Datasheet

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
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