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The use of serial control signal in a multi-function chip can reduce the number of chip input ports, thereby reducing chip area and saving costs. However, during chip testing, there may be errors in signal logic or timing generated by the external serial signal controller. This paper designs a verification circuit for a serial signal controller. It converts the serial signal generated by the controller into a parallel signal according to the requirements of the multi-function chip. It is convenient for the logic and timing test when the verification circuit is used. The verified serial signal controller can control the multi-function chip normally, and realize receiving and transmitting state, and set different phase shift and attenuation value.