參數(shù)資料
型號: MC7448VU1700LC
廠商: Freescale Semiconductor
文件頁數(shù): 29/60頁
文件大小: 0K
描述: IC MPU RISC 32BIT 360-FCCBGA
標準包裝: 44
系列: MPC74xx
處理器類型: 32-位 MPC74xx PowerPC
速度: 1.7GHz
電壓: 1.3V
安裝類型: 表面貼裝
封裝/外殼: 360-CBGA,F(xiàn)CCBGA
供應商設備封裝: 360-FCCBGA(25x25)
包裝: 托盤
MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4
Freescale Semiconductor
35
System Design Information
9
System Design Information
This section provides system and thermal design requirements and recommendations for successful
application of the MPC7448.
9.1
Clocks
The following sections provide more detailed information regarding the clocking of the MPC7448.
9.1.1
PLL Configuration
The MPC7448 PLL is configured by the PLL_CFG[0:5] 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 MPC7448 is shown in Table 12. 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 Table 8.
When enabled, dynamic frequency switching (DFS) also affects the core frequency by halving or
quartering the bus-to-core multiplier; see Section 9.7.5, “Dynamic Frequency Switching (DFS),” for more
information. Note that when DFS is enabled the resulting core frequency must meet the adjusted minimum
core frequency requirements (fcore_DFS) described in Table 8. Note that the PLL_CFG[5] is currently used
for factory test only and should be tied low, and that the MPC7448 PLL configuration settings are
compatible with the MPC7447A PLL configuration settings when PLL_CFG[5] = 0.
Table 12. MPC7448 Microprocessor PLL Configuration Example
PLL_CFG[0:5]
Example Core and VCO Frequency in MHz
Bus-to-Core
Multiplier 5
Core-to-VCO
Multiplier 5
Bus (SYSCLK) Frequency
33.3
MHz
50
MHz
66.6
MHz
75
MHz
83
MHz
100
MHz
133
MHz
167
MHz
200
MHz
010000
2x 6
1x
100000
3x 6
1x
600
101000
4x 6
1x
667
800
101100
5x
1x
667
835
1000
100100
5.5x
1x
733
919
1100
110100
6x
1x
600
800
1002
1200
010100
6.5x
1x
650
866
1086
1300
001000
7x
1x
700
931
1169
1400
000100
7.5x
1x
623
750
1000
1253
1500
110000
8x
1x
600
664
800
1064
1336
1600
011000
8.5x
1x
638
706
850
1131
1417
1700
011110
9x
1x
600
675
747
900
1197
1500
011100
9.5x
1x
633
712
789
950
1264
1583
101010
10x
1x
667
750
830
1000
1333
1667
100010
10.5x
1x
700
938
872
1050
1397
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