Time Redundant Fault-Location in Bit-Sliced ALU's

A method of fault location in arithmetic and logic units (ALU's) is proposed. When the failures are confined to adjacent bit slices of the ALU's, the RESO (recomputing with shifted operands) based method can isolate the faulty bit slices by specifying a larger set of ``suspicious'' faulty bit slices, and, therefore, identify the definitely fault-free bit slices in ALU's. The method is applicable to both arithmetic and logic operations.