In a programmable SoC (system-on-a-chip) integrated circuit device, a method for optimizing power efficiency for a requested device functionality. The method includes determining a requested device functionality, and in response to the requested device functionality, turning on power for a selected one or more power domains out of a plurality of power domains included within the integrated circuit device. Each of the power domains has its own respective voltage rail to obtain power. The method further includes turning on one or more power islands out of a plurality of power islands included within the integrated circuit device. The requested device functionality is then implemented using one or more functional blocks wherein each functional block is configured to provide a specific device functionality.

 
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