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C6678中通过EMIF与FPGA通讯

    c6678通过EMIF接口与FPGA做EDMA通讯,软件测得速度是50MB/S,从FPGA端看接口时序速度为16MB/S,请问这是怎么回事,另外源地址为EMIF,目的地址为L2和源地址为L2,目的地址为EMIF时,从FPGA中看到得时序为什么是相同的,都是CE1与WE为负脉冲,OE为常高。