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c6455 EDMA传输速率



我最近再调6455的板子,在用EDMA 搬移数据时,搬移时间过长,但又不知道问题出在哪里。

我用的板子上DSP时钟为1G DDR2时钟为500M,搬移数据量为8*666*33byte,AB-sync,搬移时间340+us,周期数346916

想问一下,搬移时间这么长是否正常?另,DMA的搬移速率如何估算?