LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
Figure 29. MII - 100BASE-FX Transmit Timing
0ns
250ns
t1
TXCLK
TX_EN
t2
TXD<3:0>
t5
FIBOP
t4
t3
CRS
Table 34. MII - 100BASE-FX Transmit Timing Parameters
1
Parameter
Sym
Min
Typ
Max
Units
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
10
0
–
-1
2
–
–
ns
ns
–
4
BT
BT
BT
TX_EN sampled to CRS de-asserted
–
3
16
14
TX_EN sampled to FIBOP out (Tx latency)
6
11
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
56
Datasheet