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28034 JTAG下载不进去

我用XDS100V2下载程序,以前做过一批板子大概200台,下载程序重来都没问题,但是这一批做了200台左右,大部分能下载成功,大概有二三十台下不进去程序,现象很奇怪,点击CCS5上方的小爬虫按钮界面跳转到DEBUG界面后,不会出现进度条,也不会出现报警,界面就这样一动不动,一直处于等待的状态,除非我把下载器拔掉界面才会出现报警。请问这是什么原因?