1. A method, comprising: corrupting a main memory model for a memory in a power domain of a circuit design being emulated in an emulator, wherein the power domain is in a power-off state, the main memory model is a software model in a workstation coupled to the emulator, the memory is modeled by a combination of the main memory model and a cache memory model, and the cache memory model is a hardware model in the emulator, storing a subset of data that are stored in the main memory model and being synchronized with the main memory model; and invalidating the cache memory model.