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參數(shù)資料
| 型號(hào)： | C9630CY |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | 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)： | 8/18頁(yè) |
| 文件大小： | 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 8 of 18
APPROVED PRODUCT
C9630
Dial-a-Frequency
Feature
SMBus Dial-a-frequency
feature is available in this device via byte7, and byte 8
These bytes allow the user to enter the N and R values that will allow them to program any CPU frequency
desired following the formula:
Where N and R values are programmed in binary into byte 7 for N and byte 8 for R. See table below for min and max
allowed values.
R
42
43
44
45
46
47
48
49
50
51
Min N
44
45
46
47
48
49
50
51
52
53
Max N
87
90
92
94
96
98
100
102
104
107
P is a large value PLL constant that depends on the last frequency selection achieved through the hardware selectors
(S3, S2, S1, S0) or through the software selectors (byte0 , bits 7,6,5,4,2). P value may be determined from the following
table:
S(4:0)
P
00001, 00010, 00111, 01101, 10001,
10010, 10111, 11010, 11011, 11100,
11101, 11110, 11111
00000, 00011, 00110, 01010, 10000,
10101
00100, 00101, 01000, 01001, 01011,
01100, 01110, 01111, 10011, 10100,
10110, 11000, 11001
96016000
64010667
48008000
Therefore, if a 145MHz (use 145x10
6
)value is desired, then we should apply 145 into equation 1, and start by choosing
R to be 47 (assume the last frequency selection has the value P = 96016000):
145X10
6
= 96016000 X N => N = 70.97775371
47
R
N
P
Fcpu
×
=
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