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Vic3Dexe's avatar
Vic3Dexe
Icon for Occasional Contributor rankOccasional Contributor
4 years ago
Solved

Cyclone III multi-device AS problem

I have two identical EP3C16Q240C8N in multi-device AS scheme. First, I've soldered master and EPCS16 and checked it is accessible through JTAG and AS. It was fine, so I've soldered slave device, ...
  • Vic3Dexe's avatar
    Vic3Dexe
    4 years ago

    Problem solved.

    I'm very embarassed.

    You (of course) need to assign nCEO at master as programming pin.

    I'm really don't know how did it turn out as regular i/o.

    Sorry to bother you.

Vic3Dexe's avatar
Vic3Dexe
Icon for Occasional Contributor rankOccasional Contributor
4 years ago

The problem: they both don't load from EPCS.

All user i/o pins at both devices at Vccio - 0.2V (Vccio = 3.4, all pins has about 3.22).

Master nCEO = slave nCE = 3.4V (pullup 10k to 3.3 rail).

CONF_DONE = 0.

nCONFIG = 3.4V.

nSTATUS = 3.4V.

Just rechecked slave connections - all ground/power/program pins soldered correctly.

And again - signle master worked correctly.