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XRT75L00IV Datasheet(PDF) 9 Page - Exar Corporation |
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XRT75L00IV Datasheet(HTML) 9 Page - Exar Corporation |
9 / 50 page XRT75L00 REV. 1.0.2 E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR 7 37 RNEG/LCV O Receive Negative Data Output/Line Code Violation Indicator Function of these pins depends on whether the XRT75L00 is configured in Single Rail or Dual Rail mode. If the XRT75L00 is configured in Dual Rail mode, a negative pulse is output through RNEG. In Hardware mode: Tie the pin SR/DR (pin 22) “High” to configure the XRT75L00 in Single Rail mode and tie “Low” to configure in Dual Rail mode. In HOST mode: XRT75L00 can be configured in Single Rail or Dual Rail by set- ting or clearing the bit in the block control register. Line Code Violation Indicator If the XRT75L00 is configured in Single Rail mode then: Whenever the Receiver Section detects a Line Code violation, it pulses this output pin “High”. This output pin remains “Low” at all other times. It is advisable to sample this output pin using the RxClk output signal. 11 RRING I Receive Ring Input This input pin along with RTIP is used to receive the bipolar line signal from the Remote DS3/E3/STS-1 Terminal. 12 RTIP I Receive TIP Input This input pin along with RRNG is used to receive the bipolar line signal from the Remote DS3/E3/STS-1 Terminal. 27 RxMON/ SDO I Receive Monitoring Mode or Serial Data Output: In Hardware mode, when this pin is tied “High” XRT75L00 configures into mon- itoring channel. In the monitoring mode, the Receiver is capable of monitoring the signals with 20 dB flat loss plus 6 dB cable attenuation. This allows to moni- tor very weak signal before declaring LOS. In HOST Mode, XRT75L00 can be configured to be a monitoring channel by setting the bits in the receive control register. NOTE: If the XRT75L00 is configured in HOST mode, this pin functions as SDO pin (please refer to the pin description for the Microprocessor Interface). RECEIVE INTERFACE PIN #SIGNAL NAME TYPE DESCRIPTION |
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