High observability testing environment allows internal circuit nodes to be used as test points. However, such flexibility requires the development of new ATPG algorithm. Previous reported algorithm does not guarantee full fault-coverage and assumes all internal circuit nodes are test points. The new algorithm described in this paper will generate a full fault-coverage test set for a fanout free combinational circuit. The main characteristic of the algorithm is that it generates test vectors as well as probe points. As a result, the probe points are different for each test vector, and the number of probe points is the minimum for test set generated. Results obtained show that an average of 30% test vector reduction is achieved compared with the conventional test method which uses only output pins as test points.

A multichannel local area network protocol is presented. It uses a token ring with partial register insertion as a control channel for a number of data channels. In addition to the control functions, the control channel is also used for transmission of data. The protocols allows performance comparable to an equivalent multiple-ring network. Its main advantage is simpler hardware requirements. The protocol is deterministic and suitable for real-time applications.>