Hi Steve and all, I tried to use 2 different versions for RTL syntax check. 20060409 failed to compile.
================================================== [EMAIL PROTECTED] /eda/iverilog-0.8-1/bin/iverilog -tnull -c v_files [EMAIL PROTECTED] /eda/iverilog-20060409/bin/iverilog -tnull -c v_files ivl: elab_net.cc:2469: virtual NetNet* PETernary::elaborate_net(Design*, NetScope*, unsigned int, const NetExpr*, const NetExpr*, const NetExpr*, Link::strength_t, Link::strength_t) const: Assertion `dwidth == width' failed. sh: line 1: 4619 Done /usr/bin/iverilog-20060409/lib/ivl/ivlpp -L -D__ICARUS__=1 -f/tmp/ivrlgf278ebb 4620 Aborted | /usr/bin/iverilog-20060409/lib/ivl/ivl -C/tmp/ivrlhf278ebb -C/usr/bin/iverilog-20060409/lib/ivl/null.conf -- - [EMAIL PROTECTED] top]$ ================================================== Thanks a lot for your help. Best regards, Steven.