Scan design and generic forms of scan designs

Question

Specify three generic forms of scan designs. Explain what is meant by the scan register?

Answer 1

Three generic forms of the scan designs are given as follows:

a) Full serial integrated scan

b) Isolated serial scan

c) Non-serial scan

Scan register is used to improve the Controllability/Observability. A scan register refers to the register having both the shift and parallel load capability. The storage cells within the register are used as observation points and/or control points.