Why does my 40GBASE-KR4 MAC PHY example design fail to simulate in VCS? - Why does my 40GBASE-KR4 MAC PHY example design fail to simulate in VCS? Description When executing the run_vcs.sh simulation script generated by software version 13.1 of the 40GBASE-KR4 IP example design, the simulation will fail to compile, with the following errors: Error-[SV-PPD] Package previously declared ../../../kr4_sim/alt_e40_e100/sv_xcvr_h.sv, 20 sv_xcvr_h Identifier 'sv_xcvr_h' is already declared in file "./../example/common/alt_e40_e_reco/alt_e40_e_reco/sv_xcvr_h.sv", line 20. ... ./run_vcs.sh: line 31: ./simv: No such file or directory Resolution This issue is due to duplicate module declarations in the simulation scripts. Edit the file < generated name >_sim/synopsys/vcs/vcs_setup.sh as detailed below to resolve this issue. Remove line 68: /alt_e40_e100/altera_xcvr_functions.sv \ and remove line 78: /alt_e40_e100/sv_xcvr_h.sv \ Then rerun run_vcs.sh . This issue will be fixed in an upcoming release of the Quartus II software. Custom Fields values: ['novalue'] Troubleshooting novalue False ['Simulation'] ['FPGA Dev Tools Quartus II Software'] novalue 13.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']