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Method and apparatus for enhancing security in and discouraging theft of VLSI and ULSI devices

  • US 5,774,545 A
  • Filed: 03/28/1996
  • Issued: 06/30/1998
  • Est. Priority Date: 03/28/1996
  • Status: Expired due to Term
First Claim
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1. A large scale integrated device having a core functional circuit and at least one output port, said device comprising:

  • a security mechanism;

    a controller to control the operation of the security mechanism;

    a boundary scan port electrically coupled to said controller, said boundary scan port providing an interface between the security mechanism and an external medium;

    a flash memory electrically coupled to said controller, said flash memory providing the security mechanism with non-volatile storage of predetermined information and data;

    a set of security registers for providing functional support to said controller, said security registers electrically coupled to said flash memory, said controller and said boundary scan port; and

    tristate control logic for providing said controller with functional control over the core functional circuit and the output ports of the large scale integrated device, said tristate logic control electrically coupled to said controller, the core functional circuit and output ports of the device.

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