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why the ReadOnly Bit DeviceEN in CSW register changed?(AM3352)

Other Parts Discussed in Thread: AM3352

Hi:

    The readonly bit ---DeviceEN in the register csw(bit[6]) changed to 0 after AM3352 halted. before am3352 enter debug state, DeviceEN is 1,.When DeviceEN is 0 MEM-AP can not  be accessed , how i can change this bit back to 0b1?

     thanks!