Interface clean up. WA for verilator tracing

Makefile

@@ -28,6 +28,9 @@ CPP_SRC=sim_$(PROJ).cpp
 
 TIMESCALE= --timescale '1ns/1ns'
 
+ifndef VERI_TRACE_DIS
+TB_DEFINES=+define+VERI_TRACE_EN
+endif
 UVM_DEFINES=+define+UVM_NO_DPI \
             +define+UVM_REPORT_DISABLE_FILE_LINE
 DISABLED_WARNINGS=-Wno-WIDTHTRUNC  -Wno-WIDTHEXPAND \
@@ -41,7 +44,9 @@ BUILD_ARGS=-I$(UVM_HOME)/src -I. \
         --error-limit 10 \
         --timing $(TIMESCALE) \
         --trace \
+        --top tb_top \
         +define+SVA_ON \
+        $(TB_DEFINES) \
         $(UVM_DEFINES) \
         $(DISABLED_WARNINGS) \
         +incdir+common +incdir+src/axi +incdir+tb \