The features include Real Time Non-intrusive Instrumentation (RTNI) and Behavioral Verification Technology (BVT) and do not interfere in any way in the operation of the system. RTNI increases developer productivity by enabling direct observation of processor operation during system development, support and maintenance. BVT is used to automatically test the correct functional behavior of the integrated hardware and software against the system specification. The combination of RTNI and BVT significantly reduces system validation time, risk and cost, while increasing the coverage and assurance level. These features can be implemented in processors that are very high performance, low power, commercial grade, or radiation- hardened. Application of this approach is underway in the development of processors for military and commercial applications.