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MPC8544E bảng dữ liệu(PDF) 77 Page - Freescale Semiconductor, Inc |
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MPC8544E bảng dữ liệu(HTML) 77 Page - Freescale Semiconductor, Inc |
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77 / 117 page ![]() MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5 Freescale Semiconductor 77 PCI Express Figure 56. Minimum Transmitter Timing and Voltage Output Compliance Specifications 17.4.3 Differential Receiver (RX) Input Specifications Table 60 defines the specifications for the differential input at all receivers. The parameters are specified at the component pins. Table 60. Differential Receiver (RX) Input Specifications Symbol Parameter Min Nom Max Units Comments UI Unit interval 399.88 400 400.12 ps Each UI is 400 ps ± 300 ppm. UI does not account for spread spectrum clock dictated variations. See Note 1. VRX-DIFFp-p Differential peak-to- peak input voltage 0.175 — 1.200 V VRX-DIFFp-p = 2 × |VRX-D+ – VRX-D–| See Note 2. TRX-EYE Minimum receiver eye width 0.4 — — UI The maximum interconnect media and transmitter jitter that can be tolerated by the receiver can be derived as TRX-MAX-JITTER = 1 – TRX-EYE = 0.6 UI. See Notes 2 and 3. VTX-DIFF = 0 mV (D+ D– Crossing Point) [De-Emphasized Bit] 0.07 UI = UI – 0.3 UI (JTX-TOTAL-MAX) 566 mV (3 dB) >= VTX-DIFFp-p-MIN >= 505 mV (4 dB) [Transition Bit] VTX-DIFFp-p-MIN = 800 mV VRX-DIFF = 0 mV (D+ D– Crossing Point) [Transition Bit] VTX-DIFFp-p-MIN = 800 mV |
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