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LMX2571: readback功能

Part Number: LMX2571

您好,我们使用了fpga的一个spi总线,挂载了四个lmx2571。fpga做spi master ,lmx2571做spi slave。四片lmx2571的片选信号相互独立,sclk、miso、mosi是共享的。测试过程中,我们发现无法读取lmx2571的寄存器。我们用示波器查看片选信号是正常的。查看了论坛及LMX2571手册,未发现手册中有明确的说明哪个寄存器可以把muxout配置成三态模式,请问lmx2571的muxout是否支持三态模式,配置哪个寄存器呢?