Reading about FPGAs, if I understand correctly, they are basically fully configurable logic gate circuits. Being this, one can design anything with them. One can design everything in the most customized way possible and hence, meet the same ends in a vastly more efficient manner which can be get using a microcontroller. Having this, it looks like an FPGA beats a microcontroller any time, any day. So my question is, if FPGAs are really this awesome, what keeps them from being much more prevalent than microcontrollers? From this point of view, to me it seems like FPGAs should have wiped out microcontrollers a long time ago. So why is this not the case? Is it the cost, difficulty to program an FPGA, or entirely something else?
Electronic – Why aren’t FPGAs ubiquitous
fpgamicrocontroller
Best Answer
You are ignoring a lot of factors that go into making design choices:
The main advantages of FPGAs versus micros is that they are faster and can do more things in parallel. Other than that, you'd rather use a micro. Therefore in the design process, you usually start out with a micro, then grudgingly go to a FPGA when you really need the speed and/or concurrent high speed operation. Even then, you implement only the speed-critical parts in a FPGA, and leave the lower speed control functions and the like in the micro.