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.
Get email delivery of the Cadence blog featured here
A couple of days ago I posted a puzzler on a scenario where fences couldn't be seen in Encounter. Check it out HERE.
Congratulations to Jason G for absolutely nailing it in the comments. He was indeed corrrect -- the issue was that the fences didn't contain any standard cells within them, so the tool wasn't displaying them. That's because the default setting stiplulates that module guides with less than 100 instances within them aren't displayed. This setting is controlled via the GUI under Options->Set Preference...->Display:
(Note: In 8.1 and earlier this form was accessed via Design->Preferences...)
This has been a long-standing default in the tool and it's usually a sensible one. If you think back to Encounter's legacy of being a high capacity floorplanning system with a unique virtual-flat view, it makes sense to think that modules will usually have standard cells beneath them and if there are less than 100 instances within a given module, it's usually not a large enough entity to consider as a partition. That being the case, the default is set to 100 in order to avoid the GUI from being cluttered up.
However, it's quite common for users to perform early floorplanning where there is no standard cell content to the modules. In cases like this, the tool can treat empty modules as black boxes, or as empty modules as was the case in the puzzler. That being the case, I'd be in favor of changing the default to 0 (i.e., all modules should be displayed regardless of how many standard cells are within them). What do you think? Let us know in the comments or by dropping me an E-mail: email@example.com
Setting that aside, why was it that one user was able to see the fences yet another wasn't? It was because one user had long ago set this preference and saved it in his home directory in an .enc file. If you'd like to save preferences for future sessions you can do so by clicking "Save" on the Preferences form and then choosing where you'd like to save the file. Next time you start the tool, it will pick up the preferences automatically:
For more information about EDI initialization files and the order in which they are sourced see this section of the EDI User's Guide.
So why doesn't the tool save the preferences when a design is saved? Well, it does, but depending on whether the design is restored or loaded from scratch, the preferences won't get restored. If one did a "saveDesign testcase.enc" that would result in a testcase.enc.dat directory. That testcase.enc.dat directory would contain the preferences saved in an enc.pref.tcl file. If that session was restored via Design->Restore Design... (or "source testcase.enc" which is equivalent to Design->RestoreDesign and the TCL command "restoreDesign") then the preferences associated with the database would be restored along with the design. But if the design is restored by loading a configuration file and floorplan file, then the preferences file doesn't get sourced.
In all, the moral of the story is that there is more information stored as a result of saveDesign than what is stored in the .conf file. You might consider passing around .enc.dat directories rather than .conf files when sharing data between users.
Further Reading: If you want to create a self-contained testcase this blog entry might be useful. It describes how to create a testcase that also contains all of the supporting library data which can be useful when passing databases to other sites that don't have visibility to the same file system. It's also very useful for passing testcases to Cadence applications engineers to troubleshoot issues. This is why "saveTestcase" is one of my favorite commands.
I hope this format is fun and useful. I'll post another puzzler soon.
Woo-Hoo! Bring on the harder puzzlers.