editor's blog
Subscribe Now

Working Forward

You may recall that Vennsa’s OnPoint tool takes the results of verification and helps identify errors and possible causes. The tool’s early focus was on identifying suspect issues and letting you work from there.

Last year around DAC time, we noted that they took things a step further to suggest possible fixes (but you had to confirm whether they truly were fixes) and to do a better job of triage, clumping together things that might have a common cause.

But this is all reflected the backwards tracing that is typical of debug: find an issue and work back to possible causes. This is as opposed to forward debug, which, in its worst manifestation, consists of guessing at places to make changes and following the changes forward to see if they fix things. Couched in those terms, the forward approach sounds more like an act of desperation.

This year they have improved their “causality engine” to the point where you can start with proposed fixes and see the chain of logic from each proposed fix to the now-corrected problem point that demonstrates that the fix works. You can work forwards, except that now the specific locations of fixes and the values that fix them are provided by OnPoint rather than by a wish and a prayer.

It’s important to note that the “fixes” proposed aren’t circuit fixes; they’re just logic values (and times, in the case of state machines and such) that will remove the offending behavior. You still need to come up with a circuit change to implement the fix and then simulate it to ensure that you haven’t created a problem for yourself anywhere else.

One of the benefits of this is that the verification folks can now save the design folks lots of debug time. Before, a block might get handed back to a designers saying, “There’s a problem; here’s the test that failed.” Now that information can be accompanied by, “And here are a series of solutions from which you can choose.” Makes for much friendlier interactions.

You can find out more in their release.

 

Leave a Reply

featured blogs
Jan 22, 2021
Amidst an ongoing worldwide pandemic, Samtec continues to connect with our communities. As a digital technology company, we understand the challenges and how uncertain times have been for everyone. In early 2020, Samtec Cares suspended its normal grant cycle and concentrated ...
Jan 22, 2021
I was recently introduced to the concept of a tray that quickly and easily attaches to your car'€™s steering wheel (not while you are driving, of course). What a good idea!...
Jan 22, 2021
This is my second post about this year's CES. The first was Consumer Electronics Show 2021: GM, Intel . AMD The second day of CES opened with Lisa Su, AMD's CEO, presenting. AMD announced new... [[ Click on the title to access the full blog on the Cadence Community...
Jan 20, 2021
Explore how EDA tools & proven IP accelerate the automotive design process and ensure compliance with Automotive Safety Integrity Levels & ISO requirements. The post How EDA Tools and IP Support Automotive Functional Safety Compliance appeared first on From Silicon...

featured paper

Common Design Pitfalls When Designing With Hall 2D Sensors And How To Avoid Them

Sponsored by Texas Instruments

This article discusses three widespread application issues in industrial and automotive end equipment – rotary encoding, in-plane magnetic sensing, and safety-critical – that can be solved more efficiently using devices with new features and higher performance. We will discuss in which end products these applications can be found and also provide a comparison with our traditional digital Hall-effect sensors showing how the new releases complement our existing portfolio.

Click here to download the whitepaper

Featured Chalk Talk

Mindi Analog Simulator

Sponsored by Mouser Electronics and Microchip

It’s easy to go wrong in the analog portion of your design, particularly if you’re not an analog “expert.” Electrical simulation can help reduce risk and design re-spins. In this episode of Chalk Talk, Amelia Dalton chats with Rico Brooks of Microchip about the MPLAB Mindi tool, and how it can help reduce your design risk.

Click here for more information about MINDI Analog Simulator.