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Archive for May 2nd, 2011

The Journey to CDC Sign-Off

Monday, May 2nd, 2011

On Thursday May 5th, Real Intent and SpringSoft will co-host a seminar addressing “Latest advances in System-on-chip functional verification sign-off”.  One of the topics is, “You are doing CDC verification, but have you achieved CDC sign-off?”, where I will be discussing the history of CDC verification, why it is important to focus on CDC sign-off today, and most importantly, how to achieve CDC sign-off.

Real Intent, as a leader in the space of CDC verification and sign-off, has made great contributions to the field by advancing the technology, as well as in educating the industry on key CDC issues. The Real Talk Blog, over the past year, has featured many articles discussing aspects of CDC verification and sign-off. A few highlights are included here:

CDC (Clock Domain Crossing) Analysis – Is this a misnomer?

Al Joseph, Sr. Application Engineer, wrote about the fact that while the industry was quick to adopt the acronym “CDC”, and many EDA vendors were quick to claim to have a CDC solution, users need to understand what CDC analysis really entails. A Real CDC solution must go far beyond just checking for single-bit and data-bus metastability management. It should also recognize and verify all asynchronous interfaces, support RTL and gate-level netlists, and incorporate structural, formal, and metastability simulation techniques.

Clock Domain Verification Challenges: How Real Intent Is Solving Them

Real Intent CTO, Dr. Pranav Ashar, discussed the mounting challenges facing clock domain crossing verification today, such as the number of signal crossings between asynchronous clock domains, the proliferation of gated clocks, widely disparate and dynamic clock frequencies, reset distribution, timing optimization, etc.  Dr. Ashar also touched upon how Real Intent’s solution addresses these challenges.

Verifying CDC Issues in the Presence of Clocks with Dynamically Changing Frequencies

Vishnu Vimjam, R&D Manager, discussed a unique capability Meridian CDC has in verifying designs with dynamically changing frequencies.  With other solutions, users would have to perform multiple runs to verify the correctness of the design under different frequencies combinations. Using Meridian CDC, however, users can obtain confidence in one run on whether there will be CDC design errors under all possible frequencies. This is the most advanced technique in formal CDC analysis, not a small achievement for Meridian CDC R&D.

What Do You Need to Know for Effective CDC Analysis?

People often underestimate the knowledge required to make the best use of a CDC tool. Sr. Application Engineer Al Joseph outlined all the things a design or verification engineer needs to understand, such as power, testability, quasi-static domains, and mode selection, etc., in order to be the most productive and effective in using a CDC solution.

Is Your CDC Tool of Sign-Off Quality?

With the increase of design size and number of asynchronous clock domains (we have worked with companies with well over 100M gates with 200 asynchronous clock domains), CDC sign-off has become a must-have in the verification sign-off flow. However, not every CDC solution is up to the task of CDC sign-off. Al Joseph, Sr. Application Engineer, wrote about the criteria a CDC tool needs to have in order to enable CDC sign-off.

Top 3 Reasons Why Designers Switch to Meridian CDC from Real Intent

Rick Eram, Director of Sales at Real Intent, has first-hand knowledge of why designers are switching to Meridian CDC after trying out competitors’ products. In short, the main reasons are ease-of-setup, accuracy, performance and coverage. To sum it up, “Doing CDC verification takes a Real CDC tool architected to do the job, not a linter adapted to do CDC work”.

Real Intent has a wealth of knowledge and experience in CDC verification and sign-off. It is our mission to help every design and verification team succeed in achieving CDC sign-off. Come and join us for an informative and fun seminar on May 5th at noon! You can sign up at

I look forward to seeing you there!



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