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TLK1501 - RX_CLK when signal is lost

TLK1501 - RX_CLK when signal is lost

This question is answered
Petr Burian
Posted by
on May 17 2012 06:22 AM
Prodigy70 points

Hello.

Is rx clock produced even when receiving signal is lost ? 

If signal is lost, RXD[15..0], RX_DV and RX_ER should be high; but I don't know whether RX_CLK is produced or not.

Thank you...

Petr 

TLK1501 rx_clk
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  • Atul Patel
    Posted by
    on May 17 2012 10:37 AM
    Verified Answer
    Verified by
    Expert7440 points

    Petr,

    In the case where the serial input to the device (TLK2501/TLK1501..) is lost, the RX_CLK will likely track the device's GTX_CLK or the CDR as it tries to lock.  You can check this by removing the GTX_CLK and observing the behavior of the RX_CLK.

    Thanks,

     

    Atul Patel

    Texas Instruments

    GTX_CLK tlk2501 RX_CLK TLK1501
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  • Petr Burian
    Posted by
    on May 17 2012 11:50 AM
    Prodigy70 points

    Mr. Patel,

    I will try to ask by another way. Can I clock receive data bus terminals (signals RXD, RX_DV and RX_ER) by RX_CLK when input serial signal is lost ? I purpose to use it for  the detection of loss of signal.

    Thanks,

    Petr Burian.

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  • Atul Patel
    Posted by
    on May 17 2012 14:01 PM
    Expert7440 points

    Petr,

     When the incoming serial signal is lost, the parallel output data singles (RD) are not valid and RX_CLK is not guaranteed to be at the correct frequency needed for your application so using RX_CLK may not provide expected results consistently.   The RX_DV/LOS pin provides LOS condition indication for the device.

     

    Thanks,

     

    Atul

    TLK1501
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