How the FPGA is different from a microcontroller

In order to use it, you will have to write a software program and roll it up to hex files, which you will then load, on the microcontroller. Microcontrollers store programs in flash memories. These programs will be stored for a long time until they are replaced or erased. With a microcontroller, you will have some control over your written software program. But FPGAs are very different. When you buy fpga, you will be the one to design the circuit. FPGA does not have processors for running software on, meaning that you will have to design them. 

With FPGA, you can configure it to be something simple like a gate or complex like multi-core processor. In order to create your intended design, you will first have to write a Hardware Description Language (HDL) into bit file that you will be able to use to start configuring the FPGA. The only downside to the FPGA is that it stores its configurations in RAM (random access memory) and not flash memory. This means that if power is lost during the configuration, the FPGA will lose its configuration. Therefore, you will have to configure the FPGA every time you have power problems.

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