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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8308VMADDA датащи(PDF) 42 Page - Freescale Semiconductor, Inc |
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MPC8308VMADDA датащи(HTML) 42 Page - Freescale Semiconductor, Inc |
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42 / 88 page  MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1 42 Freescale Semiconductor PCI Express and silicon. The RX eye diagram must be aligned in time using the jitter median to locate the center of the eye diagram. The eye diagram must be valid for any 250 consecutive UIs. 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 The reference impedance for return loss measurements is 50 Ω to ground for both the D+ and D– line (that is, as measured by a Vector Network Analyzer with 50 Ω probes—see Figure 29). Note that the series capacitors, CPEACCTX, are optional for the return loss measurement. Figure 28. Minimum Receiver Eye Timing and Voltage Compliance Specification 11.5.1 Compliance Test and Measurement Load The AC timing and voltage parameters must be verified at the measurement point, as specified within 0.2 inches of the package pins, into a test/measurement load shown in Figure 29. NOTE The allowance of the measurement point to be within 0.2 inches of the package pins is meant to acknowledge that package/board routing may benefit from D+ and D– not being exactly matched in length at the package pin boundary. VRX-DIFFp-p-MIN > 175 mV 0.4 UI = TRX-EYE-MIN VRX-DIFF = 0 mV (D+ D– Crossing Point) VRX-DIFF = 0 mV (D+ D– Crossing Point) |
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