5 ms·
No, they retain state. We used an Altera DE1 in school and it retained our burnt in program until erased or reprogrammed
by stumpylog 8y ago
No, they retain state. We used an Altera DE1 in school and it retained our burnt in program until erased or reprogrammed
- zwieback 8y agoProbably burned into an external EEPROM or flash, the FPGA fabric itself still has to be configured by some external means. It's pretty fast but on-the-fly reprogramming of the FPGA logic is still an issue where you want to very quickly switch the logic on the FPGA.
- monocasa 8y agoMost FPGAs I've seen go out of their way to allow you to reconfigure while it's running, you just have to jump through a few extra hoops and get down and dirty with the floor plan.
- kevin_thibedeau 8y agoOlder Altera CPLDs and Actel/Microsemi antifuse based FPGA families have nonvolatile configuration within the fabric. They enjoy the benefit of near instant start up since there is no programming phase to transfer a bitstream from an external flash part.
- spilk 8y agosome have the configuration memory on-die as well to keep part count down. Also good to help protect your bitstream, but this isn't infallible of course.