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Altera_Forum
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12 years ago

Is CONF_DONE read by the FPGA?

Hi All, I'm debugging a board with a Cyclone IV device where the CONF_DONE pin was inadvertently left floating. The FPGA configures fine over JTAG but when configuring from EPCS it reads the w...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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Once upon a time I think there was an option to get the FPGA to ignore CONF_DONE but it doesn't seem to be there anymore in 12.1SP1.

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Its still there.

File->Convert Programming File, Click on the Advanced options. There's a check-button there that says "Disable AS mode CONF_DONE error check".

Though I suspect that applies to AS programming with a JTAG cable, rather than with an EPCS device, since the EPCS device cannot check CONF_DONE ... but then again, perhaps the FPGA does an internal check of CONF_DONE.

Report back on whether it made a difference.

Cheers,

Dave