想仿真IR-Drop,选用的工具:allegro PCB SI XL,仿真Static IRDrop,在PDN Analysis界面设置相关的参数后,点击Analyze,出现错误:Fail to the static irdrop analysis for given power/ground nets. 查看log信息,Fail to solve umf matrix in 64bits with error (-31) 我是仿真新手,请大家帮忙指导指导~ ; M' p/ j U" m! }" b- i, `