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.
In my current design,some wires are quite long,look like over 3000ums,diriven by a buffer,fe does not report the net has transition violation.it should be a problem for the wires are so long.these pins/path are not constrained,could encounter fix this kind thing?if so,what should i do?
set_max_transition in sdc may solve this. If the transition on this net violates the max limit set, Ecounter sees this as violaton and may fix it during DRV FixNot sure :)
i am sure this is well set,and encounter does fix all the violations which are reported.i think take charge of the path constrained,but it should also handle the path which not constrained,especially for the transition time.3000+um should be a problem.or can anyone provide a way to fix these long wires?
You may face such problem if there is no timing path through this net.No timing path can come from a false_path, disable_timing_arc or constant propagation from SDC or tie connection coming from the netlist.The transition is calculate by the timer, and the consequence is that is there is no path, there is no transition, so no fix on your long wire.The trick you can use is to defined a default SDC, where you only put the set_load, set_input_transition ... constrains.Load only this new SDC and run optDesign -drv.Now the tools should be able to catsh your long net....Pat.
i checked the sdc, there is no set_load/set_input_transition for the input,and the report_timing -through [net_name] reports the input transition is 0.00. I think a 2000um(space 0.2um,width 0.2um) input net should be a transition violation based .13um process.by the way,the set_max_transition is 1.4ns.
Make a copy of your constraint file where all the set_case_analysis statements are commented out. Then do a reportTranViolation with that constraint file loaded. You can use report_cell_instance_timing to check a specific pin you are worried about.- Kari
You can try with the following variables: which will not consider set_false_path,set_desable_timing,set_case_analysis , exceptions for transition reporting and fixing , It basically propagates transition through constants .setvar dbgPropSlewForUnconstrainedPath 1 Let me know if this could solve your current Issue??Cheers.-Mohan
Kari, reportTansViolation could not report transition violation,but report_cell_instance_timing did report transition violations.if use timeDesign -postRoute, no tran vio,then use report_cell_instance_timing,no tran vio,neither.if only use report_cell_instance_timing,FE could report tran vios ( i mean spefIn ,then report_cell_instance_timing without any timeDesign or reportTransViolation)you know,if there are transition violations,report_cell_instance_timing could report it,but timeDesign could not report it,so how could i fix it?
Mohanit could report transition violations,for one or two,i could fix it manually,but for hundreds of (not that many),how could i fix it?also,if i spefIn,then timeDesign then reportTranViolation,FE could not report the vios.so the step worked is spefIn then reportTranViolation
Hi , Thought the Issues was regarding fixing transition on constant nets , But your Issue was some thing different.To address your Issue I need to know the back ground of your environment : like What you do is : (and let us know the values too) :1. you setAnalysis mode , ( was it set to -setup mode ??) 2. setExtract mode ( was it -signoff??) and also do the below at your end and le me know the results . Step-1 : spefIn Step-2: selectNet < net with 0ver 3000ums > Step-3: reportSelectmake a note of resistance and cap value on it.After doing timeDesign select the same net and do the above Step-1&2 , the whole intention is to know if some thing wrong at yhu end. in doing . Once you confirm I will let you know the fixing procedure !! , the mail thing is we need to make to understand that there is a transition violation , if its real .cheers,-Mohan
Mohan As you said, AnalysisMode is set to -checkType setup,and ExtractRCMode -engine signOff spefIn and selectNseet and reportSelect before and after timeDesign,R is the same. if i set ExtractRCMode -engine detail,and there is a transition violation. One thing i need to clarify is that for the current design,no "set_drive_cell" and "set_input_transition" and any constrains like this for the input pins.so what is the default? you know ,set_input_transition 0.6 is ok, but set 0.8 will cause transition violations. my think is for such a long wire,directly from input,there should be a problem,so how could encounter handle it?
Based on your reply to me (Kari), I still think it sounds like a constraint is masking the transition. You didn't say if you tried a constraint file with no set_case_analysis statments.- Kari
KariIn this design,no case_analysis was set,but no set_drive and set_input_transition was set,will this be a problem?what is the default?
if i remembered correctly, the default is 0.5ns. You can find this out by adding a set_input_transition to all the input pins with some numebr (try 0.5ns & 1.0ns) and then check the timing report (after timeDesign -postRoute)li siang
Check the following line in your .conf file:rda_Input(ui_in_tran_delay)This may be what is getting used for the default. It's a good idea to set the input trans in your sdc file.- Kari