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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) 52 Page - Intel Corporation |
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LXT970ATC датащи(HTML) 52 Page - Intel Corporation |
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52 / 74 page  LXT970A — Dual-Speed Fast Ethernet Transceiver 52 Datasheet Figure 23. MII - 100BASE-TX Transmit Timing / 4B Mode Table 32. MII - 100BASE-TX Transmit Timing Parameters / 4B Mode Parameter Sym Min Typ 1 Max Units2 TXD<3:0>, TX_EN, TX_ER Setup to TX_CLK High t2A 10 –– ns TXD<3:0>, TX_EN, TX_ER Hold from TX_CLK High t2B 5 –– ns TX_EN sampled to CRS asserted t2C – 34 BT TX_EN sampled to CRS de-asserted t2D – 416 BT TX_EN sampled to TPO out (Tx latency) t2E 6 10 14 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. t2A t2B t2E t2C t2D 0ns 250ns TXCLK TX_EN TXD<3:0> CRS TPOP |
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