LXT9763 — Fast Ethernet 10/100 Hex Transceiver with Full MII
Figure 25. 100BASE-FX Transmit Timing
0ns
250ns
t1
TXCLK
TX_EN
t2
TXD<3:0>
TPFO
t5
t3
t4
CRS
Table 27. 100BASE-FX Transmit Timing Parameters
1
Parameter
Sym
Min
Typ
Max
Units
Test Conditions
TXD<3:0>, TX_EN, TX_ER setup to TX_CLK High
TXD<3:0>, TX_EN, TX_ER hold from TX_CLK High
TX_EN sampled to CRS asserted
t1
t2
t3
t4
t5
15
0
–
–
–
–
–
–
–
ns
ns
–
–
–
–
–
–
3
BT
BT
BT
TX_EN sampled to CRS de-asserted
–
4
TX_EN sampled to TPFO out (Tx latency)
–
13
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
52
Datasheet