參數(shù)資料
型號: PC7457MGU933N
廠商: Atmel Corp.
英文描述: PowerPC 7457 RISC Microprocessor
中文描述: 7457的PowerPC RISC微處理器
文件頁數(shù): 53/66頁
文件大?。?/td> 522K
代理商: PC7457MGU933N
53
PC7457/47 [Preliminary]
5345B–HIREL–02/04
4. In PLL-off mode, no clocking occurs inside the PC7455 regardless of the SYSCLK input.
The PC7457 generates the clock for the external L3 synchronous data SRAMs by divid-
ing the core clock frequency of the PC7457. The core-to-L3 frequency divisor for the L3
PLL is selected through the L3_CLK bits of the L3CR register. Generally, the divisor
must be chosen according to the frequency supported by the external RAMs, the fre-
quency of the PC7457 core, and timing analysis of the circuit board routing.
Table 19 shows various example L3 clock frequencies that can be obtained for a given
set of core frequencies.
Notes:
1. The core and L3 frequencies are for reference only. Note that maximum L3 frequency is design dependent. Some examples
may represent core or L3 frequencies which are not useful, not supported, or not tested for the PC7457; see “L3 Clock AC
Specifications” on page 24 for valid L3_CLK frequencies and for more information regarding the maximum L3 frequency.
2. These core frequencies are not supported by all speed grades; see Table 8 on page 20.
Table 19.
Sample Core-to-L3 Frequencies
(1)
Core
Frequency
(MHz)
÷2
÷2.5
÷3
÷3.5
÷4
÷4.5
÷5
÷5.5
÷6
÷6.5
÷7
÷7.5
÷8
500
250
200
167
143
125
111
100
91
83
77
71
67
63
533
266
213
178
152
133
118
107
97
89
82
76
71
67
550
275
220
183
157
138
122
110
100
92
85
79
73
69
600
300
240
200
171
150
133
120
109
100
92
86
80
75
650
325
260
217
186
163
144
130
118
108
100
93
87
81
666
333
266
222
190
167
148
133
121
111
102
95
89
83
700
350
280
233
200
175
156
140
127
117
108
100
93
88
733
367
293
244
209
183
163
147
133
122
113
105
98
92
800
400
320
266
230
200
178
160
145
133
123
114
107
100
866
433
347
289
248
217
192
173
157
145
133
124
115
108
933
467
373
311
266
233
207
187
170
156
144
133
124
117
1000
500
400
333
285
250
222
200
182
166
154
143
133
125
1050
(2)
525
420
350
300
263
233
191
191
175
162
150
140
131
1100
(2)
550
440
367
314
275
244
200
200
183
169
157
147
138
1150
(2)
575
460
383
329
288
256
209
209
192
177
164
153
144
1200
(2)
600
480
400
343
300
267
218
218
200
185
171
160
150
1250
(2)
638
500
417
357
313
278
227
227
208
192
179
167
156
1300
(2)
650
520
433
371
325
289
236
236
217
200
186
173
163
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