参数资料
型号: MPC8544DVTANG
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA783
封装: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, FC-PBGA-783
文件页数: 3/128页
文件大小: 1411K
代理商: MPC8544DVTANG
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1
100
Freescale Semiconductor
Clocking
19.2
CCB/SYSCLK PLL Ratio
The CCB clock is the clock that drives the e500 core complex bus (CCB), and is also called the platform
clock. The frequency of the CCB is set using the following reset signals, as shown in Table 66:
SYSCLK input signal
Binary value on LA[28:31] at power up
Note that there is no default for this PLL ratio; these signals must be pulled to the desired values. Also note
that the DDR data rate is the determining factor in selecting the CCB bus frequency, since the CCB
frequency must equal the DDR data rate.
Table 65. Memory Bus Clocking Specifications
Characteristic
Maximum Processor Core
Frequency
Unit
Notes
667, 800, 1000, 1067 MHz
Min
Max
Memory bus clock speed
166
266
MHz
1, 2
Notes:
1. Caution: The CCB clock to SYSCLK ratio and e500 core to CCB clock ratio settings must be chosen such that the resulting
SYSCLK frequency, e500 (core) frequency, and CCB clock frequency do not exceed their respective maximum or minimum
operating frequencies. Refer to Section 19.2, “CCB/SYSCLK PLL Ratio,and Section 19.3, “e500 Core PLL Ratio,for ratio
settings.
2. The memory bus speed is half of the DDR/DDR2 data rate, hence, half of the platform clock frequency.
Table 66. CCB Clock Ratio
Binary Value of
LA[28:31] Signals
CCB:SYSCLK Ratio
Binary Value of
LA[28:31] Signals
CCB:SYSCLK Ratio
0000
16:1
1000
8:1
0001
Reserved
1001
9:1
0010
Reserved
1010
10:1
0011
3:1
1011
Reserved
0100
4:1
1100
12:1
0101
5:1
1101
Reserved
0110
6:1
1110
Reserved
0111
Reserved
1111
Reserved
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