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Over the last decade functional verification of ASIC systems has witnessed a paradigm shift in verification methodologies. Until late 90's a verification project requirements were met by traditional test-benches written using a HDL(hardware description language, used for coding the design) or a software language like C. These test environments supported directed testing by generating a pre-calculated stream of input data only focusing on the desired coverage points in the design.As the design size and complexity grew exponentially, with a million gate design becoming the norm, clearly the directed verification approach is quite cumbersome.

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