DC Warning 求助。

dc综合时，报以下Warning：The multiple port net xxx is not fixed by MPN. (OPT-207),请教高人解释一下这个warning的含义，怎么避免这个warning。谢谢！

OPT-207
NAME

OPT-207 (Warning) The multiple port net %s is not fixed by MPN.
DESCRIPTION

This warning message occurs when MPN fixes a multiple port net, it finds the net is located at top level and the variable ’compile_no_new_cells_at_top_level’ is set as true.
In most abutted designs, the variable ’compile_no_new_cells_at_top_level’ need be set as true when there is no empty space in top level . Otherwise, the new cells might be added to top by optimization and cause legalization failure.
By default, the variable is false and new buffer will be inserted to fix the multiple port net.
WHAT NEXT

For this case, it suggests user to mannually fix the multiple port net by revising the input design.

嗯，谢陈小编~

感谢小编分享。嘰靱豺佯銢

信元不够了。

信元不够了。懖鐮叆曨庮