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in my opinion,you should define the pins of FPGA first.
Then you should configure your FPGA
There are 3 classical ways to configure your FPGA:
1)You use a cable from your PC to the FPGA, and run a software on your PC.
2)You use a microcontroller on your board, with an adequate firmware.
3)You use a special PROM on your board, connected to the FPGA, that configures it automatically at power-up (FPGA vendors have such special PROMs in their catalogs.
Last,you can verificaton the function which you intended on board.
Some modern "Hybrid" FPGAs contain some DSP blocks that can be useful for doing such an application....
Any way for your design, you need first to select an algorithm to implement, then you use your preferred HDL to implement this algorithm, you can start from a Top-Down approach.
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