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Altera_Forum
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12 years ago

Cyclone V - Megafunction "ALTIOBUF" Error

hello, i have some problems using QuartusII megafuction "ALTIOBUF". <I'm using Cyclone V(Cyclone V GX Starter Kit) and Quartus 13.1> I create a new megafunction(ALTIOBUF-select 'As an output ...
Altera_Forum's avatar
Altera_Forum
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12 years ago

If you wish to use the 'Dynamic Delay Chain' feature of the ALTIOBUF primitive, you need additional constraints in order to enable it to go through fitting.

Refer to the User Guide for the ALTIOBUF: i/o buffer (altiobuf) megafunction user guide (http://www.altera.com/literature/ug/ug_altiobuf.pdf). Read through the 'Assignments Necessary For Dynamic Delay Chain Usage' section on page 1-7. This explains the additional constraints you need.

Regards,

Alex