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XRT75R12 Datasheet(PDF) 6 Page - Exar Corporation |
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XRT75R12 Datasheet(HTML) 6 Page - Exar Corporation |
6 / 90 page XRT75R12 3 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR REV. 1.0.3 PIN DESCRIPTIONS (BY FUNCTION) SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS PIN # SIGNAL NAME TYPE DESCRIPTION P4 TxON I Transmit On/Off Input Upon power up, the transmitters are powered on. Turning the transmitters On or Off is selected through the microprocessor interface by programming the appropriate channel register if this pin is pulled "High". If the TxON pin is pulled "Low", all 12 transmitters are powered off. NOTE: TxON is ideal for redundancy applications. See the R3 Technology section of this datasheet for more details. Internally pulled "High". F22 AA22 H22 Y23 G26 AA25 G1 AA2 H5 Y4 F5 AA5 TxCLK0 TxCLK1 TxCLK2 TxCLK3 TxCLK4 TxCLK5 TxCLK6 TxCLK7 TxCLK8 TxCLK9 TxCLK10 TxCLK11 I Transmit Clock Input These input pins have three functions: • They function as the timing source for the Transmit Section of the corresponding channel within the XRT75R12. • They are used by the Transmit Section of the LIU IC to sample the corresponding TxPOS_n and TxNEG_n input pins. • They are used to clock the PRBS generator NOTE: The user is expected to supply a 44.736MHz ± 20ppm clock signal (for DS3 applications), 34.368MHz ± 20 ppm clock signal (for E3 applications) or a 51.84MHz ± 4.6ppm clock signal (for STS-1, Stratum 3E or better applications). E23 AB24 J22 AA23 G25 AA26 G2 AA1 J5 AA4 E4 AB3 TxPOS0 TxPOS1 TxPOS2 TxPOS3 TxPOS4 TxPOS5 TxPOS6 TxPOS7 TxPOS8 TxPOS9 TxPOS10 TxPOS11 I Transmit Positive Data Input The function of these digitial input pins depends upon whether the corre- sponding channel has been configured to operate in the Single-Rail or Dual-Rail Mode. Single Rail Mode - Transmit Data Input Operating in the Single-Rail Mode; all transmit input data will be serially applied to this input pin. This signal will be latched into the Transmit Sec- tion circuitry on the active edge of the TxCLK_n signal. 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 In the Dual-Rail Mode, the user should apply a pulse to this input pin when a positive-polarity pulse is to be transmitted onto the line. This signal will be latched into the Transmit Section circuitry upon the active edge of the TxCLK_n signal,. 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, B3ZS/HDB3 encoding must have already been done prior to this input. |
Similar Part No. - XRT75R12_07 |
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Similar Description - XRT75R12_07 |
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