Mg. Mcnamer et Ht. Nagle, ITA - AN ALGORITHM FOR I-DDQ TESTABILITY ANALYSIS, JOURNAL OF ELECTRONIC TESTING-THEORY AND APPLICATIONS, 8(3), 1996, pp. 287-298
This paper presents the I-DDQ Testability Analysis (ITA) algorithm for
the estimation of a circuit design's leakage fault testability. The a
lgorithm is based on the calculation of the probability of applying ea
ch of a set of ''essential vectors'' to each gate in the circuit. The
essential vectors for each gate represent the minimal vector set that
provides maximal leakage fault coverage.ITA assumes independence of ci
rcuit net values, except in the case of reconvergent fanout. Reconverg
ent fanout is identified by ''levelizing'' the circuit and propagating
sets of labels from the primary inputs forward through the circuit, b
eginning with unique labels (integers) on each primary input. ITA eval
uation of reconvergent fanout points then uses a backward implication
procedure to calculate the essential vector probability values for the
reconvergent gate, except in the case where backward implication is n
ot deterministic. Results of an implementation of ITA are presented fo
r a set of benchmark circuits, including a sample of the ISCAS '85 and
'89 circuits.