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afe7225 spi question

你好:我用了afe7225,我看了下手册,

1:如果我的输入时钟是差分的话,接收和发送是不是都不用配置寄存器了,我没有片与片的同步,也没有变采样率的要求?

2:我什么寄存器也没有配,加电后发现其有输出,它的输出是从哪里来的呢?

3:TX发送时,clkin和da的时钟一样就可以了吧?不用再对寄存器进行配置来把FIFO bypass掉吧?