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    參數(shù)資料
    型號: MPC8547ECVUAQJA
    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, CBGA783
    封裝: 29 X 29 MM, 1 MM PITCH, FLIP CHIP, LEAD FREE, CERAMIC, BGA-783
    文件頁數(shù): 103/142頁
    文件大小: 1504K
    代理商: MPC8547ECVUAQJA
    MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
    Freescale Semiconductor
    63
    High-Speed Serial Interfaces (HSSI)
    The input amplitude requirement:
    — This requirement is described in detail in the following sections.
    Figure 39. Receiver of SerDes Reference Clocks
    15.2.2
    DC Level Requirement for SerDes Reference Clocks
    The DC level requirement for the MPC8548E SerDes reference clock inputs is different depending on the
    signaling mode used to connect the clock driver chip and SerDes reference clock inputs as described
    below:
    Differential mode
    — The input amplitude of the differential clock must be between 400 and 1600 mV differential
    peak-peak (or between 200 and 800 mV differential peak). In other words, each signal wire of
    the differential pair must have a single-ended swing less than 800 mV and greater than 200 mV.
    This requirement is the same for both external DC-coupled or AC-coupled connection.
    — For external DC-coupled connection, as described in Section 15.2.1, “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 40 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 41 shows the SerDes reference clock
    input requirement for AC-coupled connection scheme.
    Single-ended mode
    — The reference clock can also be single-ended. The SD_REF_CLK input amplitude
    (single-ended swing) must be between 400 and 800 mV peak-to-peak (from Vmin to Vmax) with
    SD_REF_CLK either left unconnected or tied to ground.
    — The SD_REF_CLK input average voltage must be between 200 and 400 mV. Figure 42 shows
    the SerDes reference clock input requirement for single-ended signaling mode.
    Input
    Amp
    50
    Ω
    50
    Ω
    SD_REF_CLK
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