FLLXT971A Intel, FLLXT971A Datasheet - Page 64

• Manufacturer Part Number: FLLXT971A
• Description: 3.3V Dual Speed Fast Ethernet PHY Transceicer
• Manufacturer: Intel

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LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
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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
0ns
-8
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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