testset

摘要： set_clock_latency models board-level clock delays most useful is for I/O constraints,derive_clock_uncertainty calls out individual set_clock_uncertainty for every clock transferderive_clock_uncertainty’s individual calls of set_clock_uncertainty occur when the timing netlist is being updated, which 阅读全文

摘要： periodsetup/holdapplied toadd4create_clock√√nodesecond assignment will be ignoredCREATE_GENERATED_CLOCK√√nodeignore the new constraint and issue a warningDERIVE_PLL_CLOCKS√√nodeSET_INPUT_DELAY/SET_OUTPUT_DELAY√node(external)there is another external register connected to the portoverride the first t 阅读全文

摘要： periodsetup/holduncertaintyapplied toaddcreate_clock√√nodesecond assignment will be ignoredCREATE_GENERATED_CLOCK√√nodeignore the new constraint and issue a warningDERIVE_PLL_CLOCKS√√nodeIf a create_clock or create_generated_clock apply a clock to a node that already has a clock on it from a previou 阅读全文

摘要： period setup/hold uncertainty applied to add create_clock √ √ node second assignment will be ignored ... 阅读全文