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参数资料
| 型号： | IMIC9806CY |
| 厂商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封装： | SSOP-48 |
| 文件页数： | 13/15页 |
| 文件大小： | 185K |
| 代理商： | IMIC9806CY |
C9806C
I
2C Frequency Clock Generator for Mobile Pentium II Applications.
Preliminary
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.0
2/9/2000
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 7 of 15
http://www.imicorp.com
Dial-a-Frequency
Feature (Cont.)
R
Min N
Max N
42
44
87
43
45
90
44
46
92
45
47
94
46
48
96
47
49
98
48
50
100
49
51
102
50
52
104
51
53
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, bits7,6,5,4). P value may be determined from the following
table:
S(3:0)
P
0000
32005333
0001, 1011
48008000
0010, 0011, 0101,1001, 1010
64010666
0110, 0111, 1000, 11xx
96016000
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
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.
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| IMIC9827JT | 制造商:Rochester Electronics LLC 功能描述:TIMING DEVICE - Tape and Reel |
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