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28335外部总线写FPGA,FPGA应该在写信号的上升沿还是下降沿锁存数据呢?从XINTF文档中图14,下降沿时数据有刚刚有效,怕此时读取数据总线不保险,上升沿后数据持续时间又太短。频率一高容易出问题。