Datasheet

Symbol
T2.26.1
T2.26.3T2.26.2
T2.26.4
X1
TXD[1:0]
TX_EN
PMD Output
Pair
Valid data
TX_CLK
TX_EN
TXD[3:0]
CRS
RX_CLK
RX-DV
RXD[3:0]
T2.25.1
DP83849IF
www.ti.com SNOSAX8D –JUNE 2009–REVISED APRIL 2013
4.29 AC Specifications — 10 Mb/s Internal Loopback Timing
(1)
Parameter Description Notes Min Typ Max Units
T2.25.1 TX_EN to RX_DV Loopback 10 Mb/s internal loopback mode 2 µs
(1) Measurement is made from the first rising edge of TX_CLK after assertion of TX_EN.
4.30 AC Specifications — RMII Transmit Timing
Parameter Description Notes Min Typ Max Units
T2.26.1 X1 Clock Period 50 MHz Reference Clock 20 ns
T2.26.2 TXD[1:0], TX_EN, Data Setup to X1 rising 4 ns
T2.26.3 TXD[1:0], TX_EN, Data Hold from X1 rising 2 ns
T2.26.4 X1 Clock to PMD Output Pair Latency (100Mb) 100BASE-TX or 100BASE-FX 11 bits
Copyright © 2009–2013, Texas Instruments Incorporated Electrical Specifications 27
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