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From what I understand, I need to finish the FPGA design in order to make a reliable Power Analyze. I will put the whole PCB on hold for a while and do it all over again later on, and also do it more thoroughly.
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Board designs that include FPGAs are iterative in that you first need to have an idea, then implement an initial version to determine what size FPGA you need, the support logic (external memory etc), and I/O. Then you start the board layout, and determine what is feasible in reality. Then go back and adjust your FPGA design as needed.
So don't be too concerned that you have to put the PCB design on hold, its just part of the process. You've now realized that the power supply design depends on what is operating inside the FPGA. You can either design a power-supply for the worst-case design, or design it for the design you expect to use. If you design for the worst-case, then you might get the PCB job done quicker, but the power-supply designs will be higher-current, and more expensive. So its a trade-off, and its a trade-off only you can make.
Cheers,
Dave
Honored Contributor
