System and method for enabling a vendor mode on an integrated circuit

摘要

A system and method for enabling a vendor mode on an integrated circuit. A method is disclosed for applying a potential to a no-connect pin, whose function is unknown to the customer, to prevent the accidental enabling of the vendor mode. Applying the potential to the no-connect pin while concurrently applying a distinct sequence of logic values to other pins signals the deliberate intention to activate the vendor mode.