Cadence® system design and verification solutions, integrated under our System Development 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.
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 technlogy. 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 encountered some error in instantiate a cell into a top cell. When i tyring to get the cell view id by using function dbGetOpenCellViewByType(Lib Cell View "" "a") and it return me a warning message:
*WARNING*dbOpenCellViewByType: Unable to lock database file for Lib/Cell/View
when this warning happen, it will failed to execute other functions. Please advice.
Thanks a lot.
If you're instantiating a cellView in another view, there's no particular need to open the master in "append" mode. The master can just be in read mode (i.e. pass "r" instead of "a". What it is telling you is that it can't lock it - which will happen if:
If it fails to open in append mode (and can't lock it), dbOpenCellViewByType() will just return nil - and that's probably why further things went wrong.
In reply to Andrew Beckett:
Thanks for your fast reply. =D.
It means i have to check the cell before open it? I thought if i already open the cell view some where, dbOpenCellViewByType is still working rite? Because last time it use to be working fine.
In reply to kbhow:
I don't understand your question. If you just open it readonly, there'll be no problem. Unless there's some reason why you need to open it in "append" mode?
You should really always check the return value of dbOpenCellViewByType() to ensure that you managed to open whatever you're trying to open, whether in append or read mode.
Thanks for your reply. My attempt is to open the cell in "append" in nograph mode to perform some operation. This use to failed when dbOpenCellViewByType unable to open the cell and return nil. Do you mind providing me some idea how to handle this issue?
Where there is a need the cell view is already open by user, and another function is running in nograph mode.
Thanks in advance.
Well, quite simply, you cannot open the same cellView for edit in more than one session at the same time. This is to prevent data loss - otherwise you both would be editing the same data, and whoever saved last would win, and the work done in the other session would be lost.
Your options are:
That's really all I can think of - without understanding what you're actually trying to do, it's hard to advise further. Even then, this is a fundamental limitation (for very good reasons) of the tools, so you need to operate within those constraints.
Thanks a lot for your suggestion. I would like to go for option 1 and 2.