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Altera_Forum
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15 years ago

changing FPGA cyclone4-115 with another one on the same PCB card

I hope that somebody can make me a favor! I'm working on ALTERA FPGA Cyclone IV family. I'm about finishing the PCB design, but my idea is to have a card with multiple FPGA possibility. to ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

hi

10x for your reply

I made it before, but the problem is concerning the PCB.

even if the migration is well done, I can't change the FPGA with another one because of the routing.

imagine that you replace the Cyclone4-115 with a lower one (75 or 55) on the same card, the problem we have is that some IO pins of the cyclone4-75 are a VCCint for the cyclone4-115; and the VCCint voltage is in the middle rang of the IO voltage what mean we have a metastability :(