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6748的uPP测试,内循环总是报错

Other Parts Discussed in Thread: TMS320C6748

在做6748的uPP测试,内循环总是报错。功能寄存器配置好之后,启动发送接收。UPISR寄存器中的ERRQ和ERRI总是至1,同时UPISR寄存器的EOLQ,EOWQ,EOLI,EOWI均至1,说明传输完成了吧,可报的DMA Channel Internal Error是什么意思呢?内循环的时候,AB通道的配置是一样的,16bits,Single data rate,START,ENABLE,WAIT还有什么需要注意的呢?望高人解答……