用k2＿viewer替换GDS

Replace database with k2＿viewer

当一个芯片或一个大版图需要改版,而实际只需要改动几个具体模块,可以使用k2_vi ewer对整个GDS进行操作,可以先把模块版图改好, PVS验证完导出模块GDS,在k2_vi ewer界面里把需要改动的模块从整个大的版图里替换成新的版图,这个方法中没有涉及对整个芯片或大版图的GDS导入导出,省时快捷方便安全高效。

when a whole chip or big layout need to be engineering change order(ECO), the changes are located in some sub-block, the best way is to modify the sub-block first, stream out the sub-block GDS after finishing PVS check, replacing the old GDS with the updated GDS from the whole GDS with tool k2_viewer,there is not streaming in/streaming out the whole GDS, this is method is efficient, fast, easy and safe.