In a dynamic random access memory device, refreshing each normal-retention row of storage cells once per refresh interval, refreshing each low-retention row of storage cells more than once per refresh interval and refreshing each high-retention row of storage cells that is associated with a low-retention...http://www.google.com/patents/US7565479?utm_source=gb-gplus-sharePatent US7565479 - Memory with refresh cycle donation to accommodate low-retention-storage rows
