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ADS127L21: fpga程序驱动并采集AD数据,DRDY信号没有拉低是什么原因

Part Number: ADS127L21

在项目中采用了FPGA连接ADS127L21进行数据采集,驱动程序中设置了MCLK为24.576MHZ,sclk为12.288Mhz,下图为时序图,将start拉高,CS拉低,SDI信号写入了CONFIG1/2/3和FILTER1寄存器,也可以读出数据,但是就没有有效的DRDY信号出现,请帮忙分析一下是什么原因。