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XRT75R03DIV Datasheet(PDF) 9 Page - Exar Corporation |
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XRT75R03DIV Datasheet(HTML) 9 Page - Exar Corporation |
9 / 135 page XRT75R03D 5 REV. 1.0.4 THREE CHANNEL E3/DS3/STS-1 LINE 34 3 25 TPDATA_0/TxDATA_0 TPDATA_1/TxDATA_1 TPDATA_2/TxDATA_2 I Transmit Positive Data Input - Channel 0: Transmit Positive Data Input - Channel 1: Transmit Positive Data Input - Channel 2: Transmit Positive Data/Data Input - Channel n: The function of these input pins depends upon whether the corresponding channel has been configured to operate in the Single-Rail or Dual-Rail Mode. Single Rail Mode - Transmit Data Input - Channel n: If the Channel has been configured to operate in the Single-Rail Mode, then all transmit output data will be serially applied to this input pin. This signal will latched into the Transmit Section circuitry upon either the rising or falling edge of the TxCLK_n signal, depending upon user configuration. In the Single-Rail Mode, the Transmit Section of the LIU IC will then encode this data into either the B3ZS line code (for DS3 and STS-1 applications) or the HDB3 line code (for E3 applications). Dual Rail Mode - Transmit Positive Data Input - Channel n: If the Channel has been configured to operate in the Dual-Rail Mode, then the user should apply a pulse to this input pin, anytime the Transmit Sec- tion of the LIU IC is suppose to generate and transmit a positive-polarity pulse onto the line. This signal will be latched into the Transmit Section cir- cuitry upon either the rising or falling edge of the TxCLK_n signal, depend- ing upon user configuration. In the Dual-Rail Mode, the Transmit Section of the LIU IC will NOT encode this data into either the B3ZS or HDB3 line codes. If the user configures the LIU IC to operate in the Dual-Rail Mode, then B3ZS/HDB3 encoding must have already been done prior to providing the transmit output data to this input pin. 33 2 24 TNData_0 TNData_1 TNData_2 I Transmit Negative Data Input - Channel 0: Transmit Negative Data Input - Channel 1: Transmit Negative Data Input - Channel 2: If a Channel has been configured to operate in the Dual-Rail Mode, then the user should apply a pulse to this input pin anytime the Transmit Section of the LIU IC is suppose to generate and transmit a negative-polarity pulse onto the line. This signal will be latched into the Transmit Section circuitry upon either the rising or falling edge of the TxCLK_n signal, depending upon user configuration. NOTE: If the Channel has been configured operate in the Single-Rail Mode, then this input pin has no function, and should be tied to GND. SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS PIN # SIGNAL NAME TYPE DESCRIPTION |
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