你在你引脚声明的下面加上这句话 NET "cp" CLOCK_DEDICATED_ROUTE = FALSE; 因为这是时序约束造成的。
最后的样子是下面：
NET "cp" CLOCK_DEDICATED_ROUTE = FALSE;
NET "cp" LOC = B18;
NET "din" LOC = G18;
NET "dout[0]" LOC = J14;
NET "dout[1]" LOC = J15;
NET "dout[2]" LOC = K15;
NET "dout[3]" LOC = K14;
NET "dout[4]" LOC = E17;
NET "dout[5]" LOC = P15;
NET "dout[6]" LOC = F4;
NET "dout[7]" LOC = R4;
NET "rst" LOC = H13;
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