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CCS/PGA411-Q1: pga411: register state 4 error

Part Number: PGA411-Q1

Tool/software: Code Composer Studio

hello,  the register of pga411, STATE 4 ,  the bits, SOUTA ,SOUTB, SOUTZ,  will be error occasionally.

sometime SOUTA error , sometimes SOUTZ error. 

and I used the scope to test the wave of PIN OUTA /OUTB/OUTZ, the waves may be error.

what is the reason?

thanks