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IIS McBSP 6748

  DSP把McBSP配置成IIS模式,从FPGA中接收数据,FPGA中帧时钟为高是发1,低时发0,DSP中Receive frame-synch pulse is active high。DRR接收数据正确,但是通过EDMA搬移后数据成了0-1-0-1-0-1……。请问可能是什么原因造成的,而且搬移后的前两位数据有时是错误的,比如,会出现6738-0-0-1-0-1-0-1这样的数据。