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Altera_Forum's avatar
Altera_Forum
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16 years ago

Lost JTAG communication

Hello All,

I am using a Stratix II with an EPC16 configuration device. I've managed to create a situation where I cannot achieve JTAG communication after programming with a .POF file. My error was that I forgot to set the unused pins to the tristate condition and ended up grounding them instead. Is there a way to disable the load on power-up so that I can get the JTAG communication back or erase the configuration device so that I can load the corrected .POF file?

Thanks.

2 Replies

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

    You could drive the nConfig pin low (short it to ground). I believe you can just do this momentarily.

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

    Thanks Jake,

    I tried your suggestion, but it didn't work in this case. It got me thinking though that I could lift the Data0 pin and maybe the Stratix ll wouldn't program - this worked! Thanks for the reply.

    Gary