Spectrum Modulation
SSEL2 (for frequency table selection by software via I
2
C)
SSEL1 (for frequency table selection by software via I
2
C)
SSEL0 (for frequency table selection by software via I
2
C)
0 = Selection by hardware
1 = Selection by software I
2
C - Bit 6:4, 2
SSEL3 (for frequency table selection by software via I
2
C)
0 = Normal
1 = Spread Spectrum enabled
0 = Running
1 = Tristate all outputs
6
0
-
5
0
-
4
3
0
0
-
-
2
1
0
0
-
-
0
0
-
Note : The frequency table selected by software via I
2
C is the same as the hardware setting
frequency table.
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