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XRT59L91ID Datasheet(PDF) 9 Page - Exar Corporation |
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XRT59L91ID Datasheet(HTML) 9 Page - Exar Corporation |
9 / 28 page XRT59L91 9 Rev. P2.00 Preliminary TClk TxP O S TxNE G tS U tHO Figure 2. Illustration on how the XRT59L91 Device Samples the data on the TXPOS and TXNEG input pins In general, if the XRT59L91 device samples a “1” on the TxPOS input pin, then the “Transmit Section” of the device will ultimately generate a positive polarity pulse via the TTIP and TRing output pins (across a 1:2 transformer). Conversely, if the XRT59L91 device samples a “1” on the “TxNEG” input pin, then the “Transmit Section” of the device will ultimately generate a negative polarity pulse via the TTIP and TRing output pins (across a 1:2 transformer). 1.2.1 Operating the Transmitter in the “Clockless” Mode The user can configure the XRT59L91 device to oper- ate in the “Clockless” mode by doing the following: l Not applying a clock signal to the TXClk input, and either pulling this pin to VDD or letting it float. l By applying RZ (Return to Zero) data to the TxPOS and TxNEG input pins, as illustrated below. TxPO S TxN E G TxC lk D a ta 1 1 0 1 1 0 1 Bit Pe rio d RZ P u lse wid th should conform to G .703 T e m p la te N o pulse is to be applie d in the se cond half of th e bit perio d N o A ctivity in TxC lk L in e Figure 3. IIlustration on how the Terminal Equipment should apply data to the “Transmit Sec- tion” of the XRT59L91 Device, when operating in the “Clockless” Mode |
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