SIR System Initialization Registers. 0x40000400 read-only 0x00 0x400 registers STATUS System Initialization Status Register. 0x00 read-only CFG_VALID Configuration Valid Flag. 0 1 read-only CFG_ERR Configuration Error Flag. 1 1 read-only USER_CFG_ERR User Configuration Error Flag. 2 1 read-only ADDR Read-only field set by the SIB block if a CRC error occurs during the read of the OTP memory. Contains the failing address in OTP memory (when CRCERR equals 1). 0x04 read-only ADDR 0 32 FSTAT Function Status Register. 0x100 read-only FPU FPU Function. 0 1 TRNG TRNG Function. 14 1 DS_ACK DeepSleep Acknowledge. 15 1 SFSTAT Security Function Status Register. 0x104 read-only SECFUNC0 Secure Function 0 Status. 0 1