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XRT5997IV Datasheet(PDF) 10 Page - Exar Corporation |
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XRT5997IV Datasheet(HTML) 10 Page - Exar Corporation |
10 / 37 page XRT5997 10 Rev. 1.0.0 Pin# Symbol Type Description 48 LOS4 O Receiver 4 Loss of Signal: This output pin toggles “high” if Channel 4, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. 49 TxPOS4 O Transmitter - Positive Data Input – Channel 4: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 4) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP4 and TRing4 output pins). The XRT5997 device will sample this input pin upon the falling edge of the TClk4 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP4 and TRing4 output pins. 50 TxNEG4 I Transmitter - Negative Data Input – Channel 4: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of the Channel 4) in the “Clocked” or “Clockless” Mode. In the Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via the TTIP4 and TRing4 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk4 signal. In the Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line (via the TTIP4 and TRing4 output pins). 51 TxClk4 I Transmitter Clock Input – Channel 4: If the user operates Channel 4 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 4 will use the falling edge of this signal to sample the data at the TxPOS4 and TxNEG4 input pins. Note: If the user operates the Channel 4 in the “clockless” mode, then the Terminal Equipment should not apply a clock signal to this input pin. 52 RRing4 I Receiver 4 Negative Bipolar Input: The Receive Section of Channel 4 uses this input pin, along with RTIP4 to receive the bipolar line signal from the “Remote E1 Terminal”. PIN DESCRIPTION (CONT'D) |
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