A circuitry for error-correcting data and for checking a correctness of an error-correction capability of an error-correction component of the circuitry is provided. The circuitry includes an input interface for receiving an input data word. Moreover, the circuitry includes a data manipulator for manipulating one or more bits of a test data word to obtain a modified data word, wherein said test data word is said input data word or is derived from said input data word. Furthermore, the circuitry includes said error-correction component for processing the modified data word. Moreover, the circuitry includes an evaluation component for evaluating the correctness of the error-correction capability of the error-correction component depending on the processing of the modified data word by the error-correction component.
