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:ConstraintSystem:59 - Constraint <NET"DAB_CS " LOC=“L22”|>
[ucf410t.ucf(373)]: NET "DAB_CS " not found. Please verify
that:

  1. The specified design element actually exists in the original design.
  2. The specified object is spelled correctly in the constraint source file.
    出现这个问题是因为.ucf中的引脚约束的名称后面有空格,去掉即可

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