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.
When I try to run a Spectre dc and trans simulation with my 8-bit-adder circuit, have an internal error stopping the simulation. I get the following messages in the spectre log window:
1) the usual "unable to compile ahdlcmi module library" message (which has not stopped my simulations in the past),
2) a warning from spectre during initial setup about having PMOS and NMOS from the driver circuit running at 1 A/exceeding imelt = 10 mA (the test driver/load circuit provided by our course instructor)
3) "Internal error found in spectre during topology check, during initial setup." --> "Assertion failed in file 'topology.c' at line 1008"
Any ideas how to interpret error #3?? I've done the Virtuoso save and check with no error for the 8-bit-adder or any of the lower schematics in the hierarchy.
To explain how I'm implementing an 8-bit-adder: The design is four 2-bit-adders linked together. Each 2-bit-adder is made of 2 individual adders. Individual adders have Carry Out implemented with CMOS and Sum implemented with pass-logic transistor gates.
Thank you for your time.
In reply to Andrew Beckett:
Spectre 5.1.41 USR1 it says.
In reply to CPete:
You're using a version of spectre built 6.5 years ago. That doesn't make sense, given that there have been 7 major releases of the analog simulators since then. In 2004 we split off the simulators from the IC stream, and have released MMSIM60, MMSIM61, MMSIM62, MMSIM70, MMSIM71, MMSIM72 and most recently MMSIM101. The version of spectre in the IC5141 has not been maintained for some time (although since you're using USR1 which is from December 2004, that's irrelevant).
I would suggest you try installing a recent MMSIM version; I would expect the problem to go away as there have been many advances in the last 7 years.
Much agreed. However, this version is provided by our university, who I imagine have no incentive to update unfortunately.
I did solve my internal failure issue by taking my wires which were previously sharing common names, but not connected, and hard-wired them together in the schematic. I'm sure the circuit logic is correct, but somehow the provided driver circuit and my adder circuit were not simulating well together. Thanks again for the help.
I can't really see how that would help, since presumably the resulting netlist would be the same - spectre has no visibility of the schematic. I can only assume that something subtle changed which allowed it to proceed.
Most universities would be using more recent versions than that - even if the IC version is old. But I agree, things may be more constrained there.
I am using -- Setup Cadence IC 6.1.5_HF132
And I am getting the following errors -
Internal error found in spectre during check, during IC analysis, during periodic steady state analysis `pss'. Please run `getSpectreFiles' or send the netlist, the spectre log file, the behavioral model files, and any other information that can help identify the problem to email@example.com. FATAL (CMI-2010): Assertion failed in file `check.cc' at line 518. FATAL (SPECTRE-21): Assertion failed.
In reply to Conhas Thakkar:
Given that the assertion is coming from the simulator, what matters is the MMSIM version you're using, not the IC version. The spectre subversion should appear at the top of the spectre log file. What does that report?
Please find the following -
Setup Cadence IC 6.1.5_HF132 Setup Cadence Assura 4.1.2_HF20 for IC 6.1.5_HF132 Setup Cadence PVE 11.12_HF106 for IC 6.1.5_HF132 Setup Cadence MMSIM 11.10_HF509 for IC_6.1.5 HF132 Setup Cadence INCISIV 12.1_HF005 Setup Cadence CONFIRM 11.10
Thank you very very much
Your version of MMSIM (11.1) is quite old and no longer supported. It is quite likely the issue has been fixed in a more recent version of MMSIM. Please consider upgrading to MMSIM15.1 ISR4 (or later).
Customer Support Director - Analog/Mixed-Signal/RF AEs
Cadence Design Systems, Inc.
Thank you very much Andrew for your help.
In reply to Tawna:
Thank you for your response.
Curently I am using the following -
Setup Cadence/IC_6.1.6 Setup Cadence/PVS_14.1 for IC_6.1.6 Setup Cadence/Assura_4.1.4 for IC_6.1.6 Setup Cadence/MMSIM_13.11 for IC_6.1.6 Setup Cadence/INCISIVE_14.10
And still I am getitng the assertion errors.Can you please help with the same?
I found a CCR (1355410) with exactly that error which was fixed in MMSIM14.1 ISR4. The version you've selected is at least a couple of years old, so I'd definitely suggest trying to move to something that is more recent than MMSIM14.1 ISR4.
We've certainly seen this failing when using models from Global Foundries.