參數(shù)資料
型號(hào): MPC755CRX400LE
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 30/56頁(yè)
文件大?。?/td> 0K
描述: IC MPU 32BIT 400MHZ PPC 360-CBGA
標(biāo)準(zhǔn)包裝: 44
系列: MPC7xx
處理器類型: 32-位 MPC7xx PowerPC
速度: 400MHz
電壓: 2V
安裝類型: 表面貼裝
封裝/外殼: 360-BBGA,F(xiàn)CCBGA
供應(yīng)商設(shè)備封裝: 360-FCCBGA(25x25)
包裝: 托盤
MPC755 RISC Microprocessor Hardware Specifications, Rev. 8
36
Freescale Semiconductor
System Design Information
8
System Design Information
This section provides electrical and thermal design recommendations for successful application of the
MPC755.
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 400-MHz column in Table 8.
Table 16. MPC755 Microprocessor PLL Configuration Example for 400 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
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)
1011
5x
2x
—250
(500)
333
(666)
375
(750)
400
(800)
1001
5.5x
2x
—275
(550)
366
(733)
1101
6x
2x
200
(400)
300
(600)
400
(800)
0101
6.5x
2x
216
(433)
325
(650)
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)
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