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DP83256 датащи(PDF) 122 Page - Texas Instruments |
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DP83256 датащи(HTML) 122 Page - Texas Instruments |
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122 / 146 page ![]() 70 Electrical Characteristics (Continued) AC Characteristics for the Alternate PMD Interface The following input signals are covered PMD Indicate Data (PMID) Signal Detect (SD) Receive Data In (RXD IN) Receive Clock In (RXC IN) The following output signals are covered PMD Request Data (PMRD) Transmit Clock (TXC) Recovered Data Out (RXD OUT) Recovered Clock Out (RXC OUT) Note The Alternate PMD Interface is only available on the 160 pin DP83257 PLAYERa Device and the 100 pin DP83256-AP Device The Transmit Clock is enabled by the CGMREGTXCE bit The rest of the Alternate PMD Interface is enabled by the APMDREGAPMDEN bit Symbol Parameter Conditions Min Typ Max Units T40 RXC OUTa to RXD OUTg Change Time 10 50 ns T41 PMIDg to RXD OUT Latency In Lock 16 ns T42 RXD INg to RXC INa Setup Time 40 ns T43 RXD INg to RXC INa Hold Time 05 ns T44 TXCa to PMRDg Change Time 40 70 ns T42 SD Minimum Pulse Width 120 ns T45 RXC OUTg Pulse Width High (Note 1) 35 45 ns T46 RXC OUTg Rise Time (Note 1) 15 ns T47 RXC OUTg Fall Time (Note 1) 15 ns T48 RXD OUTg Rise Time (Note 1) 15 ns T49 RXD OUTg Fall Time (Note 1) 15 ns T50 TXCg Pulse Width High (Note 1) 35 45 ns T51 TXCg Rise Time (Note 1) 15 ns T52 TXCg Fall Time (Note 1) 15 ns T38 PMRD Rise Time (Note 1) 15 ns T39 PMRD Fall Time (Note 1) 15 ns Note 1 This parameter is not tested but is assured by correlation with characterization data TLF11708 – 52 FIGURE 7-11 ECL Rise and Fall Times 121 |
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