Patent ID: 6654920
Filing Date: 2003-11-25
Classification: G01R

Abstract:
An integrated circuit, comprising:combinational circuitry; a plurality of scan channels; wherein each of the plurality of scan channels comprises a number of scan elements; wherein for any of the plurality of scan channels having a number of scan elements greater than one element, the scan channel comprises a first element in the scan channel and a last element in the scan channel; wherein for any of the plurality of scan channels having a number of scan elements equal to one element, the one element is both a first element and a last element in the scan channel; and wherein selected ones of the scan elements are coupled to affect operation of the combinational circuitry; circuitry for coupling a predetermined pattern into the first element of each of the plurality of scan channels; and circuitry for determining, in response to circuitry for detecting, the number of scan elements in a longest of the plurality of scan channels.