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C6455 PCI Master Read



我的设备是一块有C6455的板卡和一块PC主机通过PCI通信,DSP 通过 Master方式向PC端写没有问题,PC向DSP读、写也没有问题。但是DSP 采用EDMA主动读PC的内存,读回来的数据全是0(PC端数据不是0),采用地址直读的方式,读出来的数据也不对。跪求大神帮忙解决!!!谢谢!!!