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DP83849I bảng dữ liệu(PDF) 39 Page - National Semiconductor (TI)

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tên linh kiện DP83849I
Giải thích chi tiết về linh kiện  DP83849I PHYTER DUAL Industrial Temperature with Flexible Port Switching Dual Port 10/100 Mb/s Ethernet Physical Layer Transceiver
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DP83849I bảng dữ liệu(HTML) 39 Page - National Semiconductor (TI)

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be rejected. Once this first squelch level is overcome cor-
rectly, the opposite squelch level must then be exceeded
within 150 ns. Finally the signal must again exceed the
original squelch level within 150 ns to ensure that the input
waveform will not be rejected. This checking procedure
results in the loss of typically three preamble bits at the
beginning of each packet.
Only after all these conditions have been satisfied will a
control signal be generated to indicate to the remainder of
the circuitry that valid data is present. At this time, the
smart squelch circuitry is reset.
Valid data is considered to be present until the squelch
level has not been generated for a time longer than 150 ns,
indicating the End of Packet. Once good data has been
detected, the squelch levels are reduced to minimize the
effect of noise causing premature End of Packet detection.
end of packet
start of packet
VSQ-(reduced)
VSQ-
VSQ+(reduced)
VSQ+
<150 ns
<150 ns
>150 ns
Figure 11. 10BASE-T Twisted Pair Smart Squelch Operation



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