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DSP5509a读取串行flash芯片程序问题

我按照表格里面的bootm[0:3]里面的Serial EEPROM(SPI-16BIT)设置了启动模式,用示波器测到片选端有高电平,但是DSP还是没有读取flash芯片的程序,请问这个是还有什么问题呢?应该如何操作呢?