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Portable Stimulus has become quite the buzz-word in the verification community in the last year or two, but like most 'new' concepts it has evolved from some already established tools and methodologies. For example, having a common stimulus model between different levels of design abstraction has been possible for many years with graph-based stimulus automation tools like Questa® inFact. High-Level Synthesis (HLS), which synthesizes SystemC/C++ to RTL has also been available for many years with most users doing functional verification at the C-level using a mixture of home grown environments or directed C tests. With HLS now capable of doing very large hierarchical designs, however, there has been a growing need to have a verification
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