Generalized Parallel Signature Analyzers with External Exclusive-OR Gates

A new generalized parallel signature analyzer with external Exclusive-OR gates(GPSA-EE)ispresented.It allows the signature analyzer to have twice the number of inputs compared with an originalparallel signature analyzer.The equivalence between a GPSA-EE and an SSA-EE(serial signatureanalyzer)is established.Using the concept of multiple signatures,the error detection capability of signatureanalyzer can be enhanced by changing the connection between signature analyzer and circuit-under-test,or changing the characteristic polynomial p(x)of signature analyzer.