lxt972a Intel Corporation, lxt972a Datasheet - Page 50
lxt972a
Manufacturer Part Number
lxt972a
Description
3.3v Dual-speed Fast Ethernet Transceiver Datasheet
Manufacturer
Intel Corporation
Datasheet
1.LXT972A.pdf
(70 pages)
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LXT972A — 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
50
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
TX_EN sampled to CRS de-asserted
TX_EN sampled to TPO out (Tx latency)
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
2. BT is the duration of one bit as transferred to and from the MAC and is the reciprocal of the bit rate. 10BASE-T bit time = 10
7
TX_EN,
Figure 27. 10BASE-T Transmit Timing
Table 28. 10BASE-T Transmit Timing Parameters
TX_ER
TX_CLK
s or 100 ns.
TXD,
CRS
TPO
Parameter
t
1
t
3
t
5
Sym
t5
t1
t2
t3
t4
Min
10
0
–
–
–
t
2
Typ
72.5
–
–
2
1
1
Max
–
–
–
–
–
t
4
Units
BT
BT
BT
ns
ns
2
Test Conditions
Datasheet
–
–
–
–
–
-