Patent ID: 7774662
Filing Date: 2010-08-10
Classification: G01R

Abstract:
1. An electronic circuit, comprising: at least one scan chain of latches, for providing a test stimuli pattern to an associated combinatorial logic circuit; and a mechanism to allow a data flow in said scan chain to be reversed in direction so that a critical stimuli pattern can selectively be restored and thereby repeated by at least a portion of said at least one scan chain, wherein each said latch comprises a master flipflop and a slave flipflop and said mechanism to reverse data flow comprises a multiplexer interconnected between said master flipflop and said slave flipflop, and wherein said multiplexer between said master flipflop and said slave flipflop is interconnected such that said slave flipflop receives, as based on a control signal to said multiplexer, an input signal from a selected one of: