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AM5728无法连接JTAG

Other Parts Discussed in Thread: AM5728

将boot0-5都置1进入JTAG模式,加电后,仿真器连接不上。错误提示是TCLK的频率太低或太高了。检查发现AM5728的复位输出引脚rstoutn输出了频率为50HZ的方波,说明AM5728启动后又复位了。但是当sysboot配置在SD卡启动模式时,系统能够成功加载,并且能够绑定dsp。请问,JTAG模式时,仿真器连接不上的故障原因是什么?谢谢!