The dual code security module (DCSM) is a security feature incorporated in this device. It prevents access and visibility to on-chip secure memories (and other secure resources) to unauthorized persons. It also prevents duplication and reverse engineering of proprietary code. Each CPU subsystem has its own dual zone CSM for code protection.

The following tests can be applied as diagnostics for this module (to provide diagnostic coverage on a specific function):

• Multibit Enable Keys for Control Registers
• Majority Voting and Error Detection of Link Pointer
• Software Read Back of Written Configuration
• Periodic Software Read Back of Static Configuration Registers
• Software Test of Function Including Error Tests
• CPU Handling of Illegal Operation, Illegal Results and Instruction Trapping
• CLA Handling of Illegal Operation and Illegal Results
• VCU CRC Check of Static Memory Contents
• External Watchdog
• Power-Up Pre-Operational Security Checks

The following test can be applied as a test-for-diagnostic on this module:

• VCU CRC Auto Coverage