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DS90UB948-Q1: BIST TEST

Part Number: DS90UB948-Q1

Tool/software:

 How should the BIST test be conducted? The problem we are now having is that after 0X24 writing 0x01 to the deserializer 948 register, it enters BIST mode, and then it cannot end BIST mode after entering 0x0 It shows write error (DS90UB948 chip GPIO[3:0] if floating)