Patent ID: 8020017

Claim:
A circuit comprising: a first power domain, the first power domain including a first set at least one terminal, the first set of at least one terminal configured for providing signals; a second power domain, the second power domain including a second set of at least one terminal, the second set configured for receiving signals, the first power domain is power gatable with respect to the second power domain; a controller circuit, the controller circuit having a third set of at least one terminal for providing programmable values; and isolation circuitry having an input coupled to the first set of at least one terminal, a second input coupled to the third set of at least one terminal, and an output coupled to the second set of at least one terminal, the isolation circuitry including an input to receive an isolate signal, wherein the isolation circuit couples the first set of at least one terminal to the second set of at least one terminal to receive signals based on the isolation signal being in a first state and couples the third set of at least one terminal to the second set of at least one terminal to receive signals based on the isolation signal being at a second state.