DC Warning 求助。。

manxxxxx

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！

陈涛

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.

manxxxxx

回复 2# 陈涛


    嗯，谢陈版主~

zhy910827

感谢楼主分享。嘰靱豺佯銢

zhy910827

信元不够了。。。

zhy910827

信元不够了。。。懖鐮叆曨庮