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XRT75L02IV Datasheet(PDF) 7 Page - Exar Corporation |
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XRT75L02IV Datasheet(HTML) 7 Page - Exar Corporation |
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7 / 50 page  XRT75L02 xr xr xr xr TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER REV. 1.0.3 5 30 TxClkINV/ SClk I Hardware Mode: Transmit Clock Invert Host Mode: Serial Clock Input: Function of this pin depends on whether the XRT75L02 is configured to operate in Hardware mode or Host mode. In Hardware mode, setting this input pin “High” configures all the Transmitters to sample the TPOS_n and TNEG_n data on the rising edge of the TxClk_n . NOTES: 1. If the XRT75L02 is configured in HOST mode, this pin functions as SClk input pin (please refer to the pin description for Microprocessor interface). 82 TxMON I Transmitter Monitor: When this pin is pulled “High”, MTIP and MRING are connected internally to TTIP and TRING and allows self monitoring of the transmitter. 74 52 TxLEV_0 TxLEV_1 I Transmit Line Build-Out Enable/Disable Select - Channel 0: Transmit Line Build-Out Enable/Disable Select - Channel 1: These input pins select the Transmit Line Build-Out circuit. Setting these pins to "High" disables the Line Build-Out circuit of Channel n. In this mode, Channel n outputs partially-shaped pulses onto the line via the TTIP_n and TRing_n output pins. Setting these pins to "Low" enables the Line Build-Out circuit of Channel n. In this mode, Channel n outputs shaped pulses onto the line via the TTIP_n and TRing_n output pins. To comply with the Isolated DSX-3/STSX-1 Pulse Template Requirements per Bellcore GR-499-CORE or Bellcore GR-253-CORE: 1. Set these pins to "1" if the cable length between the Cross-Connect and the transmit output of Channel is greater than 225 feet. 2. Set these pins to "0" if the cable length between the Cross-Connect and the transmit output of Channel is less than 225 feet. These pins are active only if the following two conditions are true: a. The XRT75L02 is configured to operate in either the DS3 or SONET STS-1 Modes. b. The XRT75L02 is configured to operate in the Hardware Mode. NOTES: 1. These pins are internally pulled down. 2. If the XRT75L02 is configured in HOST mode, these pins should be tied to GND. 75 51 TAOS_0 TAOS_1 I Transmit All Ones Select - Channel 0: Transmit All Ones Select - Channel 1: A “High" on this pin causes the Transmitter Section of Channel_n to generate and transmit a continuous AMI all “1’s” pattern onto the line. The frequency of this “1’s” pattern is determined by TxClk_n. NOTES: 1. This input pin is ignored if the XRT75L02 is operating in the HOST Mode and should be tied to GND. 2. Analog Loopback and Remote Loopback have priority over request. 3. This pin is internally pulled down. TRANSMIT INTERFACE PIN # SIGNAL NAME TYPE DESCRIPTION |
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