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 noticed that in my SP simulations the following warning occurs when a DC operating point simulation doesn't precede it:
WARNING (CMI-2015): Unable to open nodeset file `spectre.dc'. No such file or directory.
Could someone please clarify what the function of the spectre.dc file in performing a SP simulation? Also, why is this a warning instead of an error?
Thanks for the help.
Most likely you have the readns parameter on one of the analyses (for example the sp analysis) set to "spectre.dc". This tells whichever analysis it is to try to read the nodeset file as a hint for the DC algorithm that precedes the analysis (pretty much every analysis requires a DC operating point to start from, including an S-parameter analysis). If the file is missing, it will solve the DC operating point as usual - the file is just a hint.
The reason why it's not an error is that quite often you do things like this:
dc dc readns="spectre.dc" write="spectre.dc"
Which means the first time it will give you a warning, then write the DC operating point at the end of the simulation. The second run, the file will exist, and it will use that as a starting point. We try to make it not too critical if the file doesn't exist - since it is a hint.
If you really want it to error out, you can do that by adding this option into your netlist:
increaseSeverity options warning_change_severity=error warning_id=[CMI-2015]
And then it will fail:
Error found by spectre during DC solution estimation, during DC analysis `dc'. ERROR (CMI-2015): Unable to open nodeset file `spectre.dc'. No such file or directory.
In reply to Andrew Beckett: