请教ISE ucf约束文件错误
Xilinx ISE Design Suite 12.3器件是XC5VLX220
管脚约束文件这句话出错：
NET "cina"LOC = "G17";//输入数据
ERROR:MapLib:30 - LOC constraint G17 on cina<0> is invalid: No such site on the
device. To bypass this error set the environment variable 'XIL_MAP_LOCWARN'.
可是仔细查了datasheet，器件型号和管脚没选错啊？
具体见附件:
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