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6678 EDMA3传输数据块大小问题

参考论坛提供的EDMA传输工程,将数据从DDR3中搬移到MSM中,当数据块为A_cnt =,B_cnt=4时可以完成整块的传输,但是扩大数据块A_cnt = 44100,B_cnt=4时却只能搬移44100个数据,请问这个是为什么呢?