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 use defstruct to define a struct variable. For example:
defstruct(mystruct aaa bbb)
s1 = make_mystruct(?aaa 1 ?bbb 2)
then I use setVarWriteProtect to make s1 write protected:
But when I change s1->aaa = 5, it still can be modified. Seems only s1 is write protected, but no its member variables.
How to write protect the member variable s1->aaa? Is there anyway to do it in Skill if not by function setVarWriteProtect?
In reply to Angeila:
We're not ignoring you. It's just that we don't know the answer or if it is possible. I think it might be a question for a Cadence person.
Why do you want to protect it like this? I can't really think of a good reason.
In reply to eDave:
Thanks for your kindly response:)
I created a structure which will be shared by other team members after I initialize it, and it will be surved as read-only purpose as I don't want it to be changed by other team members by accident.
I am a greenhand to Skill language, when I refer to skill user guide, I found setVarWriteProtect can meet such requirement, but it does not work a defstruct variable.
Could you please share me any feasible way to do so?
Generally variables should be set to be local by including them in a let statement. Local variables cannot be changed by users.
You may have to re-think your code if you want to protect the contents of a global variable. The documentation states that the behavior of this is not specified.
eDaveGenerally variables should be set to be local by including them in a let statement. Local variables cannot be changed by users.You may have to re-think your code if you want to protect the contents of a global variable. The documentation states that the behavior of this is not specified.
Thanks! Actually that is not a global variable, it(the defstruct variable) is passed as a function parameter. it might be Skill limitation to write protect a defstruct variable. Not sure...
Anyway, I will think about other way to protect it.
Another interesting phenomena I found is that a local variable defined in parent function is visible in its child function.
Please look at following example, cellName is visible in function testCell(), it can be printed out as "abc" when call function mytest().
It behaves differently compared with that of C language, and other script language, like Tcl. Is there any special purpose for SKILL to do so?
procedure( mytest() prog( (cellName) cellName = "abc" testCell() ))procedure( testCell() prog( () printf("cell name is %s ...\n" cellName) ))
Yes, I had noticed that behaviour - sometimes it's useful, but I think it's bad practice use it deliberately.
I use defstruct to define a variable
defstruct(var1 label msg)
If I Recall The Function Its Giving Warning
*WARNING* defstruct: Redefining Structure var1.
can u help me how to resolve.
In reply to Bala Venkata Naga Durga Prasad Soutani:
boundp isn't working .
I will give u a simple example script
Input File (test.txt):
M2 width=0.34um length=0.5umM3 width=0.34um length=0.5um
procedure(mytest(fileName) prog( () inFile = infile(fileName) defstruct(struct width length) ; giving warning here setq(tabel (makeTable 'layers 0)) while(gets(line inFile) lineInList = parseString(line " \n") tabel[nth(0 lineInList)] = make_struct(?width nth(1 parseString(nth(1 lineInList) "=")) ?length nth(1 parseString(nth(2 lineInList) "="))) ) ) )mytest("./test.txt")
= So where I need to check.
Try the code below. Also note that defstruct names are global so you should always prefix them to avoid collisions with other skill code.
unless( boundp('mystruct ) defstruct(mystruct width length))procedure(mytest(fileName) prog( () inFile = infile(fileName) setq(tabel (makeTable 'layers 0)) while(gets(line inFile) lineInList = parseString(line " \n") tabel[nth(0 lineInList)] = make_mystruct(?width nth(1 parseString(nth(1 lineInList) "=")) ?length nth(1 parseString(nth(2 lineInList) "="))) )))mytest("./test.txt")
In reply to fxffxf:
Thanks eDave Now it is working ,
can you me in solving another,
Why defstruct giving error when i use like this
defstruct(stringToSymbol("test_structure") a b c)
First argument to the defstruct is symbol and i am also giving the same.
Is there any other to do like this.