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Altera_Forum
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11 years ago

Cyclone IV fails to configure below -20C

I have a Cyclone IV design that operates correctly down to -20C but fails to configure below that temp. I have attached the schematic for the configuration block along with a scope trace showing co...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Does nCONFIG get held low by the FPGA during POR?

I have two banks (Banks 2 and 5) powered at 2.5V for a LVDS interfaces and the rest powered at 3.3V for CMOS interfaces, could this be playing havoc with the POR?

Checking the 1.2V core and 2.5V rails now to see if there is a problem with them. We have been able to run several of the boards in house down below -40C and get 100% start-up, the customer's sees problems below -20C. We are using the customer's host in our in house tests and so far have not been able to duplicate the problem. I've run out of straws to grasp at, any more suggestions?