Method for online modification of compressed digital test vector

Details Method for online modification of compressed digital test vector Method for online modification of compressed digital test vector

1991-03-26

1993-09-07

Atkinson, Charles E.

Excavating

371 19, G01R 3128

Patent

active

052436039

ABSTRACT:
A method for online editing of compressed digital test vectors in an automated circuit test system, without requiring re-compilation of the test program source code. A method is provided for online editing of vectors compressed in both "indirect" and "keep/toggle (K/T)" compression formats. The test system environment within which the method operates comprises a computer and associated random access memory. The method can be summarized as follows: First, a new vector is created in random access memory (RAM) by storing a copy of the target vector to be modified. Next, pointers in RAM are adjusted to point to the new vector. Then, in order to compensate for K/T compression, the vector following the target vector must be examined to determine whether it requires modification, because of a "ripple effect" caused by modification to the previous vector. If the following vector requires modification, then a copy of the vector must also be created in RAM. Pointers in RAM are also adjusted to point to the copied following vector. Finally, the target vector is modified per user input, and the copied following vector, if created, is modified to compensate for the effect(s) of K/T compression.

REFERENCES:
patent: 4493045 (1985-01-01), Hughes, Jr.
patent: 4672307 (1987-06-01), Breuer et al.
patent: 4736375 (1988-04-01), Tannhauser et al.
patent: 5010552 (1991-04-01), Dias et al.

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