求助：关于VIO的一个error
单端信号经过iodelay后给obufds变差分信号，然后我把P端输出给了vio，翻译的时候一直报这个错误：NgdBuild:809 - output pad net 'OUTP<0>' has an illegal load:
pin I0 on block VIO/U0/I_VIO/GEN_ASYNC_IN.ASYNC_IN_CELL/USER_MUX with
type LUT3,
pin C on block VIO/U0/I_VIO/GEN_ASYNC_IN.ASYNC_IN_CELL/U_RISING with
type FDC
求大神指点迷津！
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