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This paper describes our experience and methodology used in the model checking of S3C2400X industrial embedded SOC product. We employed model checking to verify the RTL implementation. We describe how to model the multiple clocks, gated clocks, unsynchronized clocks, and synchronization logics in model checking. Detailed case studies of real designs show the application of the proposed modeling techniques, environment modeling, and the properties we checked. The verification results validate the proposed techniques by finding real bugs.