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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8548E датащи(PDF) 73 Page - Freescale Semiconductor, Inc |
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MPC8548E датащи(HTML) 73 Page - Freescale Semiconductor, Inc |
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73 / 143 page  MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 8 Freescale Semiconductor 73 PCI Express A recovered TX UI is calculated over 3500 consecutive unit intervals of sample data. The eye diagram is created using all edges of the 250 consecutive UI in the center of the 3500 UI used for calculating the TX UI. NOTE It is recommended that the recovered TX UI is calculated using all edges in the 3500 consecutive UI interval with a fit algorithm using a minimization merit function (for example, least squares and median deviation fits). Figure 48. Minimum Transmitter Timing and Voltage Output Compliance Specifications 17.4.3 Differential Receiver (RX) Input Specifications Table 57 defines the specifications for the differential input at all receivers (RXs). The parameters are specified at the component pins. Table 57. Differential Receiver (RX) Input Specifications Symbol Parameter Min Nom Max Unit 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. 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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