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Altera_Forum's avatar
Altera_Forum
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11 years ago

Debounce Verilog ( I have some questions)

hello everyone. i'm new to verilog programming. i have some questions on debouncer. I already get the concept of debouncing. but how do i compute for the length of the register that i would be using....
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

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The filter time must be longer than the bouncing settling time.

An unfiltered pushbutton is likely to have bouncing spikes extending in the 100us - 1ms range, so you need to sample the level for a few ms.

With a 24MHz and 8 samples you achieve a filter "low pass" frequency of about 3MHz which is totally ineffective.

You must use a lower frequency sampling: if you keep the 8 samples, choose a sample rate around 10kHz.

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thanks. but, what do you mean? i change my 24MHz clock? or the number of samples? i tried increasing the number of samples, still i get same results. please help.