editor's blog
Subscribe Now

Simpler CDC Exception Handling

For static timing analysis, it’s a concept that goes back years. You get a bunch of violations, and then you have to decide which ones represent false paths or multi-cycle paths and create “exceptions” for them. Tedious.

Well, apparently formal analysis can have the same issue. Only here they’re referred to as “waivers,” according to Real Intent. If you run analysis and get a long list of potential violations, you have to go through the list and, one by one, check them for “false positives” and mark them as such. Time-consuming and error-prone. And tedious. Especially when working on large-scale SoCs (so-called “giga-scale”).

In their latest release of Meridian CDC, which does clock-domain crossing verification, Real Intent has provided a different way of handling this: provide more granular control over the run parameters in the form of rules or constraints that can be successively refined.

Using the old method, if a particular over-reaching aspect of analysis caused 100 false positives, you’d have to find all 100 and “waive” them. With the new approach, when you find the first one, you make the refinement, and then, with a rerun of the analysis, the one you found and the other 99 all disappear. OK, not disappear per se, but they’re grouped together as not being an unexpected finding. You can also review that list to make sure nothing snuck through. (This is a simplification of a more sophisticated overall process, but it captures the essence.)

This may take some iterations, but in the end, you can have a clean run with no exceptions, and the way you got there is less likely to have involved a mistake here or there.

You can find out more about Real Intent’s latest Meridian CDC release in their announcement.

Leave a Reply

featured blogs
Mar 28, 2024
The difference between Olympic glory and missing out on the podium is often measured in mere fractions of a second, highlighting the pivotal role of timing in sports. But what's the chronometric secret to those photo finishes and record-breaking feats? In this comprehens...
Mar 26, 2024
Learn how GPU acceleration impacts digital chip design implementation, expanding beyond chip simulation to fulfill compute demands of the RTL-to-GDSII process.The post Can GPUs Accelerate Digital Design Implementation? appeared first on Chip Design....
Mar 21, 2024
The awesome thing about these machines is that you are limited only by your imagination, and I've got a GREAT imagination....

featured video

We are Altera. We are for the innovators.

Sponsored by Intel

Today we embark on an exciting journey as we transition to Altera, an Intel Company. In a world of endless opportunities and challenges, we are here to provide the flexibility needed by our ecosystem of customers and partners to pioneer and accelerate innovation. As we leap into the future, we are committed to providing easy-to-design and deploy leadership programmable solutions to innovators to unlock extraordinary possibilities for everyone on the planet.

To learn more about Altera visit: http://intel.com/altera

featured chalk talk

E-Mobility - Charging Stations & Wallboxes AC or DC Charging?
In this episode of Chalk Talk, Amelia Dalton and Andreas Nadler from Würth Elektronik investigate e-mobility charging stations and wallboxes. We take a closer look at the benefits, components, and functions of AC and DC wallboxes and charging stations. They also examine the role that DC link capacitors play in power conversion and how Würth Elektronik can help you create your next AC and DC wallbox or charging station design.
Jul 12, 2023
29,990 views