• 參數(shù)資料
    型號: MPC8378CVRAGGA
    廠商: FREESCALE SEMICONDUCTOR INC
    元件分類: 微控制器/微處理器
    英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA689
    封裝: 31 X 31 MM, 2.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-689
    文件頁數(shù): 32/125頁
    文件大?。?/td> 894K
    代理商: MPC8378CVRAGGA
    MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 5
    Freescale Semiconductor
    14
    4.3
    eTSEC Gigabit Reference Clock Timing
    The following table provides the eTSEC gigabit reference clocks (EC_GTX_CLK125) AC timing specifications.
    Table 9. EC_GTX_CLK125 AC Timing Specifications
    At recommended operating conditions with LVDD = 2.5 ± 0.125 mV/ 3.3 V ± 165 mV
    Parameter/Condition
    Symbol
    Min
    Typical
    Max
    Unit
    Note
    EC_GTX_CLK125 frequency
    tG125
    —125
    MHz
    EC_GTX_CLK125 cycle time
    tG125
    —8
    ns
    EC_GTX_CLK rise and fall time
    LVDD = 2.5 V
    LVDD = 3.3 V
    tG125R/tG125F
    ——
    0.75
    1.0
    ns
    EC_GTX_CLK125 duty cycle
    1000Base-T for RGMII, RTBI
    tG125H/tG125
    47
    53
    %
    EC_GTX_CLK125 jitter
    ±150
    ps
    Notes:
    1. Rise and fall times for EC_GTX_CLK125 are measured from 0.5 and 2.0 V for LVDD = 2.5 V and from 0.6 and 2.7 V for
    LVDD =3.3 V.
    2. EC_GTX_CLK125 is used to generate the GTX clock for the eTSEC transmitter with 2% degradation. The
    EC_GTX_CLK125 duty cycle can be loosened from 47%/53% as long as the PHY device can tolerate the duty cycle
    generated by the eTSEC GTX_CLK. See Section 8.3.4, “RGMII and RTBI AC Timing Specifications,for the duty cycle for
    10Base-T and 100Base-T reference clock.
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