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Altera_Forum's avatar
Altera_Forum
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16 years ago

overflow and underflow of CVI&CVO

hi, I am dealing with ip core clocked video(CVI) in and clocked video out(CVO). And there is a pin named overflow on CVI, and a pin named underflow on CVO, my question is when an overflow or under...
Altera_Forum's avatar
Altera_Forum
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16 years ago

The pins are active high (high when overflow/underflow occurs).

The CVI will overflow if data is it's internal FIFO fills up before it has a chance to send it's data to downstream components.

The CVO will underflow if it is outputting data and it's internal FIFO becomes empty because the upstream components were not able to supply it quickly enough.

Jake