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    參數(shù)資料
    型號: MPC8544ECVTAQG
    廠商: Freescale Semiconductor
    文件頁數(shù): 82/117頁
    文件大?。?/td> 0K
    描述: MPU POWERQUICC III 783-PBGA
    標準包裝: 36
    系列: MPC85xx
    處理器類型: 32-位 MPC85xx PowerQUICC III
    速度: 1.0GHz
    電壓: 0.95 V ~ 1.05 V
    安裝類型: 表面貼裝
    封裝/外殼: 783-BBGA,F(xiàn)CBGA
    供應商設備封裝: 783-FCPBGA(29x29)
    包裝: 托盤
    MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 6
    Freescale Semiconductor
    67
    High-Speed Serial Interfaces (HSSI)
    — For external DC-coupled connection, as described in Section 16.2.1, “SerDes Reference
    Clock Receiver Characteristics,” the maximum average current requirements sets the
    requirement for average voltage (common mode voltage) to be between 100 and 400 mV.
    Figure 46 shows the SerDes reference clock input requirement for DC-coupled connection
    scheme.
    — For external AC-coupled connection, there is no common mode voltage requirement for the
    clock driver. Since the external AC-coupling capacitor blocks the DC level, the clock driver and
    the SerDes reference clock receiver operate in different command mode voltages. The SerDes
    reference clock receiver in this connection scheme has its common mode voltage set to
    SGND_SRDSn. Each signal wire of the differential inputs is allowed to swing below and above
    the command mode voltage (SGND_SRDSn). Figure 47 shows the SerDes reference clock
    input requirement for AC-coupled connection scheme.
    Single-ended Mode
    — The reference clock can also be single-ended. The SDn_REF_CLK input amplitude
    (single-ended swing) must be between 400 and 800 mV peak-peak (from Vmin to Vmax) with
    SDn_REF_CLK either left unconnected or tied to ground.
    —The SDn_REF_CLK input average voltage must be between 200 and 400 mV. Figure 48 shows
    the SerDes reference clock input requirement for single-ended signaling mode.
    — To meet the input amplitude requirement, the reference clock inputs might need to be DC or
    AC-coupled externally. For the best noise performance, the reference of the clock could be DC
    or AC-coupled into the unused phase (SDn_REF_CLK) through the same source impedance as
    the clock input (SDn_REF_CLK) in use.
    Figure 46. Differential Reference Clock Input DC Requirements (External DC-Coupled)
    Figure 47. Differential Reference Clock Input DC Requirements (External AC-Coupled)
    SDn_REF_CLK
    Vmax < 800 mV
    Vmin > 0 V
    100 mV < Vcm < 400 mV
    200 mV < Input Amplitude or Differential Peak < 800 mV
    SDn_REF_CLK
    Vcm
    200 mV < Input Amplitude or Differential Peak < 800 mV
    Vmax < Vcm + 400 mV
    Vmin > Vcm - 400 mV
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