Using mechanical switches for a user interface is a ubiquitous practice. However, when these switches are actuated, the contacts often rebound, or bounce, off one another before settling into a stable state. Several methods exist to deal with this temporary ambiguity, using either hardware or software. Here, we look at correcting this problem with a simple digital logic circuit (a common task when interfacing FPGAs or CPLDs with pushbuttons or other switches). Generic VHDL code to implement this methodology is included.

DBounce.vhd

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