综合的问题

Lydia_yy

代码写完了，功能仿真没问题，综合时出现如下提示：

ERROR:Xst:528 - Multi-source in Unit <en> on signal <Photo_Q1<7>>
Sources are:
   Output signal of FDRE instance <Photo_Q1_7>
   Signal <Photo_Q1<7>> in Unit <en> is assigned to GND

ERROR:Xst:528 - Multi-source in Unit <en> on signal <Photo_Q1<6>>
Sources are:
   Output signal of FDRE instance <Photo_Q1_6>
   Signal <Photo_Q1<6>> in Unit <en> is assigned to GND
………………………………错误一直延续

ERROR:Xst:528 - Multi-source in Unit <en> on signal <Photo_Q1<1>>
Sources are:
   Output signal of FDRE instance <Photo_Q1_1>
   Signal <Photo_Q1<1>> in Unit <en> is assigned to GND
ERROR:Xst:528 - Multi-source in Unit <en> on signal <Photo_Q1<0>>
Sources are:
   Output signal of FDRE instance <Photo_Q1_0>
   Signal <Photo_Q1<0>> in Unit <en> is assigned to GND

请高手指点一下吧