The dual code security module (DCSM) is a security feature incorporated in this device. The module prevents access and visibility to on-chip secure memories (and other secure resources) to unauthorized persons. The module also prevents duplication and reverse engineering of proprietary code. Each CPU subsystem features a 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):

• DCSM1 - Multibit Enable Keys for Control Registers
• DCSM2 - Majority Voting and Error Detection of Link Pointer
• DCSM5 - Software Read Back of Written Configuration
• DCSM3 - Periodic Software Read Back of Static Configuration Registers
• DCSM4 - Software Test of Function Including Error Tests
• DCSM6 - CPU Handling of Illegal Operation, Illegal Results and Instruction Trapping
• DCSM8 - VCRC Check of Static Memory Contents
• DCSM9 - External Watchdog
• DCSM11 - Hardware Redundancy