lxt971a Intel Corporation, lxt971a Datasheet - Page 64

• Manufacturer Part Number: lxt971a
• Description: 3.3v Dual-speed Fast Ethernet Phy Transceiver
• Manufacturer: Intel Corporation

LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
64
Figure 31. 100BASE-FX Transmit Timing
Table 32. 100BASE-FX Transmit Timing Parameters
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
TX_EN sampled to CRS de-asserted
TX_EN sampled to TPFO out (Tx
latency)
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production
2. BT is the duration of one bit as transferred to and from the MAC and is the reciprocal of the bit rate.
testing.
100BASE-T bit time = 10
TXD<3:0>
TXCLK
TX_EN
Parameter
TPFO
CRS
-8
0ns
s or 10 ns.
t5
t3
t2
Symbol
t1
t1
t2
t3
t4
t5
Min
12
17
22
0
5
Typ
–
–
–
–
–
1
t4
250ns
Max
5.3
20
24
–
–
Units
BT
BT
BT
ns
ns
Rev. Date: August 7, 2002
2
Document #: 249414
Test Conditions
Revision #: 002
Datasheet
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