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Altera_Forum's avatar
Altera_Forum
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15 years ago

CycloneIII 3c120 does not load through USB

Hi

I have just received a CycloneIII 3c120 Dev kit. When I try to load a configuration (*.sof) through USB Blaster, Quartus II gives the following messages:

Info: Started Programmer operation at Tue Aug 23 15:18:56 2011

Error: Can't access JTAG chain

Error: Operation failed

Info: Ended Programmer operation at Tue Aug 23 15:18:57 2011

All switches are according to the documentation. But I can't load any design

Help much appreciated

1 Reply

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

    Hello

    After experimenting and looking at the different documents, I changed the SW3.4 to 0 and then could program the device. In the "User Guide", the information tells SW3.4 on, in the "Reference Manual" it tells, that SW3.4 should be off. (Max-enable off).

    So, it seems, that the problem is solved. But the documentation is not clear.

    Am I wrong?