Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-01-08
1992-03-31
Hudspeth, David
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
2353825, 34082531, H04Q 100
Patent
active
051011212
ABSTRACT:
The disclosure relates to integrated circuits and, more particularly, to circuits that use electronic locks to modify the configuration of the circuit, for example to restrict access by the user to certain functions or certain pieces of data of the circuit. There is provision for a first electronic lock capable of being locked or unlocked during a stage for the testing of the integrated circuit and capable of being irreversibly locked after the end of the testing stage, and for a second electronic lock capable of being unlocked only so long as the first lock is unlocked. In this way, the entire circuit can be tested in the form in which it is presented to the user, the locking of the locks being, so to speak, simulated during the test.
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Hudspeth David
SGS - Thomson Microelectronics S.A.
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