參數(shù)資料
型號: MPC8568VTAUJJ
廠商: Freescale Semiconductor
文件頁數(shù): 106/139頁
文件大?。?/td> 0K
描述: MPU POWERQUICC III 1023-PBGA
標準包裝: 24
系列: MPC85xx
處理器類型: 32-位 MPC85xx PowerQUICC III
速度: 1.333GHz
電壓: 1.1V
安裝類型: 表面貼裝
封裝/外殼: 1023-BBGA,F(xiàn)CBGA
供應商設備封裝: 1023-FCPBGA(33x33)
包裝: 托盤
MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1
Freescale Semiconductor
69
High-Speed Serial Interfaces (HSSI)
Figure 47 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 MPC8568E SerDes reference clock
input’s DC requirement.
Figure 47. Single-Ended Connection (Reference Only)
13.2.4
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:
13.2.4.1
Spread Spectrum Clock
SD_REF_CLK/SD_REF_CLK were 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.
50
Ω
50
Ω
SD_REF_CLK
100
Ω differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
Single-Ended
CLK Driver Chip
MPC8568E
33
Ω
Total 50
Ω. Assume clock driver’s
output impedance is about 16
Ω.
50
Ω
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