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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83848JSQ датащи(PDF) 74 Page - Texas Instruments |
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DP83848JSQ датащи(HTML) 74 Page - Texas Instruments |
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74 / 80 page  73 www.national.com 8.2.21 100BASE-TX Signal Detect Timing Note: The signal amplitude on PMD Input Pair must be TP-PMD compliant. 8.2.22 100 Mb/s Internal Loopback Timing Note: Due to the nature of the descrambler function, all 100BASE-TX Loopback modes will cause an initial “dead-time” of up to 550 µs during which time no data will be present at the receive MII outputs. The 100BASE-TX timing specified is based on device delays after the initial 550 µs “dead-time”. Note: Measurement is made from the first rising edge of TX_CLK after assertion of TX_EN. Parameter Description Notes Min Typ Max Units T2.21.1 SD Internal Turn-on Time 1 ms T2.21.2 SD Internal Turn-off Time 350 µs Parameter Description Notes Min Typ Max Units T2.22.1 TX_EN to RX_DV Loopback 100 Mb/s internal loopback mode 240 ns T2.21.1 SD+ internal T2.21.2 PMD Input Pair TX_CLK TX_EN TXD[3:0] CRS RX_CLK RXD[3:0] RX_DV T2.22.1 |
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