Cadence® system design and verification solutions, integrated under our System Development Suite, provide the simulation, acceleration, emulation, and management capabilities.
System Development 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 failed to search the manual and the forum to find a way to copy and rotate a shape I created with any agle like 15, 30, 45 etc.
I noticed some posts said that rotate with any angle may raise lithography issues. But in MEMS application, it's very popular to use all kinds of "strange" shapes. As the line/space is over 1um, the litho problem can be neglected. Then, what can I do in skill code?
Not sure of your application but have you tried
dbCopyFig( d_fig d_cellView [ l_transform ] )
Use the transform option to rotate the object. '((0 0) "R90" 1.0) would rotate the object 90 degrees.
In reply to psill000:
In reply to richardyuan:
There's dbTransformCellView which will transform everything in a cellView by the specified magnification and angle. Note that this cannot transform objects which are constrained to only be at 90 degree multiples (such as instances), so you should normally do this on flat layout.
So if you want to transform selected shapes, what you could do is write a function which moves them (using dbMoveFig) to a temporary cellView, does a dbTransformCellView() and then moves them back to the original cellView.
This is probably easier than trying to write your own code to transform every kind of shape by arbitrary angles. There's leHiRotate, but this is an "hi" function and doesn't have a procedural equivalent.
Hi Richard, Andrew,
Ha; I did not know dbTransformCellView could do that! Andrew is right, of course; that is indeed the easiest solution—provided that function is available in your version of Virtuoso.
I had started writing a small solution; I’ll append it here in case it helps. It basically implements arbitrary affine transformations on points, plus a small dbCopyFig-like helper function:
matrix = VedaGeomAffineMakeIdentity()
matrix = VedaGeomAffineScale(matrix 2.0 0.5)
matrix = VedaGeomAffineRotate(matrix 30*degrees)
VedaGeomAffineCopyFig(fig cv matrix)
I’ve included a tiny demo in the source tree; it draws some shapes on the y* layers of a given cell view:
You can find the code (full of TODOs) here (Git repository, snapshot):
The license is MIT/Expat. Let me know if you need more info… or have some patches :)
In reply to ztzg:
Thank you for your help. As a beginner and not dedicate to layout, it seems hard for me to ultilize your code.
I'll try it when I have time.
In reply to Andrew Beckett:
I tried your solution. It seems have precision issues.
When the rotation angle can divide 360 exactly, like 20,30,60 etc., It looks great.
But when I try to place 19 semilar shapes along a circular edge with same interval, it doesn't work well.
I'm guessing that you're rotating each shape incrementally, which would mean you accumulate rounding errors. You didn't share your code, so that's purely a guess.
I wrote the following:
procedure(CCFcreateRotatedShape(cv layerName angle inner outer width) let((tempCv) tempCv=dbOpenCellViewByType(cv~>libName cv~>cellName "scratch" "maskLayout" "w") dbCreateRect(tempCv layerName list(inner:-width/2.0 outer:width/2.0)) dbTransformCellView(tempCv 1.0 angle) foreach(shape tempCv~>shapes dbCopyFig(shape cv list(0:0 "R0" 1)) ) dbClose(tempCv) t ))procedure(CCFrotateExample(@key (cv geGetEditCellView()) (spines 20) (inner 25) (outer 45) (width 4) (layer1 "Metal3") (layer2 "Metal2")) let((radius) radius=(inner+outer)/2.0 dbCreateEllipse(cv layer1 list(-radius:-radius radius:radius)) for(i 0 sub1(spines) CCFcreateRotatedShape(cv layer2 i*360.0/spines inner outer width) ) ))
And then ran (using gpdk090):
CCFrotateExample(?spines 19 ?layer1 "Via2" ?layer2 "Via5")
(purely to get some pretty colours). As you can see, this looks pretty evenly spaced and the shapes look regular:
The setup has 2000 DBUPerUU so has a good level of resolution - I don't know what your database resolution is compared with the size of your structure.
Your code has two sources of rounding errors.
The first is that you compute the angle as 360/SETS. Since SETS is an integer, and 360 is a literal integer, this is an integer division. So if SETS is 19, this ends up with an angle of 18 rather than 18.94. If you change the expression to 360.0/SETS then this will eliminate this source of rounding error.
The second (much smaller) source is that each time it does a transform cellview, copies the figure and then transforms again. At each transform there will be a small rounding error of each point in the transformed shape to snap it to the database units used because of the resolution of the database. Because you are doing a series of transformations, each starting from the result of the previous transformation, these small errors will accumulate. They may be small enough that you can ignore, but the approach I showed was to transform from the original shape each time and vary the angle each time (so the first rotates by angle, second by 2*angle and so on) and so the small rounding errors would not accumulate.
Oh, what a stupid mistake I've made. Integer divided by integer gets an integer, the skill rule...
That really helps. Thank you andrew.