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关于28377S的UPP接口和EMIF接口使用疑惑问题

各位专家,我有这样一个需求,需要同时在DSP外挂SDRAM和FPGA,不知道FPGA是挂在EMIF总线上好,还是挂在UPP接口上好。主要是同一时间需要将FPGA传输给DSP的实时波形数据缓存到SDRAM中,大小可能会有8MByte.UPP和EMIF有什么不一样,两种方式那种实现比较好?