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Remember DFT? “Design For Test” faded into the background in recent years as the industry turned its focus to DFM, but if anything test is an even larger concern than it was 10 or 15 years ago. That’s because test is becoming more difficult and expensive at nanometer process nodes, especially with the drive for low-power design and the increasing prevalence of on-chip analog and mixed-signal circuitry.
A recent discussion with Sanjiv Taneja, vice president for Encounter Test at Cadence, showed me that the traditional way we’ve evaluated test costs is way too limited. Test cost is traditionally calculated in terms of capital costs and operating costs. Test engineers focus on optimizing throughput in order to minimize the amount of time each IC spends on the tester. One way that’s done is minimizing test data volume.
While minimizing time on the tester is still important, Sanjiv notes that there are additional criteria that must be considered to evaluate the true cost of test. These include:
All of the challenges listed above impact designers, and all can be alleviated through EDA tools. For example, power-aware automatic test pattern generation (ATPG) can make the right tradeoffs between test power reduction and test time reduction. DFT automation tools can hook up BIST engines to a chip test interface, and translate BIST set-up and run-time sequences to test interface ports. Advanced fault modeling and test-point insertion techniques can reduce the risk of escaped defects. And diagnostic EDA tools can speed yield ramps by figuring out the root causes of failures.
Cadence offers such capabilities in the Encounter Test product line, which is being shown at this week’s International Test Conference (ITC) in Austin, Texas. The ITC program, meanwhile, has a strong DFT emphasis. It includes a keynote and a plenary invited address that focus on the integration of design and test, as well as panel discussions on DFT for analog and low-power design. Cadence has representatives on both panels.
DFT has been around for a long time. I started writing about it in 1984 for Computer Design magazine, well before the term “EDA” was even invented. Here we are now, 25 years later, and it turns out that DFT is more important than ever. Some things never go out of style.
Good to see you blogging DFT - some of us have never forgotten DFT! Especially us DFT engineers - but the lack of coverage in the mainstream trade press, which has always been the case, as far as I'm concerned, is why I started blogging it.
ITC was good - although smaller, like all the other conferences seem to be. Lots of good stuff happening in test!