Integrated circuit test mode securisation

摘要

The circuit has a logic circuit (2), and storage cells (3) connected to the circuit (2). A connection control module (4) connects the cells, according to a predetermined order, to form a test circuit, when the module`s input (41) receives a valid identification key and the cells receive a test reading or writing control signal. The module connects the cells to form a diversion circuit when the input does not receive the key. An independent claim is also included for a chip card including an electronic circuit.