X-Alignment Techniques for Improving the Observability of Response Compactors Ozgur Sinanoglu Sobeeh Almukhaizim† Math & Computer Science Department Computer Engineering Department Kuwait University Kuwait University [email protected][email protected]2010 년 10 년 16 년 년년년 1
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X-Alignment Techniques for Improving the Observability of Response Compactors Ozgur Sinanoglu Sobeeh Almukhaizim† Math & Computer Science Department Computer.
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X-Alignment Techniques for Improving the Observ-
ability ofResponse Compactors
Ozgur Sinanoglu Sobeeh Almukhaizim†Math & Computer Science Department Computer Engineering Department
• A clear advantage of aligning x’s in both directions (regardless of the or-der) is that the observability level of the 2D-alignment is guaranteed to surpass, or be equal to, that when x’s are aligned in one direction only.
2D-alignment
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Response Shaper
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X-Alignment: Random Responses
Px : unknown probability
# of observable scan cells
ΔMAX = 1
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A, B : two industrial circuits(provided by Cadence)80X196 : 80 scan chains with a scan depth of 196
# of observable scan cells
ΔMAX = 1
X-Alignment: Industrial Responses
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COST COMPARISONS ON ISCAS89 CIR-CUITS
TDV : Test data volume of the base case includes those of uncompressed stimuli and uncompacted responses.
The reported area costs for x-align and response shaper do not include the cost of the XOR tree.