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TMS320C6678: DDR 读写问题

Part Number: TMS320C6678


问题:

           将数据从L2写入到DDR3中和从DDR3中读到L2中,后者的耗费的时间是前者的20倍左右,请问这属于正常速率吗?或者说可能怎么优化提升从DDR3读到L2的速率呢?有什么案例或者文档可供参考吗?