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Altera_Forum's avatar
Altera_Forum
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15 years ago

Altgx 8/10

Hello all.

I'm testing ALTGX in basic mode. I have a random pulses at output rx_errdetect and rx_disperr. And no valid data. The signals pll_locked, rx_pll_locked, and rx_freqlocked is high.

I can't find problem. I'm do not use rx_analogreset, rx_digitalreset and rx_digitalreset. Can it be problem? I'm expect that 8/10 encoder/decoder mast be self-synchronized and no reset needed.

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    If I disconnect tx from rx, rx_freqlocked goes down and rx_errdetect rx_disperr go stable up. What wrong with 8/10 decoder?

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    --- Quote Start ---

    Are you sure you're getting valid 8b/10b data into the receiver?

    --- Quote End ---

    Yes. with loop-back option.

    I'm solve this problem. rx and tx interfaces must be reseting before operation. without reset it's won't work.