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XRT73L03BIV Datasheet(PDF) 11 Page - Exar Corporation |
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XRT73L03BIV Datasheet(HTML) 11 Page - Exar Corporation |
11 / 61 page XRT73L03B 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT REV. 1.0.1 9 CONTROL AND ALARM INTERFACE PIN #NAME TYPE DESCRIPTION 31 4 15 MRing_0 MRing_1 MRing_2 I Monitor Ring Input - Channel (n): The bipolar line output signal from TRing_(n) can be connected to this pin via a 270-ohm resistor in order to check for line driver failure. This pin is internally pulled "High". 30 5 16 MTIP_0 MTIP_1 MTIP_2 I Monitor Tip Input - Channel (n): The bipolar line output signal from TTIP_(n) can be connected to this pin via a 270-ohm resistor in order to check for line driver failure. This pin is internally pulled "High". 38 120 21 DMO_0 DMO_1 DMO_2 O Drive Monitor Output - Channel (n): If no transmitted AMI signal is present on MTIP_(n) and MRing_(n) input pins for 128±32 TxClk periods, then DMO_(n) toggles and remains "High" until the next AMI signal is detected. 36 6 7 TAOS_0 TAOS_1 TAOS_2 I Transmit All Ones Select - Channel (n): A "High" on this pin causes the Transmit Section, within 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). This input pin is ignored if the XRT73L03B is operating in the HOST Mode. NOTE: This pin should be tied to GND if the XRT73L03B is going to be operating in the HOST Mode, (internally pulled-down). 55 107 58 RLOS_0 RLOS_1 RLOS_2 O Receive Loss of Signal Output Indicator - Channel (n): This output pin toggles "High" if Channel (n) has detected a Loss of Sig- nal Condition in the incoming line signal. The criteria that the XRT73L03B uses to declare an LOS Condition depends upon whether the device is operating in the E3 or STS-1/DS3 Mode. 57 105 60 RLOL_0 RLOL_1 RLOL_2 O Receive Loss of Lock Output Indicator - Channel (n): This output pin toggles "High" if Channel (n) has detected a Loss of Lock Condition. Channel (n) declares an LOL (Loss of Lock) Condition if the recovered clock frequency deviates from the Reference Clock frequency (available at the EXClk(n) input pin) by more than 0.5%. 56 106 59 LCV_0 LCV_1 LCV_2 O Line Code Violation Indicator - Channel 0: Whenever the Receive Section of Channel (n) detects a Line Code Vio- lation, it pulses this output pin "High". This output pin remains "Low" at all other times. NOTE: The XRT73L03B outputs an NRZ pulse via this output pin. It is advisable to sample this output pin via the RxClk_(n) clock output signal. 66 ICT I In-Circuit Test Input: Setting this pin "Low" causes all digital and analog outputs to go into a high-impedance state to allow for in-circuit testing. This pin should be set to "High" for normal operation. This pin is internally pulled "High". 67 89 75 LOSTHR_0 LOSTHR_1 LOSTHR_2 I Loss of Signal Threshold Control - Channel (n): Forcing the LOSTHR_(n) pin to GND or VDD provides two settings. This pin must be set to a “High” or “Low” level upon power up and should not be changed during operation. This pin is only applicable during DS3 or STS-1 operations. |
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