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Altera_Forum's avatar
Altera_Forum
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9 years ago

up counter needs fixing - confused . simple question

Hi, this is a simple counter with asynch pre-set(not wired in diagram), enable, load and synch add +1. i can't figure the trick to get rid of one extra mux column and use the FF enable (where red arr...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

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But the enable overrides load, because they are two separate ifs. So actually its a 3:1 priority mux with cnt+1, new_data or cnt.

So while I agree I was initially wrong, and it should work with the cnt variable, the fact it's two separate ifs and not an elsif will be the problem.

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Yes that is a good point. It does not follow standard design

The way I view it is as follows:

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load enable cnt

0 0 no change of cnt

0 1 count up, may not get initialised

1 0 load value to cnt

1 1 count up

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