For hierarchical design rule checking(DRC),false errors may result from inadequate graph operation or incomplete graph of the cell while the environment in which the cell is called is not considered during checking.

• 分级式DRC在检查时，可能因为运算不当而改变图形形状，或单元本身存在不完整的图形，检查中又未能考虑单元的调用环境而产生伪错。