We use the AD9523-1 clock generator in our design. But sometimes I get an error. We are using the MSP430 to configure the AD9523-1. After the system is turned on, this error occurs, we read all registers as FF. When this error comes the REFA clock is ok but the output clocks are missing. I checked all powers of the AD9523-1 , it's ok. We used the another card but this problem occurs again.