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DP83849IFVS/NOPB Datasheet(PDF) 26 Page - Texas Instruments |
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DP83849IFVS/NOPB Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 108 page ![]() TX_CLK TX_EN TXD[3:0] CRS RX_CLK RX-DV RXD[3:0] T2.24.1 DP83849IF SNOSAX8D – JUNE 2009 – REVISED APRIL 2013 www.ti.com 4.28 AC Specifications — 100 Mb/s Internal Loopback Timing (1) (2) Parameter Description Notes Min Typ Max Units T2.24.1 TX_EN to RX_DV Loopback 100 Mb/s internal loopback mode 240 ns (1) Measurement is made from the first rising edge of TX_CLK after assertion of TX_EN. (2) Due to the nature of the descrambler function, all 100BASE-TX Loopback modes will cause an initial “dead-time” of up to 550 µs during which time no data will be present at the receive MII outputs. The 100BASE-TX timing specified is based on device delays after the initial 550µs “dead-time”. 26 Electrical Specifications Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: DP83849IF |
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