The explanation is:
The JTAG IR and DR scan-paths cannot circulate bits, they may be broken.
An attempt to scan the JTAG scan-path has failed.
The target's JTAG scan-path appears to be broken
with a stuck-at-ones or stuck-at-zero fault.
在网上看了些解决方案 大都是换根线 重启之类的 但是并没作用 芯片工作正常 就是无法连接jtag下载程序
mangui zhang:1.确定驱动目标器件工作正常目标器件电源正常clkout输出正常
2.有可能是某一个线接触不好或断开了或被强拉了
3.看看芯片复位等是否正常多次插拔USB端试试
The explanation is:
The JTAG IR and DR scan-paths cannot circulate bits, they may be broken.
An attempt to scan the JTAG scan-path has failed.
The target's JTAG scan-path appears to be broken
with a stuck-at-ones or stuck-at-zero fault.
在网上看了些解决方案 大都是换根线 重启之类的 但是并没作用 芯片工作正常 就是无法连接jtag下载程序
Seven Han:楼上说的比较全面了,另外建议您检查下TRSTn连接是否是好的。