Power Control in Integrated Circuits

An integrated circuit device comprising:

• a front-end-of-line portion;
• a back-end-of-line portion;
• and
• a plurality of power control units for controlling supply power to a plurality of power isles in the front-end-of-line portion, each power control unit of the plurality of power control units comprising:
• a power gating switch implemented in the back-end-of-line portion, wherein the power gating switch is configured to switch ON or OFF the supply power to a respective power isle of the plurality of power isles;
• a state recovery circuit configured to store and restore a state of the respective power isle, wherein the state recovery circuit comprises (i) at least one memory element implemented in the front-end-of-line portion or back-end-of-line portion and (ii) a transistor configuration in the back-end-of-line portion;
• and
• a wake-up/sleep circuit implemented in the back-end-of-line portion and configured to receive an identifier, wherein the wake-up/sleep circuit is operatively connected with the power gating switch and with the state recovery circuit, and wherein the wake-up/sleep circuit is configured to perform a wake-up/sleep process in response to receiving the identifier, the wake-up/sleep process comprising at least one of:
• (i) causing the power gating switch to switch OFF the supply power to the respective power isle and causing the state recovery circuit to store a state of the respective power isle, or
• (ii) causing the power gating switch to switch ON the supply power to the respective power isle and causing the state recovery circuit to restore the state of the respective power isle.