3 ms·
including, IIRC, at least one FPGA-based circuit that had a blob of logic not connected to anything else (ie could not possibly be involved in the logical funct
by niccl 2y ago
including, IIRC, at least one FPGA-based circuit that had a blob of logic not connected to anything else (ie could not possibly be involved in the logical functioning of the circuit), but when removed the implementation stopped working. So the actual circuit wasn't a sensible design option, just a very implementation-specific local minimum.
I think the original design challenge was something like a tone discriminator circuit. I can't recall the details
- robwwilliams 2y agoYes, another case like this in which stray capacitance/inductances between traces was optimized in making an effective FPGA. Initial the developers had no idea why it worked so well. They found it to be exceedingly temperature sensitive. That clue gave them the answer.