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Altera_Forum's avatar
Altera_Forum
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17 years ago

Quartus II and Cyclone II problems

I have two problems, one on each of two boards, though both boards use the same FPGA (EP2C8) and the same PROM (EPCS4). I'm using a parallel port ByteBlaster II to program. Problem 1: On board...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

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It may be the case, that the JTAG loaded configuration has been removed by a reconfiguration attempt in-between, e. g. by some hardware activating NCONFIG.

Sometimes, tt may be necessary to check halt on-chip configuration controller in Tools - Options - Programmer.

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It looks like that was the problem - the NCONFIG pin, though pulled high, is connected to a voltage monitor. I suppose it was tripping after the SFL was loaded but before the PROM was loaded.

Thanks for your help.