A Non-Scan Testable Design of Sequential Circuits by Improving Controllability

As a method for testing a sequential circuit efficiently, a scan design is usually used. But, since this design has some drawbacks, a non-scan testable design should be discussed. The testable design can be implemented by enhancing controllability and observability. This paper discusses a non-scan testable design for a sequential circuit by only focusing the improvement of controllability. The proposed design modifies a circuit so that all the FFs can be directly controlled by primary input lines in a test mode. Experimental results show that we can get a good testability using this method.

A Non-scan DFT Method at RTL Based on Fixed-control Testability to Achieve 100%Fault Efficiency

This paper proposes a non-scan design-for-testability method for register-transfer level circuits where a circuit consists of a controller and a data path. It achieves complete fault efficiency with low hardware overhead and at-speed testing.