07-05-2017 07:12 PM
I use the following constraints in .xdc
set_property MAX_FANOUT 100 [get_cells myreg]
Could you tell me when it will be effective, by which I mean when vivado will replicate registers based on this constraint? during opt_design, place_design, phys_opt_design or route_design?
07-05-2017 07:47 PM
MAX_FANOUT is a Synthesis constraint, which will take effect in Synthesis process.
It does not affect any implementation step.
Please refer to UG901 and AR62162.