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If you're doing device-centric constraints(like Tsu and Th on the input ports), then on the output side you want to use Tco and Min Tco constraints. Most user's just apply Tco and Min Tco directly to the port(in the To column, as all single-point assignments are there), and leave it at that. (And as always look at TimeQuest when you get a chance...)
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But i want to specify a certain Tsu and Th on the OUTPUT port, not on the input port. I.e. i want to ensure that my external FIFO i'm writing data generated by the FPGA has the correct setup and hold times (required around 5 ns while now only 1ns). Tco should only specify the time data is earliest *available* after clk, not Th...?
I hope i'll get the hang of this soon, i'm still a newbie...
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