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Altera_Forum
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15 years ago

CIII/EPCS design configures and programs but does not start

Hi, I have a design with EP3C40 and EPCS64. I create flash files with: sof2flash --epcs --compress --input=logic.sof --output=logic.srec elf2flash --epcs --after=logic.srec --input=softwar...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Okay, I figured out what was going on. My board has a reset circuit that holds everything in reset until the supplies are stable. However, it turns out it doesn't monitor the SDRAM supply. So I think what was happening was the FPGA would configure and start the boot loader which would then copy the software into the not-quite-ready SDRAM. I added a delay to the release of reset and now it comes up reliably.

Mark.