# Test exception path SDC commands for code coverage read_liberty ../../test/nangate45/Nangate45_typ.lib read_verilog sdc_test2.v link_design sdc_test2 # Setup clocks create_clock -name clk1 -period 10 [get_ports clk1] create_clock -name clk2 -period 20 [get_ports clk2] # Setup basic delays set_input_delay -clock clk1 2.0 [get_ports in1] set_input_delay -clock clk1 2.0 [get_ports in2] set_input_delay -clock clk1 2.0 [get_ports in3] set_output_delay -clock clk1 3.0 [get_ports out1] set_output_delay -clock clk2 3.0 [get_ports out2] ############################################################ # set_false_path ############################################################ # False path from port to port set_false_path -from [get_ports in1] -to [get_ports out1] # False path with -through set_false_path -from [get_ports in2] -through [get_pins and1/ZN] -to [get_ports out1] # False path with rise_from/fall_to set_false_path -rise_from [get_ports in3] -fall_to [get_ports out2] # False path between clock domains set_false_path -from [get_clocks clk1] -to [get_clocks clk2] # Report to verify false paths report_checks -from [get_ports in1] -to [get_ports out1] ############################################################ # Reset all exceptions and re-add other types ############################################################ unset_path_exceptions -from [get_ports in1] -to [get_ports out1] unset_path_exceptions -from [get_ports in2] -through [get_pins and1/ZN] -to [get_ports out1] unset_path_exceptions -rise_from [get_ports in3] -fall_to [get_ports out2] unset_path_exceptions -from [get_clocks clk1] -to [get_clocks clk2] ############################################################ # set_multicycle_path ############################################################ # Setup multicycle set_multicycle_path -setup 2 -from [get_clocks clk1] -to [get_clocks clk1] # Hold multicycle set_multicycle_path -hold 1 -from [get_clocks clk1] -to [get_clocks clk1] # Multicycle from specific pin set_multicycle_path -setup 3 -from [get_ports in1] -to [get_ports out1] report_checks -from [get_ports in1] -to [get_ports out1] # Unset multicycle paths unset_path_exceptions -setup -from [get_clocks clk1] -to [get_clocks clk1] unset_path_exceptions -hold -from [get_clocks clk1] -to [get_clocks clk1] unset_path_exceptions -setup -from [get_ports in1] -to [get_ports out1] ############################################################ # set_max_delay / set_min_delay ############################################################ set_max_delay -from [get_ports in1] -to [get_ports out1] 8.0 set_min_delay -from [get_ports in1] -to [get_ports out1] 1.0 report_checks -from [get_ports in1] -to [get_ports out1] # Unset the delay constraints unset_path_exceptions -from [get_ports in1] -to [get_ports out1] ############################################################ # group_path ############################################################ group_path -name group_clk1 -from [get_clocks clk1] group_path -name group_io -from [get_ports in1] -to [get_ports out1] report_checks -path_group group_clk1 report_checks -path_group group_io # Final report report_checks