The following picture shows the model of the device with BILBO that will be used in our laboratory work. Three combinational circuits CC₁, CC₂, and CC₃ are given. The number of inputs of these circuits (a₁, a₂, a₃) may be different and not equal to each other. The same holds fot outputs (b₁, b₂, b₃). The circuits are tested with a single BILBO consisting of a random test pattern generator (TPG) and a signature analyzer (SA). Both the TPG and the SA are LFSRs. The TPG generates patterns of width A, where A is greater or equal to the biggest number of inputs among the three circuits. The SA has the length B that is also greater or equal to the biggest number of outputs of the circuits. For example, if a₂>=a₁ and a₂>=a₃, then A>=a₂. Similarly, if b₁>=b₂ and b₁>=b₃, then B>=b₁.

Last update: 6 September, 2002 by Artur Jutman