Datasheet

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STE100P
Figure 15. 100BaseT Transmit Timing
Table 9.
Parameter Sym Min Typ Max Units
TXD, TX_EN, TX_ER Setup to TX_CLK High t2A 10 - - ns
TXD, TX_EN, TX_ER Hold from TX_CLK High t2B 5 - - ns
TX_EN sampled to CRS asserted t2C - 30 40 ns
TX_EN sampled to CRS de-asserted t2D - 40 160 ns
TX_EN sampled to TXP out (Tx latency) t2E 60 100 140 ns
BT is the duration of one bit as transferred to and from the MAC and is the reciprocal of the bit rate.
TXP