Patent ID: 7921342

Claim:
An electronic circuit comprising: a plurality of logic cells; a plurality of configurable cells being functionally linked to said plurality of logic cells for forming at least one logic circuit if a chaining command signal is in a first state; and an interconnection circuit comprising a plurality of connection cells being functionally linked to said plurality of configurable cells if the chaining command signal is in a second state, each connection cell comprising a first data input connected to a data output of one of said plurality of configurable cells, a data output connected to a test input of another one of said plurality of configurable cells having a rank higher than a rank of the configurable cell connected to the first data input, a second data input connected to the data output of the other configurable cell, and a combination and connection circuit for performing the following functions if the chaining command signal is in the second state combining the first and second data inputs, and applying a result of the combining to the data output if an authentication signal is in a first state, or connecting the first data input to the data output if the authentication signal is in the second state.