Ad Hoc design for testability technique

Question

Provide the reason why the Ad Hoc design for testability technique is more preferred in comparison to the other DFT techniques? Specify the major concepts that are used in the Ad Hoc DFT technique.

Answer 1

Ad Hoc design for testability technique is preferred in comparison to the other DFT techniques as they do not deal with the total design methodology which assures the ease of test generation, and they may be used at the designer’s option where applicable.

Ad Hoc DFT technique utilizes the following given concepts:

a) Test points

b) Initialization

c) Monostable multi-vibrators

d) Oscillators and clocks

e) Counter/shift registers

f) Partitioning large circuits

g) Logical redundancy

h) Breaking global feedback paths