Implementing enhanced array access time tracking with logic...

Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital logic testing

Reexamination Certificate

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C714S718000

Reexamination Certificate

active

07925950

ABSTRACT:
A method and circuit for implementing substantially perfect array access time tracking with Logic Built In Self Test (LBIST) diagnostics of dynamic memory array and random logic, and a design structure on which the subject circuit resides are provided. The dynamic memory array is initialized to a state for the longest read time for each bit and the dynamic memory array is forced into a read only mode. During LBIST diagnostics with the array in the read only mode, the array outputs are combined with the data inputs to provide random switching data on the array outputs to the random logic.

REFERENCES:
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patent: 7844869 (2010-11-01), Bushard et al.
patent: 2005/0097418 (2005-05-01), Anzou et al.
patent: 2006/0080584 (2006-04-01), Hartnett et al.
patent: 2006/0156090 (2006-07-01), Bushard et al.
patent: 2008/0077834 (2008-03-01), Khoche et al.
U.S. Appl. No. 12/015,254, filed Jan. 16, 2008 by Louis Bernard Bushard et al. and entitled “Method and Circuit for Implementing Enhanced LBIST Testing of Paths Including Arrays”.
U.S. Appl. No. 12/031,930, filed Feb. 15, 2008 by Donato O. Forlenza et al. and entitled “AC Scan Diagnostic Method and Apparatus Utilizing Functional Architecture Verification Patterns”.
U.S. Appl. No. 12/250,085, filed Oct. 14, 2008 by Donato Orazio Forlenza et al. and entitled “Implementing Diagnosis of Transitional Scan Chain Defects Using LBIST Test Patterns”.
U.S. Appl. No. 12/250,103, filed Oct. 2008 by Donato Orazio Forlenza et al. and entitled “Implementing Isolation of VLSI Scan Chain Defects Using ABIST Test Patterns”.

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