LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
Figure 27. MII - 100BASE-TX Transmit Timing
0ns
250ns
t1
TXCLK
TX_EN
t2
TXD<3:0>
t5
TPOP
t4
t3
CRS
Table 32. MII - 100BASE-TX Transmit Timing Parameters
1
Parameter
Sym
Min
Typ
Max
Units
TXD<3:0>, TX_EN, TX_ER setup
to TX_CLK High
t1
10
–
–
ns
TXD<3:0>, TX_EN, TX_ER hold
from TX_CLK High
t2
0
-1
–
ns
TX_EN sampled to CRS asserted
t3
t4
t5
–
–
6
2
3
9
4
BT
BT
BT
TX_EN sampled to CRS de-asserted
TX_EN sampled to TPOP out (Tx latency)
16
14
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
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Datasheet