我运行spb 15.7中的pcb editor然后选择pcb design,然后打开一个brd文件,给我以下警告:“database was last saved by a higher tier tool, allegro expert. there may be constraints,rules and other design data that may be ignored in this tool.”' s$ e! f3 D) X, M4 [# L
看样子,allegro的expert和pcb design之间是不兼容的,而且expert是比pcb design要高端一些,+ Y- `" ^" B+ |# r% J4 \9 M M2 ]6 b9 ?
是这样的吗?