鄙人近来用MODELSIM SE 做仿真
做了一个除法器 然后仿真后 结果是正确的，但是出现大串大串的如下警告
Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).
下边这个是ISE综合时候产生的警告：
PACKER Warning: Lut divider__n0003<15>lut driving carrydivider__n0003<15>cy can not be packed with the carry due to conflict with the common signal requirement between the LUT inputs and the Carry DI/MAND pins. This would result in an extra LUT for a feedthrough.
望指点迷津 不甚感激！
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