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DP83256 데이터시트(PDF) 121 Page - Texas Instruments |
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DP83256 데이터시트(HTML) 121 Page - Texas Instruments |
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121 / 146 page ![]() 70 Electrical Characteristics (Continued) AC Characteristics for the PMD Interface The following signals are covered PMD Indicate Data (PMID) Signal Detect (SD) and PMD Request Data (PMRD) Symbol Parameter Conditions Min Typ Max Units T36 PMIDg to PMRDg Latency Looped Back through 5 LBC Configuration Switch Cycles LBC1 e 125 MHz In Lock (Note 1) T37 SD Minimum Pulse Width 120 ns T38 PMRD Rise Time (Note 2) 15 ns T39 PMRD Fall Time (Note 2) 15 ns Note 1 This only applies when the Alternate PMD Interface is disabled APMDREGAPMDEN e 0 Note 2 This parameter is not tested but is assured by correlation with characterization data TLF11708 – 36 FIGURE 7-10 Primary PMD Timing Diagrams 120 |
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