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有关于DM642的地址映射问题

我有个DM642的想问下大家,现在想要从上位机的地址利用QDMA往EMIF接口外接的一个FPGA的RAM里搬数而不经过DSP外挂的SDRAM和片内存储器L2,这样可行吗,如果可行的话要怎么找到上位机地址映射到DSP的那个地址呢?还是说上位机必须先通过PCI传数给DSP的内存在往外搬数呢?谢谢各位大神了!