參數(shù)資料
型號： MPC8545CPXAQGA
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, PBGA783
封裝： 29 X 29 MM, 1 MM PITCH, FLIP CHIP, PLASTIC, BGA-783
文件頁數(shù)： 107/142頁
文件大?。?/td> 1504K
代理商： MPC8545CPXAQGA
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
Freescale Semiconductor
67
High-Speed Serial Interfaces (HSSI)
Figure 46 shows the SerDes reference clock connection reference circuits for a single-ended clock driver.
It assumes the DC levels of the clock driver are compatible with the MPC8548E SerDes reference clock
input’s DC requirement.
Figure 46. Single-Ended Connection (Reference Only)
15.2.4
AC Requirements for SerDes Reference Clocks
The clock driver selected should provide a high quality reference clock with low phase noise and
cycle-to-cycle jitter. Phase noise less than 100 kHz can be tracked by the PLL and data recovery loops and
is less of a problem. Phase noise above 15 MHz is filtered by the PLL. The most problematic phase noise
occurs in the 1–15-MHz range. The source impedance of the clock driver should be 50
Ω to match the
transmission line and reduce reflections which are a source of noise to the system.
The detailed AC requirements of the SerDes reference clocks is defined by each interface protocol based
on application usage. Refer to the following sections for detailed information:
15.2.4.1
Spread Spectrum Clock
SD_REF_CLK/SD_REF_CLK are designed to work with a spread spectrum clock (+0% to –0.5%
spreading at 30–33 kHz rate is allowed), assuming both ends have same reference clock. For better results,
a source without significant unintended modulation should be used.
SD_REF_CLK
100
Ω Differential PWB Trace
Clock Driver
CLK_Out
Single-Ended CLK
Driver Chip
MPC8548E
33
Ω
Total 50
Ω. Assume clock driver’s
output impedance is about 16
Ω.
50
Ω
SerDes Refer.
CLK Receiver
50
Ω
50
Ω
相關(guān)PDF資料
PDF描述
MPC8547CVUAUGB 32-BIT, 1000 MHz, MICROPROCESSOR, CBGA783
MPC8547ECHXAQJA 32-BIT, 1000 MHz, MICROPROCESSOR, CBGA783
MPC8547ECVUAQGB 32-BIT, 1000 MHz, MICROPROCESSOR, CBGA783
MPC8547EHXAQJB 32-BIT, 1000 MHz, MICROPROCESSOR, CBGA783
MPC8547VUAUG 32-BIT, 1000 MHz, MICROPROCESSOR, CBGA783
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