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    參數(shù)資料
    型號: MPC8572ECPXAULD
    廠商: Freescale Semiconductor
    文件頁數(shù): 115/138頁
    文件大?。?/td> 0K
    描述: MPU POWERQUICC III 1023-PBGA
    標(biāo)準(zhǔn)包裝: 1
    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(yīng)商設(shè)備封裝: 1023-FCPBGA(33x33)
    包裝: 托盤
    MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
    78
    Freescale Semiconductor
    High-Speed Serial Interfaces (HSSI)
    Figure 49 shows the SerDes reference clock connection reference circuits for LVDS type clock driver.
    Because LVDS clock driver’s common mode voltage is higher than the MPC8572E SerDes reference
    clock input’s allowed range (100 to 400mV), AC-coupled connection scheme must be used. It assumes the
    LVDS output driver features 50-
    Ω termination resistor. It also assumes that the LVDS transmitter
    establishes its own common mode level without relying on the receiver or other external component.
    Figure 49. AC-Coupled Differential Connection with LVDS Clock Driver (Reference Only)
    Figure 50 shows the SerDes reference clock connection reference circuits for LVPECL type clock driver.
    Because LVPECL driver’s DC levels (both common mode voltages and output swing) are incompatible
    with MPC8572E SerDes reference clock input’s DC requirement, AC-coupling must be used. Figure 50
    assumes that the LVPECL clock driver’s output impedance is 50
    Ω. R1 is used to DC-bias the LVPECL
    outputs prior to AC-coupling. Its value could be ranged from 140
    Ω to 240Ω depending on clock driver
    vendor’s requirement. R2 is used together with the SerDes reference clock receiver’s 50-
    Ω termination
    resistor to attenuate the LVPECL output’s differential peak level such that it meets the MPC8572E SerDes
    reference clock’s differential input amplitude requirement (between 200mV and 800mV differential peak).
    For example, if the LVPECL output’s differential peak is 900mV and the desired SerDes reference clock
    input amplitude is selected as 600mV, the attenuation factor is 0.67, which requires R2 = 25
    Ω. Consult
    50
    Ω
    50
    Ω
    SD
    n_REF_CLK
    SD
    n_REF_CLK
    Clock Driver
    100
    Ω differential PWB trace
    SerDes Refer.
    CLK Receiver
    Clock Driver
    CLK_Out
    LVDS CLK Driver Chip
    10 nF
    MPC8572E
    相關(guān)PDF資料
    PDF描述
    MPC8572ECPXAULB MPU POWERQUICC III 1023-PBGA
    396-020-521-202 CARD EDGE 20POS DL .125X.250 BLK
    MPC8572ECPXARLB MPU POWERQUICC III 1023-PBGA
    395-012-541-204 CARD EDGE 12POS DL .100X.200 BLK
    395-012-541-202 CARD EDGE 12POS DL .100X.200 BLK
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