參數(shù)資料
型號: MC7447AHX600NB
廠商: Freescale Semiconductor
文件頁數(shù): 28/56頁
文件大?。?/td> 0K
描述: IC MPU RISC 600MHZ 360-FCCBGA
標(biāo)準(zhǔn)包裝: 44
系列: MPC74xx
處理器類型: 32-位 MPC74xx PowerPC
速度: 600MHz
電壓: 1.1V
安裝類型: 表面貼裝
封裝/外殼: 360-BCBGA,F(xiàn)CCBGA
供應(yīng)商設(shè)備封裝: 360-FCCBGA(25x25)
包裝: 托盤
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
34
Freescale Semiconductor
System Design Information
9
System Design Information
This section provides system and thermal design recommendations for successful application of the
MPC7447A.
9.1
Clocks
9.1.1
PLL Configuration
The MPC7447A PLL is configured by the PLL_CFG[0:4] signals. For a given SYSCLK (bus) frequency,
the PLL configuration signals set the internal CPU and VCO frequency of operation. The PLL
configuration for the MPC7447A is shown in Table 13 for a set of example 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 1400 MHz column in Table 8. When enabled, dynamic frequency switching
(DFS) also affects the core frequency by halving the bus-to-core multiplier; see Section 9.8.5, “Dynamic
Frequency Switching (DFS),” for more information. Note that when DFS is enabled the resulting core
frequency must meet the minimum core frequency requirements described in Table 8.
Table 13. MPC7447A Microprocessor PLL Configuration Example for 1420-MHz Parts
PLL_
CFG[0:4]
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Bus-to-
Core
Multiplier
Core-to-
VCO
Multiplier
Bus (SYSCLK) Frequency
33
MHz
50
MHz
67
MHz
75
MHz
83
MHz
100
MHz
133
MHz
167
MHz
01000
2x 1
2x
10000
3x 1
2x
10100
4x 1
2x
668
(1333)
10110
5x
2x
665
(1333)
835
(1670)
10010
5.5x
2x
732
(1466)
919
(1837)
11010
6x
2x
600
(1200)
798
(1600)
1002
(2004)
01010
6.5x
2x
650
(1300)
865
(1730)
1086
(2171)
00100
7x
2x
700
(1400)
931
(1862)
1169
(2338)
00010
7.5x
2x
623
(1245)
750
(1500)
998
(2000)
1253
(2505)
11000
8x
2x
600
(1200)
664
(1328)
800
(1600)
1064
(2128)
1336
(2672)
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