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Altera_Forum
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16 years ago

EPCS4 data format?

I have an EPCS4 on a board with a Cyclone II. I'm using the pof file to load the EPCS4 and that all works fine. I have a processor on the board which then goes to read the EPCS4 to save it on an SD C...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Just a short update. I managed to leave the status register of the EPCS4 with the Block Protect Bits set to 001 which protects sector 7 and leaves sectors 0-6 unprotected. The Cyclone II part that I am using only requires 4 sectors (1.9 MBits of the 4 MBits available). Even so the ByteBlaster and the programming software obviously rely on a ChipErase Command which failed. Since I did not ask the programmer to "Verify", I was at a loss to explaining why things were not working. Using the processor interface it was clear that programming was not working. I used the Write Status Register command to reset the block protect bits back to zero and all was resolved.

Two lessons here:

  1. Always put things back the way you found them.

  2. Trust (the programmer), but verify the result.
Once burned, twice chastened