:NgdBuild:604 - logical block 'issp' with type 'issp' could not be
   resolved. A pin name misspelling can cause this, a missing edif or ngc file,
   case mismatch between the block name and the edif or ngc file name, or the
   misspelling of a type name. Symbol 'issp' is not supported in target
   'spartan6'这个错误怎么改？
还有Quartus2的程序怎么植入到ISE中？