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47 Threads found on edaboard.com: Cdl Lvs
Hi All, What is the difference between aucdl, aulvs and create cdl settings in PVS - lvs(schematic input section) tool. Please explain if any idea.......... Thanks, Bhanu
Hi, cdl refers to circuit design language i think mostly netlist level language format similar to spice and used in lvs and DRC .gds is graphic database system format is unreadable. It is a binary file format representing planar geometric shapes, text labels, and other information about the layout in hierarchical form. The data can be used to re
Hello friends, I wann make sure what type of cells needs to be included and which needs to excluded while dumping verilog from EDI for lvs run. Mainly my confusion is regarding ENDCAP ENDCAPTIE TBCAP TBCAPNW* CNRCAP* FILLTIE FILLTIEPW etc. Because i dont find cdl (spice) of all these cells in the cdl library. Im sure we dont (...)
check the cell_name and top level name in the gds and cdl should match. from the error it appears that GDS doesn't have the cell at all.... you can do strings it will give you the strings in the gds file....that should have the cdl top level subckt name.
How do You run lvs? In IBM0.13 You need to follow this instruction: 1. In schematic window: 1. Create netlist of schematic. From main menu → IBM_PDK → Netlist → cdl. In new create cdl window (at 1st run) fill a "Library name" and "Top cell" name fields with appropriate names. Change "run" directory if necessary (...)
Hi, When i am running Assura lvs i am getting mismatch between layout & schematics regarding the top cell pins (the pins are at the beggining of the top cell SUBSET definition in the cdl file). How can i prevent this mismatch? Thanks.
Hi All, I have imported a verilog design as a netlist view in cadence virtuoso, and now I am trying to cdl out for running lvs. I have a standard cell library, which has cells with symbol, layout and abstract views. On trying to cdlout I am getting an error that the cellviews are missing sim information which is indeed the case. Since (...)
Hi Manoj, Calibre needs Layout ( in GDS format ) & Source ( Verilog netlist ), which are dumped from the Implementation tools. Later, Verilog Netlist is converted into SPICE format ( cdl ). Now the calibre has GDS & cdl, it starts comparing the connectivity based on the Rules defined in the Rule Deck ( From Foundry ). Coming to ICC, This als
I want to select the netlist cdl file to run lvs with the layout used assura .But I do not know the cdl file format like res cap bjt diode. I think you want the the lvs comparison between layout and a netlist? This is the normal method if you run an lvs between schematic and layout: from both views, first (...)
Hi,all I want to run assura lvs with cdl file and gdsii,so the cdl file is like this: .subckt BJT_AREA40 C B E BJT C B E bjt area=40 .ends BJT_AREA40 .subckt 1 P1 P2 P3 xBJT1 _net1 _net2 _net3 BJT_AREA40 .subckt 1 .end Then I run completely. But That is a question about when we use different area device ,we will get different (...)
What is a characterization in physical design and what is characterization limit? Also how are the spice results after characterization different from the cdl that we are provided for lvs ?
(1) If I have device with multiplicity > 1, I have to generate cdl netlist and use lvs cdl mode. If I use VLDB mode, there will be error indicating multiplicity problems. Yes this is in effect unfortunately,i encountered such a problem with IBM cms9flp last avoid cdl netlisting and respective type of lvs (...)
To be easy, you can replace ND to N2 in cdl file. It is a txt format file. Then use new cdl file for lvs checking. Something wrong in your cdf change.
streamout will by default suppress p-cells as those are usually cadence specific and GDS is not There are options to keep them but that does not seem a good thing in your case If you want someone to check your design for you - cdl - GDS - lvs rule file specific to whatever tools he uses for verification - make sure port stamping in GDS is
i dont know if this is the right place for this sort of question but I want to automate lvs process in cadence. I'm thinking of (preferably small) skill code that does this : (1)opens a cell in the database in schematic view (2)write out a cdl netlist (3)opens layout view of the cell (4)does lvs on the cell (5)writes (...)
Hi Guys, What do the following variables mean? My A.cal file has the following commands: LAYOUT SYSTEM GDSII SOURCE SYSTEM SPICE LAYOUT PATH "A.gds2" LAYOUT PRIMARY "B" SOURCE PATH "C.cdl" SOURCE PRIMARY "B" lvs REPORT calibre_lvs.rep I am using the following commands to run lvs. What do these commands do? (...)
This looks older post - but not having right solution: Transistor level RCX, the input data source is lvs db. This is used to backannotate. If you are trying to create av_extracted view - run lvs with DFII schematic & Layout not cdl & GDS. For cdl GDS flow, create SPICE, Spectre, xDSPF, xSPEF netlist only, as an output from (...)
dear all, now,i need to run lvs for our all digitial project.the GDS file is gotten from a APR tool.but i only have the *.sp file about each standard cell.i can run lvs with *.cdl file.how to run lvs with *.sp file ?thanks! BR
Hello, I couldn't find the solution of my problem so I hope to find an advice here. The problem is that Assura doesn't recognize the device described in the cdl netlist attached to aulvs cellView. I have a cdl netlist of some block (EEPROM) and a layout of this block. For this block I've created the aulvs cel
you can do it easily, but the main task is to prepare the runset file(Which contains the layout info, cdl info & Golden rule file info). Its been long time I worked on calibre, but I'm sure that you can do it. I think you do it easily with the help of shell scripting.
you're using an ibm kit? make sure you created cdl netlist for lvs from the schematic, and in calibre lvs make sure the input netlist is cellname.netlist.lvs and that it is not extracted from the schematic by calibre lvs.
yes, it is possible to generate the schematics , but this method is a dirty fix. Calibre tool(from mentor) will have an utility call ver2lvs . it will convert verilog to lvs netlist or cdl. now you can readin / import this cdl into cadence virtuoso editor to get schematics. once serious drawback is your schematic will (...)
