procedure for testing of berare forsedda with a number of digital integrated circuits, berare forsedd with these circuits.integrated circuit lempad for mounting on such a berare and apparatus for the testing of sada

摘要

A method of testing an interconnection function between two integrated circuits which are mounted on a carrier and which are interconnected by data connections, for example a printed wiring board, is disclosed. The integrated circuits are also connected to a serial bus via which test patterns and result patterns can be communicated between a test device which can be connected thereto and the respective integrated circuits. The bus of a preferred embodiment is formed by a so-called I2C bus. In a further elaboration, this set-up can also be used for testing the internal logic circuitry of the integrated circuits. For the testing of the interconnection function, input/output cells with a parallel connection for performing the normal execution function in a transparent mode are provided. They also include series connections for communication test/result patterns by way of a shift register.