Q-gating cell architecture to satiate the launch-off-shift (LOS) testing and an algorithm to identify best Q-gating candidates

摘要

A method for creating an architecture to support Q-gating for launch-off-shift (LOS) scan testing using a plurality of flip-flops is provided. The method may include applying a common clock signal to each clock input of the plurality of flip-flops and applying a gated scan enable signal to each scan enable input of the plurality of flip-flops. The method may further include applying a global scan enable signal directly to each of a plurality of Q-gates corresponding to each of the plurality of flip-flops, wherein the global scan enable signal traverses a signal path that bypasses combinational logic located between any two flip-flops of the plurality of flip-flops.

主权项

1. A method for creating an architecture to support Q-gating for launch-off-shift (LOS) scan testing using a plurality of flip-flops, the method comprising:
applying a common clock signal to each clock input of the plurality of flip-flops; applying a gated scan enable signal to each scan enable input of the plurality of flip-flops; and applying a global scan enable signal directly to each of a plurality of Q-gates corresponding to each of the plurality of flip-flops, wherein the global scan enable signal traverses a signal path that bypasses combinational logic located between any two flip-flops of the plurality of flip-flops.