Integrated circuit with identification signal writing circuitry

Details Integrated circuit with identification signal writing circuitry Integrated circuit with identification signal writing circuitry

1995-11-17

1998-07-28

Trammell, James P.

Boots, shoes, and leggings

36446822, 36446823, 364491, 324 66, 324 67, 324763, 324764, G06F 1750, G01R 313177

Patent

active

057870128

ABSTRACT:
An integrated circuit includes a first metal layer with first layer identification signal writing circuitry connections to produce first metal layer circuit identification signals. The integrated circuit also has a second metal layer with second layer identification signal writing circuitry connections to produce second metal layer circuit identification signals. Logic circuitry in the first metal layer has input connections to the first layer identification signal writing circuitry connections and the second layer identification signal writing circuitry connections. The logic circuitry combines the first metal layer circuit identification signals and the second metal layer circuit identification signals to produce a circuit identification number. The value of the circuit identification number can be changed by altering the first layer identification signal writing circuitry connectors or the second layer identification signal writing circuitry connections. Thus, the value of the circuit identification number can be easily changed at the metal layer at which revisions are made.

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Martin et al. ("A CAD tool for circuit extraction from VLSI layout cells", IEEE, Southeastcon 1989 Proceedings on Energy and Information Technologies in the Southeast, 9-12 Apr. 1989, pp. 817-820).

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