58.5.8 ICM Register Write Protection

To prevent any single software error from corrupting ICM behavior, certain registers in the address space can be write-protected by setting the WPEN (Write Protection Enable), WPITEN (Write Protection Interrupt Enable), and/or WPCREN (Write Protection Control Enable) bits in the ICM Write Protection Mode Register (ICM_WPMR).

If a write access to a write-protected register is detected, the Write Protection Violation Status (WPVS) flag in the ICM Write Protection Status Register (ICM_WPSR) is set and the Write Protection Violation Source (WPVSRC) field indicates the register in which the write access has been attempted.

The WPVS bit is automatically cleared after reading ICM_WPSR.

The following register(s) can be write-protected when WPEN is set:

• ICM Configuration Register
• ICM Descriptor Area Start Address Register
• ICM Hash Area Start Address Register
• ICM User Initial Hash Value Register

The following registers can be write-protected when WPITEN is set:

• ICM Interrupt Enable Register
• ICM Interrupt Disable Register

The following register can be write-protected when WPCREN is set:

• ICM Control Register