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dsp c5517 外部中断0 触发问题?

Expert 2137 points


dsp c5517 外部中断0在使用的过程中 我发现它是低电平触发,    

我现在INT0管脚连接到fpga上,   fpga给INT0的时序是 高电平---低电平 ,低电平持续5ns,又变成高电平,我发现dsp有的时候捕捉不到下降沿中断, INT0响应中断具体要求是什么?