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System for reducing peak power during scan shift at the global level for scan based tests

  • US 9,377,510 B2
  • Filed: 12/28/2012
  • Issued: 06/28/2016
  • Est. Priority Date: 12/28/2012
  • Status: Active Grant
First Claim
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1. A method for testing an integrated circuit, said method comprising:

  • multiplexing a test clock with a functional clock on said integrated circuit at a root of a clock tree to produce a second clock signal;

    dividing the second clock signal into multiple branches, wherein each branch is operable to be delayed by a plurality of delay elements, and wherein each branch is delayed by a different number of delay elements of the plurality of delay elements to produce a plurality of lines with variable delay;

    routing each line of said plurality of lines with variable delay to a respective plurality of cores and a cache on said integrated circuit, wherein each of the plurality of cores and the cache is operable to be subdivided into a plurality of partitions; and

    staggering a third clock signal received by each of the plurality of cores and the cache during a scan shift cycle, wherein the third clock signal is derived from the second clock signal and routed using a respective line of said plurality of lines.

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