1. A method comprising: executing program instructions in a computer system, wherein the program instructions execute to perform: identifying a plurality of pads of an integrated circuit responsive to one or more design files that describe the integrated circuit using a hardware description language (HDL); automatically generating a corresponding pad ring description for a programmable logic device implementation responsive to identifying the plurality of pads, the corresponding pads in the programmable logic device implementation having different associated circuitry to control signals on the pad than the circuitry associated with the plurality of pads in the integrated circuit; and stitching the associated circuitry for the corresponding pads of the programmable logic device implementation to the one or more design files for processing into a bitstream to be downloaded to one or more programmable logic devices.