ise 出错

chenlidong

ise里这个出错怎么解决啊？ 求大神帮帮忙啊。
Place:1073 - Placer was unable to create RPM[BUFDS_RPMs] for the component
   MGTCLKIN1 of type BUFDS for the following reason.
   The reason for this issue:
   All of the logic associated with this structure is locked and the relative
   placement of the logic violates the structure. The problem was found between
   the relative placement of BUFDS MGTCLKIN1 at site IBUFDS_GTE2_X0Y1 and IPAD
   SFP_MGT_CLK1_C_N at site IPAD_X1Y9.  The following components are part of
   this structure:
      BUFDS   MGTCLKIN1
      IPAD   SFP_MGT_CLK1_C_N