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.”) L4 j+ P# z9 @2 F1 v1 F
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, - s( @$ `: Q- I% Z" x1 s是这样的吗?