For decades we have used a model of faults in chips that assumes that a given signal is stuck-at-0 or stuck-at-1. And when I say decades, I mean it. The D-algorithm was invented at IBM in 1966, the year after Gordon Moore made a now very famous observation about the number of transistors on an integrated circuit. We know that stuck-at… Read More
The tech standards cycle almost always goes like this: Problems or limits develop with the existing way of doing things. Innovators attempt to engineer solutions, usually many of them. Chaos ensues when customers figure out nothing new works with anything else. Competitors sit down and agree on a specification where things work… Read More
On my first job out of college as an IC design engineer I was surprised to discover that a major cost of chips was in the amount of time spent on the tester before being shipped. That is still true today, so how would you keep your tester time down, test coverage high and with a minimum number of pins when using multiple processors on a single… Read More
At a lovely, but chilly, 3DIncites awards breakfast during SEMICON West, I saw Mentor Graphics win in two of five categories (Calibre 3DSTACK was the other winner). Afterwards, I talked to Steve Pateras, the product marketing director of Mentor’s test solutions about Tessent Memory BIST, which was one of the winners. I asked Pateras… Read More
Yesterday at SEMICON West I attended an interesting talk about how to use the masses of die test data to improve silicon yield. The speaker was Dr. Martin Keim, from Mentor Graphics.
First of all, he pointed out that with advanced process nodes (45nm, 32nm, and 28nm), and new technologies like FinFETs, we get design-sensitive defects.… Read More
SEMICON West is next week, July 9-11 in San Francisco. If you haven’t signed up, and want to attend for free instead of $100,
1) Send an email to silicon_test@mentor.com with subject line “Semicon pass.”
2) Register for SEMICON West
3) After registering, download the SEMICON West mobile app and start building your schedule. Here… Read More
Auto makers have historically been accused of things like planned obsolescence – redesigning parts to make repairs painfully or even prohibitively expensive – and the “warranty time-bomb”, where major systems seem to fail about a week after the warranty expires. Optimists would chalk both those up to relentless innovation,… Read More
You may have heard about cell-aware testing. It’s a transistor-level test (ATPG) methodology that is quickly becoming a hot topic. If you are involved in DFT and are looking for better quality and reliability, you should definitely know about cell-aware testing.
And lucky you, on May 16, 2013, you can attend a free seminar on cell-aware… Read More
Until now, the integration and testing of IP blocks used in large SOCs has been a manual, time consuming design effort. A new standard called IEEE P1687 (or “IJTAG”) for IP plug-and-play integration is emerging to simplify these tasks. EDA tools are also emerging to support the new standard. Last week mentor announcedTessent IJTAG,… Read More
The goal for automatic test pattern generation (ATPG) is to achieve maximum coverage with the fewest test patterns. This conflicts with the goals of managing power because during test, the IC is often operated beyond its normal functional modes to get the highest quality test results. When switching activity exceeds a device’s… Read More
