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Altera_Forum's avatar
Altera_Forum
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13 years ago

glitch problem...

Hi. I want to know difference between two code , especially glitch problem. I saw a two examples in the book and the book said first code has a glitch, but second code doesn't have the glitch, and...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

it will be to do with synthesised logic. The first uses an async reset that means the counter bits will not all got to '0' at exactly the same time, and any logic generated from it will potentially glitch for a short period (in the order of a few ns, or even ps)

the second uses a synchronous reset, which should set all values simultaneously.