Single-output embedded checkers for systematic unordered codes

Berger codes are common systematic codes for detecting unidirectional errors. We present checker architectures for Berger-type codes that are similar to Berger codes. We also describe new checker architectures for Bose AUED codes and Biswas-Sengupta AUED codes. The design of these checkers is based on translating the code words to words of a Berger-type code which are then checked by a Berger-type code checker The translation circuits are very simple. All checkers can be tested with only a few code words, or achieve the self-testing property almost independent of the provided set of code words, and are therefore very suitable as embedded checkers. Also, all checkers are designed to have only one periodic output. Further our checkers are not code-disjoint in the common sense but able to detect all single and multiple unidirectional errors.