Datasheet

Symbol
T2.24.1
T2.24.3T2.24.2
T2.24.4
X1
TXD[1:0]
TX_EN
PMD Output
Pair
Valid data
TX_CLK
TX_EN
TXD[3:0]
CRS/CRS_DV
RX_CLK
RX_DV
RXD[3:0]
T2.23.1
DP83620
www.ti.com SNLS339C –JANUARY 2011–REVISED APRIL 2013
4.27 AC Specifications — 10 Mb/s Internal Loopback Timing
Parameter Description Notes Min Typ Max Units
T2.23.1 TX_EN to RX_DV Loopback
(1)
10 Mb/s internal loopback mode 2 µs
(1) Measurement is made from the first falling edge of TX_CLK after assertion of TX_EN.
4.28 AC Specifications — RMII Transmit Timing (Slave Mode)
Parameter Description Notes Min Typ Max Units
T2.24.1 X1 Clock Period 50 MHz Reference Clock 20 ns
T2.24.2 TXD[1:0], TX_EN, Data Setup to X1 rising edge 4 ns
T2.24.3 TXD[1:0], TX_EN, Data Hold from X1 rising edge 2 ns
T2.24.4 X1 Clock to PMD Output Pair Latency (100 Mb)
(1)
100BASE-TX or 100BASE-FX 11 bits
(1) Latency measurement is made from the X1 rising edge to the first bit of symbol.
Copyright © 2011–2013, Texas Instruments Incorporated Electrical Specifications 25
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