參數(shù)資料
型號: MPC8555VTALD
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 667 MHz, RISC PROCESSOR, PBGA783
封裝: 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, LEAD FREE, FLIP CHIP, PLASTIC, BGA-783
文件頁數(shù): 62/88頁
文件大?。?/td> 772K
代理商: MPC8555VTALD
MPC8555E PowerQUICC III Integrated Communications Processor Hardware Specification, Rev. 3.1
Freescale Semiconductor
65
Clocking
15 Clocking
This section describes the PLL configuration of the MPC8555E. Note that the platform clock is identical
to the CCB clock.
15.1
Clock Ranges
Table 44 provides the clocking specifications for the processor core and Table 45 provides the clocking
specifications for the memory bus.
Table 44. Processor Core Clocking Specifications
Characteristic
Maximum Processor Core Frequency
Unit Notes
533 MHz
600 MHz
667 MHz
833 MHz
1000 MHz
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
e500 core
processor
frequency
400
533
400
600
400
667
400
833
400
1000
MHz 1, 2, 3
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 15.2, “Platform/System PLL Ratio,” and Section 15.3, “e500 Core PLL Ratio,” for ratio settings.
2.)The minimum e500 core frequency is based on the minimum platform frequency of 200 MHz.
3. 1000 MHz frequency supports only a 1.3 V core.
Table 45. Memory Bus Clocking Specifications
Characteristic
Maximum Processor Core
Frequency
Unit
Notes
533, 600, 667, 883, 1000 MHz
Min
Max
Memory bus frequency
100
166
MHz
1, 2, 3
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 15.2, “Platform/System PLL
Ratio,” and Section 15.3, “e500 Core PLL Ratio,” for ratio settings.
2. The memory bus speed is half of the DDR data rate, hence, half of the platform clock frequency.
3. 1000 MHz frequency supports only a 1.3 V core.
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