@Dave: I take it sram fpga's are more susceptible that non-volatile programmable devives?
All FPGAs (actually any digital chip like an ASIC/SoC) has registers and memory cells tha tcan be affected by radiation (flip bits from 0 to 1 and vice versa) -- tyh ereason SRAM-based FPGAs are especially vunerable is that their confifuration cells can also be flipped.
There are ways aroudn thsi like using triple-more redundency (TMR) and detecting when a problem has occured and then using Dynamic Partial Reconfiguration (we talked about this yesterday) to reload that part of the device
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