07-06-2009 05:28 AM
07-06-2009 03:42 PM
You can test the performance limits of the macrocell I/O by running a timing simulation. In this flow, the simulation is back-annotated with timing delay maximums so you can observe the expected hardware behavior against the input stimuli.
Alternatively, you can look up the internal timing parameters for the XC9536XL part in the datasheet. A combination of these parameters (combinatorial delay, register setup time, register clock to output valid time) play a role in what would be the shortest pulse the output can generate.
Hope this helps.