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Multiprocessor systems-on-chip (MPSoC) pose a considerable validation challenge due to their size and complexity. We approach the problem of MPSoC validation through a tool that employs a reusable abstract executable specification written in C++. The tool effectively leverages a simulation-based, trace-driven mechanism. Traces are computed by simulating a system level register-transfer level (RTL) implementation of an MPSoC. The tool then analyzes the traces for correctness by checking them across executions of the abstract executable specification. We have effectively used the tool on various live MPSoC design projects based on the Power Architecture technology (The Power Architecture and Power.org wordmarks and the Power and Power.org logos and related marks are trademarks and service marks licensed by Power.org.). We demonstrate the effectiveness of the technique through results from these projects where we uncovered a number of design errors not found by any other technique.