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Altera_Forum
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8 years ago

cyclon does not load

HI, I have an architecture with: - cyclon iv ep4ce6e22c8n with a programming chip epc64n it is a new release of an old schematic working fine, just the PCB was changed. I am able to load wit...
Altera_Forum's avatar
Altera_Forum
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8 years ago

Why are you using 1K pullups to VCC (+3.3V?) on CONF_DONE, nCONFIG, and nSTATUS signals? Altera recommendation is 10K.

1K pulldown on nCE should be OK.

"it is a new release of an old schematic working fine, just the PCB was changed." ... it could also then be poor layout practices on the associated signals (DCLK, etc).