Patent ID: 9618578
Date: 2017-04-11
CPC Classifications: G01R,G11C

Claim:
1. A method for performing scan testing using a scan chain having a plurality of storage elements, the method comprising: during a capture phase, each storage element of the scan chain storing data from a first data input of the storage element synchronously with a clock signal; and during a shift phase, shifting a scan pattern into the scan chain in which each storage element stores data from a second data input of the storage element asynchronously with the clock signal, the shifting the scan pattern into the scan chain comprises providing a first data bit of the scan pattern to a second data input of a first storage element of the scan chain, and asserting a request signal a first time at a request input of a last storage element of the scan chain, wherein the request signal initiates storage of a data value at the second data input of the last storage element into the last storage element.