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参数资料
型号： MPC92429EIR2
厂商： INTEGRATED DEVICE TECHNOLOGY INC
元件分类： 时钟产生/分配
英文描述： 400 MHz, OTHER CLOCK GENERATOR, PQCC28
封装： LEAD FREE, PLASTIC, LCC-28
文件页数： 9/12页
文件大小： 292K
代理商： MPC92429EIR2
Product Group
6
Freescale Semiconductor
MPC92429
PROGRAMMING INTERFACE
Programming the MPC92429
Programming the MPC92429 amounts to properly
configuring the internal PLL dividers to produce the desired
synthesized frequency at the output. The output frequency
can be represented by this formula:
FOUT = (fXTAL ÷ 16) x (M) ÷ (N)
(1)
where fXTAL is the crystal frequency, M is the PLL feedback-
divider and N is the PLL post-divider. The input frequency and
the selection of the feedback divider M is limited by the
VCO-frequency range. fXTAL and M must be configured to
match the VCO frequency range of 200 to 400 MHz in order
to achieve stable PLL operation:
MMIN = fVCO,MIN ÷ fXTAL and
(2)
MMAX = fVCO,MAX ÷ fXTAL
(3)
For instance, the use of a 16 MHz input frequency requires
the configuration of the PLL feedback divider between
M = 200 and M = 400. Table 7 shows the usable VCO
frequency and M divider range for other example input
frequencies. Assuming that a 16 MHz input frequency is
used, equation 1 reduces to:
FOUT = M ÷ N(4)
Table 7. MPC92429 Frequency Operating Range
M
M[8:0]
VCO frequency for an crystal interface frequency of
Output frequency for fXTAL = 16 MHz and for N =
10
12
14
16
18
20
1
2
4
8
160
010100000
200
170
010101010
212.5
180
010110100
202.5
225
190
010111110
213.75
237.5
200
011001000
200
225
250
200
100
50
25
210
011010010
210
236.25
262.5
210
105
52.5
26.25
220
011011100
220
247.5
275
220
110
55
27.5
230
011100110
201.25
230
258.75
287.5
230
115
57.5
28.75
240
011110000
210
240
270
300
240
120
60
30
250
011111010
218.75
250
281.25
312.5
250
125
62.5
31.25
260
100000100
227.5
260
292.5
325
260
130
65
32.5
270
100001110
202.5
236.25
270
303.75
337.5
270
135
67.5
33.75
280
100011000
210
245
280
315
350
280
140
70
35
290
100100010
217.5
253.75
290
326.25
362.5
290
145
72.5
36.25
300
100101100
225
262.5
300
337.5
375
300
150
75
37.5
310
100110110
232.5
271.25
310
348.75
387.5
310
155
77.5
38.75
320
101000000
200
240
280
320
360
400
320
160
80
40
330
101001010
206.25
247.5
288.75
330
371.25
330
165
82.5
41.25
340
101010100
212.5
255
297.5
340
382.5
340
170
85
42.5
350
101011110
218.75
262.5
306.25
350
393.75
350
175
87.5
43.75
360
101101000
225
270
315
360
180
90
45
370
101110010
231.25
277.5
323.75
370
185
92.5
46.25
380
101111100
237.5
285
332.5
380
190
95
47.5
390
110000110
243.75
292.5
341.25
390
195
97.5
48.75
400
110010000
250
300
350
400
200
100
50
410
110011010
256.25
307.5
358.75
420
110100100
262.5
315
367.5
430
110101110
268.75
322.5
376.25
440
110111000
275
330
385
450
111000010
281.25
337.5
393.75
510
111111110
318.75
382.5
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