MAP是出现了下边的错误，请达人指教啊 ERROR:MapLib:93 - Illegal LOC on IPAD symbol "IORn" or BUFGP symbol "IORn_BUFGP"
(output signal=IORn_BUFGP), IPAD-IBUFG should only be LOCed to GCLKIOB site.
ERROR:MapLib:93 - Illegal LOC on IPAD symbol "IOWn" or BUFGP symbol "IOWn_BUFGP"
(output signal=IOWn_BUFGP), IPAD-IBUFG should only be LOCed to GCLKIOB site.
有人说应该加BUFG，这个BUFG应该怎么加？从哪加呀？ | 
