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SJadh1's avatar
SJadh1
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7 years ago

What is rx_pma_iqtxrx_clkout signal ?

Hello, I am working on a design with transceiver. I would like to know what is rx_pma_iqtxrx_clkout signal ? What are the usage scenario's of rx_pma_iqtxrx_clkout signal ? Thanks & Regards, Sach...
Deshi_Intel's avatar
Deshi_Intel
Icon for Regular Contributor rankRegular Contributor
7 years ago
Hi Sachin Jadhav, May I know how do you monitor rx_is_lockedtodata signal ? Is it via probe on board or signal_tap ? Can you share with me the screen shot of rx_is_lockedtodata signal ? I do expect rx_is_lockedtodata signal to toggle high and low if there is no incoming data at all. 31.38MHz shouldn't be a valid result if rx_is_lockedtodata is toggling. Thanks. Regards, dlim
  • SJadh1's avatar
    SJadh1
    Icon for New Contributor rankNew Contributor
    7 years ago

    Hello Dlim,

    I have routed rx_is_lockedtodata signal to sma connector(J7) on board. Which is connected to oscilloscope.

    I see toggling behavior of rx_is_lockedtodata if CDR is set to AUTO(rx_set_lockedtoref, rx_set_lockedtodata -> 2'b00).

    But if I set CDR to MANUAL mode (rx_set_lockedtoref, rx_set_lockedtodata -> 2'b01/2'b11) I see rx_is_lockedtodata is high and stable.

    In this case I also see rx_pma_clkout giving 31.38Mhz.

    Thanks & Regards,

    Sachin Jadhav