If u check the calibre rule file the layout PMOS device is extracted as P18LL , and the netlist(cdl) it is P18 that is the reason are getting this. both should be identical. first check if there is a device extraction as P18 in rule file. since u r using PDK the is no chance for layer drawing mistakes make sure u re using right type of device
I need to use Calibre to lvs a schematic which has two symbols. One symbol is Cadence schematic view and the other symbol is cdl netlist. cdlIN is not working since this cdl netlist has cell with more than 10k I/O pins. No matter how I tried, this cdl netlist view cannot be recognized by Cadence and, (...)
I am trying to run lvs on a schematic with an instance of a block which does not have schematic view. It has layout+symbol views. However, the schematic is in a .cdl file. Looks like cadence cannot generate the schematic netlist because : "Missing or incorrecto master.tag in library CUSTOM_STANDARD_CELLS cell INVX1 view aucdl schematic" (...)
How do you take care cdl(Spice) file generation if its a Multiple Power domain design?.
resistor and capacitor's w&L , diode area ..... they all can not directly generated . how to i can get them thanks
I am designing a mixed-signal circuit the digital part is implemented using Verilog, synthesized with DC and the backend is done with SOC encounter, now the problem is how to do lvs The standard cell vender gives us a cdl file for lvs, in which it defines the sizes of transistors and their connections, but using simplified PMOS/NMOS (...)
Hi Naveen, I think your giving lvs run from GUI, if so there u will give a run path Go to that path and check for ".cdl" extension file for schematic netlist and ".gds" file for layout extraction correct me if i am wrong
You should define these parameters in inverter's CDF, and list the parameters in the simulator information section for aucdl.
the fingers and multipliers are the same for the lvs tool they're translated into multipliers at the end in the cdl file... choosing fingers and multipliers is the designer's task but regarding the final width...it's just the transistor width multiplied by the fingers and the multipliers...that's all :D
Hi , The problem I am facing is strange. I ve drawn a schematic for a simple inverter.I ve exported the cdl.When I try to look at the netlist, the components are not identified. It is showing me just the following lines in my netlist .subckt tmp VDD VSS IN OUT .ends tmp What could be the problem? Kindly help me ASAP Thanks & Rega
for dracula lvs , I stream out cdl. but the *.cdl has not the parameter m of mosfet. How can I do? thanks in advance
Hi Hussain, When ur doing lvs for top you have the TOP cdl file where inside the TOP cdl file you will INCLUDE all the other cdl files. I guess inside this file you need to specify the list of cells u want Calibre to treat as black boxes.you can do search if you have calibre manual where you can find the syntax and where (...)
I have a digital circuit in Verilog systhesized netlist and a layout generated by place and layout tool. Now I want to do lvs using Assura in Virtuso Layout tool. So how should I set up the Assura lvs form. Just select the netlisf file and layout view? After I did this, I was told there is no information about basic gate, like AND gate and FlipFlop
You should modify CDF Tools -> CDF ->Edit Change simulation information for Aucdl
We are now doing mixed signal layout lvs. The digital circuit is described with verilogHDL, while calibre can only recongnize cdl netlist. How can I deal with this lvs problem? How can I translate verilogHDL to spice netlist? Thanks a lot!
My cdl Netlist: .subckt diode A D0 A GND DW area=20 R0 VDD GND 1k $ XI5 GND VDD inv .ends diode When I run lvs and result as *************************************************** ******** DEVICE MATCHING SUMMARY BY TY
Hi all, Do anyone know how to fix the following discrepancy in Dracula lvs? In my case, I input .cdl netlist for schematics and .gds for layout into Dracula lvs ************** DISCREPANCY 1*********************************** ------------------------------------------------MATCHED DEVICE UNMATCHED NODE---- (Schematic) DEV23761 MOS (...)
You can import the cdl file as a schematic.
Circuit designer provides spice netlist (cdl out with Cadence) to Layout engineer for lvs. The spice netlist is modified manually. So we can't assure the syntex is right. So I want to know if there is some tool that can be used to check the netlist and tell us the syntex error in it.
backend view include lef, milkway, spice, cdl file for lvs, sometimes even has gds file. eda tools cannot do physical design without backend view.
they should have different transitor size there fore different drive strength, you can see it in the cdl part(spice for lvs) in your library.
Hi Guys, Can somebody tell me how to add formula in lvs command file to check the resistor value, for example, I spec the resistor value in the cdl nelist, and I give the squar resistance in the lvs command file: PARAMETER RES 1k, but I need this formula R=1k* to calculate the practice resistor value, and I don't know how to a
here is an example if you have PM NM as PMOS or NMOS in cdl output file and P3, N3 in lvs rule file then just include following line on top of cdl file *.EQUIV PM=P3 NM=N3 so in your case *.EQUIV VN=VNPN1
I run v2lvs to convert verilog to cdl netlist by using as this: v2lvs -lsp stdcell.v -lsp *v -o output.cdl -s0 gnd -s1 vdd -v top_verilog.v But I met another question, since I define the bus such as cir, and which is not recognized, how can I resolve it? I know there's another way to run lvs using (...)
I want to do lvs on a whole chip.And find the cdl of sram can not be imported. The error information is : */WARNING : UNDEFINE PIN :Q IN MODULE :RA1SD IGNORED WHEN THE EXPLICIT FLOATING PORT FUNCTION IS ON */WARNING : UNDEFINE PIN :Q IN MODULE :RA1SD IGNORED WHEN THE EXPLICIT FLOATING PORT FUNCTION