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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LXT971ABC датащи(PDF) 62 Page - Intel Corporation |
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LXT971ABC датащи(HTML) 62 Page - Intel Corporation |
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62 / 90 page  LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver 62 Datasheet Document #: 249414 Revision #: 002 Rev. Date: August 7, 2002 Figure 29. 100BASE-TX Transmit Timing - 4B Mode Table 30. 100BASE-TX Transmit Timing Parameters - 4B Mode Parameter Symbol Min Typ1 Max Units2 Test Conditions TXD<3:0>, TX_EN, TX_ER setup to TX_CLK High t1 12 – – ns – TXD<3:0>, TX_EN, TX_ER hold from TX_CLK High t2 0 – – ns – TX_EN sampled to CRS asserted t3 20 – 24 BT – TX_EN sampled to CRS de-asserted t4 24 – 28 BT – TX_EN sampled to TPFO out (Tx latency) t5 5.3 – 5.7 BT – 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. 100BASE-T bit time = 10-8 s or 10 ns. t1 t2 t5 t3 t4 0ns 250ns TXCLK TX_EN TXD<3:0> TPFO CRS |
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