• 參數(shù)資料
    型號: MPC8548CVTATJB
    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, PBGA783
    封裝: 29 X 29 MM, 1 MM PITCH, FLIP CHIP, LEAD FREE, PLASTIC, BGA-783
    文件頁數(shù): 127/142頁
    文件大?。?/td> 1504K
    代理商: MPC8548CVTATJB
    MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
    Freescale Semiconductor
    85
    Serial RapidIO
    is specified as the test pattern for use in eye pattern and jitter measurements. Annex 48B of IEEE Std.
    802.3ae-2002 is recommended as a reference for additional information on jitter test methods.
    17.9.1
    Eye Template Measurements
    For the purpose of eye template measurements, the effects of a single-pole high pass filter with a 3 dB point
    at (baud frequency)/1667 is applied to the jitter. The data pattern for template measurements is the
    continuous jitter test pattern (CJPAT) defined in Annex 48A of IEEE 802.3ae. All lanes of the LP-serial
    link shall be active in both the transmit and receive directions, and opposite ends of the links shall use
    asynchronous clocks. Four lane implementations shall use CJPAT as defined in Annex 48A. Single lane
    implementations shall use the CJPAT sequence specified in Annex 48A for transmission on lane 0. The
    amount of data represented in the eye shall be adequate to ensure that the bit error ratio is less than 10–12.
    The eye pattern shall be measured with AC coupling and the compliance template centered at 0 V
    differential. The left and right edges of the template shall be aligned with the mean zero crossing points of
    the measured data eye. The load for this test shall be 100-
    Ω resistive ± 5% differential to 2.5 GHz.
    17.9.2
    Jitter Test Measurements
    For the purpose of jitter measurement, the effects of a single-pole high pass filter with a 3 dB point at (baud
    frequency)/1667 is applied to the jitter. The data pattern for jitter measurements is the Continuous Jitter test
    pattern (CJPAT) pattern defined in Annex 48A of IEEE 802.3ae. All lanes of the LP-serial link shall be
    active in both the transmit and receive directions, and opposite ends of the links shall use asynchronous
    clocks. Four lane implementations shall use CJPAT as defined in Annex 48A. Single lane implementations
    shall use the CJPAT sequence specified in Annex 48A for transmission on lane 0. Jitter shall be measured
    with AC coupling and at 0 V differential. Jitter measurement for the transmitter (or for calibration of a jitter
    tolerance setup) shall be performed with a test procedure resulting in a BER curve such as that described
    in Annex 48B of IEEE 802.3ae.
    17.9.3
    Transmit Jitter
    Transmit jitter is measured at the driver output when terminated into a load of 100
    Ω resistive ± 5%
    differential to 2.5 GHz.
    17.9.4
    Jitter Tolerance
    Jitter tolerance is measured at the receiver using a jitter tolerance test signal. This signal is obtained by first
    producing the sum of deterministic and random jitter defined in Section 17.7, “Receiver Specifications,
    and then adjusting the signal amplitude until the data eye contacts the 6 points of the minimum eye opening
    of the receive template shown in Figure 54 and Table 65. Note that for this to occur, the test signal must
    have vertical waveform symmetry about the average value and have horizontal symmetry (including jitter)
    about the mean zero crossing. Eye template measurement requirements are as defined above. Random
    jitter is calibrated using a high pass filter with a low frequency corner at 20 MHz and a 20 dB/decade
    roll-off below this. The required sinusoidal jitter specified in Section 17.7, “Receiver Specifications,is
    then added to the signal and the test load is replaced by the receiver being tested.
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