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Altera_Forum
Honored Contributor
Honored ContributorIOBuff Usage
Hi, I have input to output direct mapping in my design. I am not able to time close it to 5ns because of IC Delay. input is in 3.3 V domain: set_instance_assignment -name IO_STANDARD "3....
Altera_ForumHonored Contributor
Honored ContributorWow, that is a huge incremental delay in the output I/O buffer. Does that pin have some other function attached to it or some other assignment you've created to account for that delay? Do you see an over 6 ns delay on other outputs in your design? Do you have any set_output_delay constraints in your .sdc file (which you should)?
