Using the Microprocessor MMU for Software Protection in Real-Time Systems

System designers constantly face engineering trade-offs between system speed, integrity, and maintainability. With the increasing performance of microprocessors, and the ease of systems configuration and enhancement in software, as opposed to hardware, more of the actual system is implemented in software. Products are now designed by teams of programmers, working on multiple programs, with all the programs coexisting on one microprocessor. With more programs running on one processor, a practice of "locking the doors" becomes necessary. Without protection, a single program bug could leave a trail of destruction that would compromise the integrity of the entire system.

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