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  • 參數(shù)資料
    型號: MPC8548VUATJB
    廠商: FREESCALE SEMICONDUCTOR INC
    元件分類: 微控制器/微處理器
    英文描述: 32-BIT, 1200 MHz, MICROPROCESSOR, CBGA783
    封裝: 29 X 29 MM, 1 MM PITCH, FLIP CHIP, LEAD FREE, CERAMIC, BGA-783
    文件頁數(shù): 101/142頁
    文件大?。?/td> 1504K
    代理商: MPC8548VUATJB
    MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
    Freescale Semiconductor
    61
    High-Speed Serial Interfaces (HSSI)
    The transmitter output signals and the receiver input signals SD_TX, SD_TX, SD_RX and SD_RX
    each have a peak-to-peak swing of A – B volts. This is also referred as each signal wire’s
    single-ended swing.
    2. Differential output voltage, VOD (or differential output swing):
    The differential output voltage (or swing) of the transmitter, VOD, is defined as the difference of
    the two complimentary output voltages: VSD_TX –VSD_TX. The VOD value can be either positive
    or negative.
    3. Differential input voltage, VID (or differential input swing):
    The differential input voltage (or swing) of the receiver, VID, is defined as the difference of the two
    complimentary input voltages: VSD_RX –VSD_RX. The VID value can be either positive or
    negative.
    4. Differential peak voltage, VDIFFp
    The peak value of the differential transmitter output signal or the differential receiver input signal
    is defined as differential peak voltage, VDIFFp = |A – B| volts.
    5. Differential peak-to-peak, VDIFFp-p
    Since the differential output signal of the transmitter and the differential input signal of the receiver
    each range from A – B to –(A – B) volts, the peak-to-peak value of the differential transmitter
    output signal or the differential receiver input signal is defined as differential peak-to-peak voltage,
    VDIFFp-p = 2 × VDIFFp = 2 × |(A – B)| volts, which is twice of differential swing in amplitude, or
    twice of the differential peak. For example, the output differential peak-to-peak voltage can also be
    calculated as VTX-DIFFp-p = 2 × |VOD|.
    6. Common mode voltage, Vcm
    The common mode voltage is equal to one half of the sum of the voltages between each conductor
    of a balanced interchange circuit and ground. In this example, for SerDes output, Vcm_out = VSD_TX
    + VSD_TX = (A + B)/2, which is the arithmetic mean of the two complimentary output voltages
    within a differential pair. In a system, the common mode voltage may often differ from one
    component’s output to the other’s input. Sometimes, it may be even different between the receiver
    input and driver output circuits within the same component. It is also referred to as the DC offset.
    Figure 38. Differential Voltage Definitions for Transmitter or Receiver
    Differential Swing, VID or VOD = A – B
    A Volts
    B Volts
    SD_TX or
    SD_RX
    SD_TX or
    SD_RX
    Differential Peak Voltage, VDIFFp = |A – B|
    Differential Peak-Peak Voltage, VDIFFpp = 2*VDIFFp (not shown)
    Vcm = (A + B)/2
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