dennisi123
Newbie level 1
Hello,
I've got warning messages during post simulation with NCVerilog.
After I dumped out sdf and verilog netlist from ICC,I started NCverilog simulation with the command ncverilog -f ncscript ,then I got many warnings as follows:
ncelab: *W,SDFNL1 (/Plib/digital/chart35/layout_used_SE/lib/chart35.v,11729|5): Attempt to annotate a negative value to a 1 limit timing check in instance (shiftreg_test.t1.u3.latch238_reg_15_), setting to 0 <./final1.sdf, lin
e 253950>.
...........
I have no idea how to fix them because I don't know what does these warnings mean.I have used the option +neg_tchk,but it didn't work.
It would be a big help for me if someone recommend me a good reference for solving this problem.
Thanks a lot !
dennis
I've got warning messages during post simulation with NCVerilog.
After I dumped out sdf and verilog netlist from ICC,I started NCverilog simulation with the command ncverilog -f ncscript ,then I got many warnings as follows:
ncelab: *W,SDFNL1 (/Plib/digital/chart35/layout_used_SE/lib/chart35.v,11729|5): Attempt to annotate a negative value to a 1 limit timing check in instance (shiftreg_test.t1.u3.latch238_reg_15_), setting to 0 <./final1.sdf, lin
e 253950>.
...........
I have no idea how to fix them because I don't know what does these warnings mean.I have used the option +neg_tchk,but it didn't work.
It would be a big help for me if someone recommend me a good reference for solving this problem.
Thanks a lot !
dennis