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用EDMA3和memcpy从6670开发板的L2(core0):10800400向DDR3:0x80000000传数据的问题

当利用EDMA3和memcpy从L2向DDR3传数据时,如果我从L2的0x10800400传1MB的数据到DDR3中的0x80000000位置,DDR3中其他位置0xA0000000、0xC0000000和0xE0000000处也会出现同样的数据,且当数据量增到512MB以上时0x80000000处数据会被超过512MB的数据覆盖掉,请问是什么原因呢?

谢谢各位专家