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DSP C6678 EMIF例程改到BIOS系统下运行传输错误

K1_STK_v1.1下的EMIF例程,改到BIOS系统下运行,在FPGA那边通过chipscpoe抓取会发现每次发送的数据后面都会再带上14个其他的随机数据。如下图,比如往EMIF空间0x74000000写一个数据0x1234,FPGA会抓取到15次有效信号,从而会读取到15个数据。请问各位专家这会是什么原因呢?