US Patent 7707021 Circuit emulation with state recovery

A circuit emulation system and method are provided, the system including at least one trace chain and a trace memory in signal communication with the at least one trace chain for sequentially receiving values and feeding them back through the chain to their original storage unit positions; and the method including modeling the circuit, providing at least one storage unit in the model, emulating the circuit with the model, extracting a state of the at least one storage unit during emulation, storing the extracted state, and restoring the stored state through a feedback loop.