Honored Contributor
Honored ContributorHi,
The IOs are constrained using set_input_delay and set_output_delay. One constrain with the -min flag and one contrain with the -max flag. In that way you model then valid sampling window for input signals. Similarly you constrain the output to make sure that the window is large enough for the receiveing device. Check the setup and hold requirements in the data sheets of the receiving devices. Note that you use a virtual clock that models the clock in the other device as a reference in the constraint. More details about set_input/output_delay is found in the SDC cookbook: http://www.altera.com/literature/manual/mnl_timequest_cookbook.pdf Cheers
