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28335的McBSP的DMA控制问题

Other Parts Discussed in Thread: ADS1274

28335和24位AD芯片采用McBSP通信,AD采样速率为5K,想用DMA控制,减少CPU的使用,结果在文献中看到这句话: Word Size: 16-bit or 32-bit (McBSPs limited to 16-bit),MCBSP采用DMA控制限制为16位,那么就不能用DMA控制了。外部的AD要实时和DSP通信,那么还有没有其它的方法实现此功能?