Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

push button

Hello I make a program in VHDL and i need a push button. I don't kwon how i must do the follow thing. When i push de button and let go then must count my counter en when i push de but...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Search for "debounce" to see what Dave is talking about. The glitching he is referring to sometimes looks like this: http://en.wikipedia.org/wiki/file:switch_bounce.jpg

So from the picture you can see a single button push may be detected multiple times. So that counter logic Dave is talking about makes sure the button is pushed long enough to filter out all the bounce (glitches).