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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LXT970ATC датащи(PDF) 58 Page - Intel Corporation |
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LXT970ATC датащи(HTML) 58 Page - Intel Corporation |
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58 / 74 page  LXT970A — Dual-Speed Fast Ethernet Transceiver 58 Datasheet Figure 29. MII - 10BASE-T Transmit Timing Table 38. MII - 10BASE-T Transmit Timing Parameters Parameter Sym Min Typ 1 Max Units2 TXD, TX_EN, TX_ER Setup to TX_CLK High t8A 10 –– ns TXD, TX_EN, TX_ER Hold from TX_CLK High t8B 5 –– ns TX_EN sampled to CRS asserted t8C – 04 BT TX_EN sampled to CRS de-asserted t8D – 8 – BT TX_EN sampled to TPO out (Tx latency) t8E – 3 - 5 – 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. 10BASE-T bit time = 10- 7 s or 100 ns. TX_CLK TXD, TX_EN, TX_ER CRS TPO t8A t8C t8E t8D t8B |
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