Cadence® system design and verification solutions, integrated under our Verification Suite, provide the simulation, acceleration, emulation, and management capabilities.
Verification Suite Related Products A-Z
Cadence® digital design and signoff solutions provide a fast path to design closure and better predictability, helping you meet your power, performance, and area (PPA) targets.
Full-Flow Digital Solution Related Products A-Z
Cadence® custom, analog, and RF design solutions can help you save time by automating many routine tasks, from block-level and mixed-signal simulation to routing and library characterization.
Overview Related Products A-Z
Driving efficiency and accuracy in advanced packaging, system planning, and multi-fabric interoperability, Cadence® package implementation products deliver the automation and accuracy.
Cadence® PCB design solutions enable shorter, more predictable design cycles with greater integration of component design and system-level simulation for a constraint-driven flow.
An open IP platform for you to customize your app-driven SoC design.
Comprehensive solutions and methodologies.
Helping you meet your broader business goals.
A global customer support infrastructure with around-the-clock help.
More Support Log In
24/7 Support - Cadence Online Support
Locate the latest software updates, service request, technical documentation, solutions and more in your personalized environment.
Cadence offers various software services for download. This page describes our offerings, including the Allegro FREE Physical Viewer.
The Cadence Academic Network helps build strong relationships between academia and industry, and promotes the proliferation of leading-edge technologies and methodologies at universities renowned for their engineering and design excellence.
Participate in CDNLive
A huge knowledge exchange platform for academia to network with industry. We are looking for academic speakers to talk about their research to the industry attendees at the Academic Track at CDNLive EMEA and Silicon Valley.
Come & Meet Us @ Events
A huge knowledge exchange platform for academia. We are looking for academic speakers to talk about their research to industry attendees.
Americas University Software Program
Join the 250+ qualified Americas member universities who have already incorporated Cadence EDA software into their classrooms and academic research projects.
EMEA University Software Program
In EMEA, Cadence works with EUROPRACTICE to ensure cost-effective availability of our extensive electronic design automation (EDA) tools for non-commercial activities.
Apply Now For Jobs
If you are a recent college graduate or a student looking for internship. Visit our exclusive job search page for interns and recent college graduate jobs.
Cadence is a Great Place to do great work
Learn more about our internship program and visit our careers page to do meaningful work and make a great impact.
Get the most out of your investment in Cadence technologies through a wide range of training offerings.
Overview All Courses Asia Pacific EMEANorth America
Instructor-led training [ILT] are live classes that are offered in our state-of-the-art classrooms at our worldwide training centers, at your site, or as a Virtual classroom.
Online Training is delivered over the web to let you proceed at your own pace, anytime and anywhere.
Exchange ideas, news, technical information, and best practices.
The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information.
It's not all about the technology. Here we exchange ideas on the Cadence Academic Network and other subjects of general interest.
Cadence is a leading provider of system design tools, software, IP, and services.
I have been using the scripts provided in the solution linked below for updating CDF parameters in cells and libraries with great success. However, I am often interested in checking if a cell does require a CDF update before actually performing the update, since the update requires "append" mode and is rather time consuming (especially when running on a large library). Is there any good way to utilize this script/other functionality to check if an instance in a cell requires a CDF-update without doing the actual update? It can be quite dangerous to run the script on a whole library with edit and not knowing which parameters that changed in the end.
My hack-around for this has so far been to dump all CDF parameters to a log file, run the script, dump the parameters again and do some parsing and comparison of these logs. I would however prefer something simpler.
There's nothing that really does this. Potentially you could use the functions in the code to run the callbacks on the "effective lookalike" CDF and then compare the results before applying them. In other words, you'd do something like:
cdf=cdfGetInstCDF(instId) effCDF=CCScreateEffectiveCDFLookalike(cdf t)CCSinvokeObjCdfCallbacks(effCDF) ; add other args as needed
then you can loop over the parameters of both the cdf and effCDF and see if there were any differences - this way it doesn't really apply any changes - just calls the callback in memory only. This approach will only work if you can get away with using this effective lookalike CDF; if you have CDF callbacks that do strict type checking on their arguments, it won't work.
Note the above is not from testing anything - it's from a quick look at the code (which was written by me, so I think it will work). I have used a similar trick in the past when building hierarchical pcells, where I needed to call the CDF callbacks within a pcell. For speed I wanted to call all the callbacks up front, and then apply all the derived parameters to the pcell instance, to avoid it re-evaluating the pcell for each combination that was found as it iterates through all the parameters.
In reply to Andrew Beckett:
This looks very promising, thanks a lot Andrew!
I compared the values of the parameters in cdf and effCDF and got many mismatches. I took a look inside CCScreateEffectiveCDFLookalike, and when setting the parameters, I see that they're set to their default value instead of their original value. This is done with:
; reset the value to defValue for safety (putpropq newParam (getq newParam defValue) value)
This explains the mismatches I got, since the parameters in cdf and effCDF had different values. As far as I can see, commenting out that line provides the functionality I want. However, why is the parameters set to their default values for safety?
In reply to skillprogramme:
The reason was that in the application that I added this for (creating an instance inside a hierarchical pcell, where I needed to call the callbacks), it was a fresh instance and so everything should have been at the default - and I was passing the cell CDF into the CCScreateEffectiveCDFLookalike function. Occasionally if called at the wrong time, the effective Cell CDF can end up with non-default parameters in (I forget the scenarios) and so I wanted to make sure it was reset. I then took the effective lookalike CDF that I was creating, and set the parameters I wanted to set for the child instance, and then called the callbacks on it.
If you're passing in the instance CDF, then you don't really want to reset everything. So maybe adding another argument to the function to not reset would make sense (or just comment out the code).
I'll add that to my list of things to do - to update the solution to the latest version, and to add this parameter.
I agree that an extra optional parameter is the best solution. I'll add it to the my version here for now. Could you also bump this thread when you update the online solution?
I have done some more testing now and your suggestion seems to do everything I want. Thanks a lot!
I've updated solution 11018344 to the latest version (it was almost the latest version - I just added this modification).
Thanks Andrew, this is doing exactly what I want to do!