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參數(shù)資料
| 型號(hào)： | C9630CY |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類(lèi)： | XO, clock |
| 英文描述： | PC133 Clock Generator for SiS630/Pentium III & SiS540/Socket7 Applications |
| 中文描述： | 150 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | SSOP-48 |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大?。?/td> | 185K |
| 代理商： | C9630CY |
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PC133 Clock Generator for SiS630/Pentium
III & SiS540/Socket7 Applications
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07035 Rev. **
05/02/2001
Page 9 of 18
APPROVED PRODUCT
C9630
Dial-a-Frequency
Feature (Cont.)
Since this N number must be entered in Binary, it can only be an integer, so it must be rounded up or down. Here we
can rounded it up to 71, which will give us an exact CPU frequency of:
Fcpu = 96016000 X N = 145.045 MHz (accuracy + 310 ppm)
47
If the above frequency is not accurate enough, then you must choose another R value and start from the beginning. For
example choose R = 49 and this will yield an N = 73.99808365, which is rounded to 74. If the 74 is applied in the
formula 1, then Fcpu = 145.0038 MHz (accuracy + 26 ppm).
Other R values within the above limits may also be evaluated.
SMBus Communication Waveform
START
IMI Device
Master Device
STOP CONDITION
START CONDITION
IMI Device
Master Device
STOP CONDITION
1
8
ACK
MSB
0
0
0
SDATA
0
1
LSB
COMMAND BYTE
1
SCLK
1
BYTE N
8
8
8
BYTE 0
BYTE COUNT
ACK
ACK
ACK
ACK
(Don
’
t Care)
(Don
’
t Care)
(Valid)
(Valid)
Fig.6a
(WRITE)
(Valid)
SDATA
1
0
(Valid)
0
1
1
8
BYTE N
(Valid)
BYTE COUNT
SCLK
NO ACK
8
ACK
ACK
8
0
BYTE1
1
ACK
ACK
MSB
8
1
(Valid)
BYTE 0
Fig.6b (READ)
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