參數(shù)資料
型號: MPC8544ECVTARJB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 1067 MHz, RISC PROCESSOR, PBGA783
封裝: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-783
文件頁數(shù): 116/120頁
文件大?。?/td> 1321K
代理商: MPC8544ECVTARJB
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
95
Clocking
19 Clocking
This section describes the PLL configuration of the MPC8544E . Note that the platform clock is identical
to the core complex bus (CCB) clock.
19.1
Clock Ranges
Table 63 provides the clocking specifications for the processor cores and Table 64 provides the clocking
specifications for the memory bus.
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 65:
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 63. Processor Core Clocking Specifications
Characteristic
Maximum Processor Core Frequency
Unit
Notes
667 MHz
800 MHz
1000 MHz
1067 MHz
Min
Max
Min
Max
Min
Max
Min
Max
e500 core processor frequency
667
800
667
1000
667
1067
MHz
1, 2
Notes:
1. Caution: The CCB to SYSCLK ratio and e500 core to CCB ratio settings must be chosen such that the resulting SYSCLK
frequency, e500 (core) frequency, and CCB 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 minimum e500 core frequency is based on the minimum platform frequency of 333 MHz.
Table 64. 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.
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