Patent ID: 9710035
Date: 2017-07-18
CPC Classifications: G06F

Claim:
1. An IC chip, comprising: at least two power supply domains; an isolator configured to have a bridge function and a trace function; wherein (a) the bridge function passes a signal on a bus in one of the two power supply domains to a bus in the other of the two power supply domains when turning on power supply in both of the two power supply domains; and (b) the two power supply domains are a first power supply domain and a second power supply domain, and the trace function traces actions of a circuit in the second power supply domain when turning off power supply in the first power supply domain and turning on power supply in the second power supply domain; and a main processor in the first power supply domain; wherein the main processor communicates with an external debug device when turning on power supply in both of the first and the second power supply domains, and the isolator communicates with the external debug device when turning off power supply in the first power supply domain and turning on power supply in the second power supply domain.