DP83865_04 Datasheet, PDF (77/86 Pages) National Semiconductor (TI) – 10/100/1000 Ethernet Physical Layer

6.0 Electrical Specifications (Continued)
6.6 100 Mb/s Timing
6.6.1 100 Mb/s MII Transmit Timing
T21
TX_CLK
TXD[3:0], TX_EN,
TX_ER
T19
MDI
T20
T22
Begin of Frame
Parameter
Description
T19
TXD[3:0], TX_EN and TX_ER Setup to ↑ TX_CLK
T20
TXD[3:0], TX_EN and TX_ER Hold from ↑ TX_CLK
T21
TX_CLK Duty Cycle
T22
MII to MDI latency
Notes
Min Typ Max Units
10
ns
-1
ns
40
60 %
136
ns
6.6.2 100 Mb/s MII Receive Timing
RX_CLK
RXD[3:0]
RX_DV
RX_ER
MDI
T23
T24
T25
Begin of Frame
Valid Data
Parameter
Description
T23
RX_CLK Duty Cycle
T24
↑ RX_CLK to RXD[3:0], RX_DV, RX_ER Delay
T25
MDI to MII latency
Notes
Min Typ Max Units
35
65 %
10
30 ns
288
ns
77
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