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TMS320C6678: Error connecting to the target: Connect to PRSC failed

Part Number: TMS320C6678

我每次连接板子后,第一次进入debug可以,可是当推出后再次进入就会出现上面的报错,给板子断电再上电后就又可以了,请问是什么原因?是有寄存器没有设置吗?板子型号为标题所示,CCS版本5.5,仿真器如对话框所示