STATE RETENTION POWER GATED CELL FOR INTEGRATED CIRCUIT

摘要

A state retention power gated (SRPG) cell includes a retention circuit coupled to a power gated circuit. The retention circuit stores state information of the power gated circuit before a low power period is started. A gated power supply coupled to the power gated circuit and to a first end of a power supply switch supplies a gated supply voltage to the power gated circuit during a non-low power period. A local power supply coupled to the retention circuit and to a second end of the power supply switch is coupled to the gated power supply in the non-low power period, and a non-gated power supply is coupled to the local power supply via an isolation element to isolate the non-gated power supply from the local power supply during the non-low power period, and to couple the non-gated power supply to the local power supply during the low power period.

主权项

1. An integrated circuit, comprising:
a power gated circuit (202) that is shut down during a low power period; a retention circuit (204) coupled to the power gated circuit (202) during at least a portion of the non-low power period, wherein the retention circuit (204) stores, during the low power period, state information reflecting a state of the power gated circuit (202) before the low power period started; a gated power supply (206) coupled to the power gated circuit (202) and to a first end of a power supply switch (210) for supplying a gated supply voltage to the power gated circuit (202) during a non-low power period; a local power supply (214) coupled to the retention circuit (204) and to a second end of the power supply switch (210), wherein during the non-low power period the local power supply (214) is coupled to the gated power supply (206) via the switch (210); and a non-gated power supply (208) coupled to the local power supply (214) via an isolation element (212); wherein the isolation element (212) isolates the non-gated power supply (208) from the local power supply (214) during the non-low power period, and couples the non-gated power supply (208) to the local power supply (214) during the low power period.