Simple things do not need to be documented. And heavy ones are something like trade secrets. There is low probability, that somebody might share their trade sec

Simple things do not need to be documented. And heavy ones are something like trade secrets. There is low probability, that somebody might share their trade secrets with you. There are checklists from fpga vendors for pcb design: https://www.xilinx.com/support/documentation/user_guides/ug483_7Series_PCB.pdf https://www.xilinx.com/support/documentation/user_guides/ug4... Chance, that you will produce the boards for systems with fpga by yourself, is very low.