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DP83256 Datasheet(PDF) 124 Page - National Semiconductor (TI) |
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DP83256 Datasheet(HTML) 124 Page - National Semiconductor (TI) |
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124 / 144 page  70 Electrical Characteristics (Continued) AC Characteristics for the PMD Interface Outputs (ANSI Specifications) 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 Comments in square brackets are section references to the ANSI documents where these specifications can be found Symbol Parameter Conditions Min Typ Max Units T57 PMRD Total Transmit Jitter (Note 1) 072 ns p-p Duty Cycle Distortion (DCD)a PMD 81 Data Dependent Jitter (DDJ)a Random Jitter (RJ) T58 Total Recovered Clock (RXC OUT) Jitter (Note 1) 25 ns p-p Static Alignment Error Accuracy (SAE)a PMD E2 Clock Data Dependent Jitter (C DDJ)a Random Jitter (C RJ) Note 1 This parameter is not tested but is assured through characterization data and periodic testing of sample units 124 |
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