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Altera_Forum
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14 years ago

Cyclone III configuration corrupts image

All, We have 30 boards with a single EP3c25 wired for JTAG and AS configuration, as per the handbook. Several pairs of eyes have peered at the schematic and the boards and everything looks like...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Two turns of the board later, we still have a problem.

I enabled CRC and see a CRC error on the bad downloads, so the image is indeed corrupt.

One thing we discoverd by accident is that if we connect 3.3v to the 2.5 rail, the board works like a champ. We've tried this on several boards and not only do the program but, in all ways, seem just fine.

Why should this work? What harm might we be doing to the chip? Anybody?