%Warning-ASSIGNDLY: t/t_delay.v:25:11: Ignoring timing control on this assignment/primitive due to --no-timing : ... In instance t 25 | assign #(1.2000000000000000) dly1 = dly0 + 32'h1; | ^ ... For warning description see https://verilator.org/warn/ASSIGNDLY?v=latest ... Use "/* verilator lint_off ASSIGNDLY */" and lint_on around source to disable this message. %Warning-ASSIGNDLY: t/t_delay.v:26:11: Ignoring timing control on this assignment/primitive due to --no-timing : ... In instance t 26 | assign #(sub.delay) dly3 = dly1 + 1; | ^ %Warning-ASSIGNDLY: t/t_delay.v:33:18: Ignoring timing control on this assignment/primitive due to --no-timing : ... In instance t 33 | dly0 <= #0 32'h11; | ^ %Warning-ASSIGNDLY: t/t_delay.v:36:18: Ignoring timing control on this assignment/primitive due to --no-timing : ... In instance t 36 | dly0 <= #0.12 dly0 + 32'h12; | ^ %Warning-ASSIGNDLY: t/t_delay.v:44:18: Ignoring timing control on this assignment/primitive due to --no-timing : ... In instance t 44 | dly0 <= #(dly_s.dly) 32'h55; | ^ %Warning-STMTDLY: t/t_delay.v:50:10: Ignoring delay on this statement due to --no-timing : ... In instance t 50 | #100 $finish; | ^ %Warning-UNUSEDSIGNAL: t/t_delay.v:23:12: Signal is not used: 'dly_s' : ... In instance t 23 | dly_s_t dly_s; | ^~~~~ %Warning-UNUSEDSIGNAL: t/t_delay.v:57:13: Signal is not used: 'delay' : ... In instance t.sub 57 | realtime delay = 2.3; | ^~~~~ %Warning-BLKSEQ: t/t_delay.v:43:20: Blocking assignment '=' in sequential logic process : ... Suggest using delayed assignment '<=' 43 | dly_s.dly = 55; | ^ %Error: Exiting due to