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ads5407同步问题

Other Parts Discussed in Thread: ADS5407

目前调试两个ADS5407的同步,有以下问题:

1、关于SYNCOUTA/B的output,手册中说是由sync的input的信号触发的 5-bit counter,但是我这边FPGA用250M的时钟采集到的SYNCOUT的输出信号不是一个规律的周期脉冲?

2、输入SYNC管脚的信号,和模拟输入有关系吗?调试发现当不给模拟输入时,即使给了SYNC输入也没有SYNCOUT的输出?

以上两个问题,均试过one-time和periodic signal,结果都是一样。