LXT9763 — Fast Ethernet 10/100 Hex Transceiver with Full MII
Figure 27. 10BASE-T Transmit Timing
TX_CLK
t
1
t2
TXD,
TX_EN,
TX_ER
t
3
t4
CRS
t
5
TPFO
Table 29. 10BASE-T Transmit Timing Parameters
1
Parameter
Sym
Min
Typ
Max
Units
Test Conditions
TXD, TX_EN, TX_ER setup to TX_CLK High
TXD, TX_EN, TX_ER hold from TX_CLK High
TX_EN sampled to CRS asserted
t1
t2
t3
t4
t5
10
0
–
–
2
1
–
–
–
–
–
ns
ns
–
–
–
–
–
–
BT
BT
ns
TX_EN sampled to CRS de-asserted
–
TX_EN sampled to TPFO out (Tx latency)
–
280
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
Figure 28. 10BASE-T SQE (Heartbeat) Timing
TX_CLK
TX_EN
t
1
t
2
COL
54
Datasheet