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Altera_Forum
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9 years ago

ALTDDIO_OUT primitive usage internally

Hi, I am using the Output DDR interface in one of my submodules in the hierarchy. I see that the output register is not set in spite of me selecting the option "Registers powerup high". Also, ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Sorry if I explained it wrong. What I meant was that I removed the ODDR buffer and wrote one on my own.

You are right, the ODDR buffer if used internally gives a functional error (although the synthesis tool does not see that and does not throw out any errors/warnings).

Bottom line - ODDR2 in cycloneV does not work inside.