Reduction of the Target Fault List and Fault Simulation Method for Crosstalk Faults in Clock-Delayed Domino Circuits

Takanori SHIRAI
Noriyoshi ITAZAKI

IEICE TRANSACTIONS on Information and Systems   Vol.E85-D    No.10    pp.1526-1533
Publication Date: 2002/10/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on Test and Verification of VLSI)
Category: Test and Diagnosis for Timing Faults
domino circuit,  crosstalk fault,  target fault reduction,  fault simulation,  

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In recent years, the domino logic has received much attention as a design technique of high-speed circuits. However, in the case of standard domino logic, only non-inverting functions are allowed. Then, the clock-delayed (CD) domino logic that provides any logic function is proposed in order to overcome such domino's drawback. In addition, domino circuits are more sensitive to circuit noise compared with static CMOS circuits. In particular, crosstalk causes critical problems. Therefore, we focus our attention on crosstalk faults in CD domino circuits. However, in CD domino circuits, there are faults that don't propagate faulty values to any primary output even though crosstalk pulses are generated. Then, we remove such faults from the target fault list by considering structures of CD domino circuits, and perform a fault simulation for the reduced target fault list using two kinds of fault simulation method together. We realize CD domino circuits in VHDL and perform the proposed fault simulation for the combinational part of some benchmark circuits of ISCAS'89 on a VHDL simulator. Fault coverage for random vectors was obtained for s27 to s1494 under the limitation of simulation time.