參數(shù)資料
型號: MPC8548EVUAQJ
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 1000 MHz, MICROPROCESSOR, CBGA783
封裝: 29 X 29 MM, 1 MM PITCH, FLIP CHIP, LEAD FREE, CERAMIC, BGA-783
文件頁數(shù): 30/142頁
文件大?。?/td> 1504K
代理商: MPC8548EVUAQJ
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
Freescale Semiconductor
125
Clocking
19.3
e500 Core PLL Ratio
Table 78 describes the clock ratio between the e500 core complex bus (CCB) and the e500 core clock. This
ratio is determined by the binary value of LBCTL, LALE, and LGPL2 at power up, as shown in Table 78.
19.4
Frequency Options
19.4.1
Sysclk to Platform Frequency Options
Table 79 shows the expected frequency values for the platform frequency when using a CCB clock to
SYSCLK ratio in comparison to the memory bus clock speed.
Table 78. e500 Core to CCB Clock Ratio
Binary Value of
LBCTL, LALE, LGPL2
Signals
e500 core:CCB Clock Ratio
Binary Value of
LBCTL, LALE, LGPL2
Signals
e500 core:CCB Clock Ratio
000
4:1
100
2:1
001
9:2
101
5:2
010
Reserved
110
3:1
011
3:2
111
7:2
Table 79. Frequency Options of SYSCLK with Respect to Memory Bus Speeds
CCB to
SYSCLK Ratio
SYSCLK (MHz)
16.66
25
33.33
41.66
66.66
83
100
111
133.33
Platform/CCB Frequency (MHz)
2
3
333
400
4
333
400
445
533
5
333
415
500
6
400
500
8
333
533
9
375
10
333
417
12
400
500
16
400
533
20
333
500
Note: Due to errata Gen 13 the max sys clk frequency should not exceed 100 MHz if the core clk frequency is below
1200 MHz.
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