7.6.3.3 Write Fuses

The fuses may only be “programmed,”, that is, written from one to zero. The write fuses operation is allowed only after successfully presenting the secure code (Write 7 password). The fuses must be blown sequentially: FAB must be blown first, CMA may be blown only if FAB is zero, and PER only if CMA is zero. After this command, the host must perform ACK polling.