參數(shù)資料
型號: XPC755BRX400LE
英文描述: Microprocessor
中文描述: 微處理器
文件頁數(shù): 33/52頁
文件大小: 1274K
代理商: XPC755BRX400LE
MOTOROLA
MPC755 RISC Microprocessor Hardware Specifications
33
System Design Information
1.8
System Design Information
This section provides electrical and thermal design recommendations for successful application of the
MPC755.
1.8.1
PLL Configuration
The MPC755 PLL is configured by the PLL_CFG[0:3] signals. For a given SYSCLK (bus) frequency, the
PLL configuration signals set the internal CPU and VCO frequency of operation. These must be chosen such
that they comply with Table 8. Table 16 shows the valid configurations of these signals and an example
illustrating the core and VCO frequencies resulting from various PLL configurations and example bus
frequencies. In this example, shaded cells represent settings that, for a given SYSCLK frequency, result in
core and/or VCO frequencies that do not comply with the 450-MHz column in Table 8.
Table 16. MPC755 Microprocessor PLL Configuration Example for 450 MHz Parts
PLL_CFG
[0:3]
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Bus-to-
Core
Multiplier
Core-to
VCO
Multiplier
Bus
33 MHz
Bus
50 MHz
Bus
66 MHz
Bus
75 MHz
Bus
80 MHz
Bus
100 MHz
0100
2x
2x
200
(400)
1000
3x
2x
200
(400)
225
(450)
240
(480)
300
(600)
1110
3.5x
2x
233
(466)
263
(525)
280
(560)
350
(700)
1010
4x
2x
200
(400)
266
(533)
300
(600)
320
(640)
400
(800)
0111
4.5x
2x
225
(450)
300
(600)
338
(675)
360
(720)
450
(900)
1011
5x
2x
250
(500)
333
(666)
375
(750)
400
(800)
1001
5.5x
2x
275
(550)
366
(733)
412
(824)
440
(880)
1101
6x
2x
200
(400)
300
(600)
400
(800)
450
(900)
0101
6.5x
2x
216
(433)
325
(650)
433
(866)
0010
7x
2x
233
(466)
350
(700)
0001
7.5x
2x
250
(500)
375
(750)
1100
8x
2x
266
(533)
400
(800)
0110
10x
2x
333
(666)
0011
PLL off/bypass
PLL off, SYSCLK clocks core circuitry directly, 1x bus-to-core implied
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