The application discloses an integrated circuit comprising: circuitry; a fusebox for storing an array of data identifying faulty elements within said circuitry; at least one fusebox controller for repairing said faulty elements in said circuitry in response to data received from said fusebox; a data communication path linking said fusebox controller with said fusebox; wherein said data stored in said fusebox is compacted data and said at least one fusebox controller comprises a data expander for expanding said compacted data received from said fusebox via said data communication path prior to repairing any faulty elements in said circuitry.