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322 Threads found on Lvs Drc
what are drc,......lvs......TIMING CLOSURE
Hi, I would like to know if fixing drc and lvs impacts timing in any way. Is there a chance that it might degrade setup/hold timing?How exactly they are related?
Hello everybody, does anyone have experience on working with Assura on Centos 7? Assura drc is working fine, however lvs fails due to syntax errors after opening the .csm and .cls files for comparison. I know that Centos 7 is not supported, but using a 20 year old OS even in a virtual machine to support those tools has countless limitations.
Hi all, I'm trying to extract parasitics with Cadence Quantus QRC tool after using MG Calibre flow for drc and lvs. The PDK of TSMC 0.18um only provides files for Assure and Calibre. So I've followed Quantus QRC user guide to convert Calibre lvsfile and procfile into QRC supported files. Besides I have also compiled a qrcTechFile, (...)
The idea of using a high-$ verification tool and a free PDK is slightly amusing. The lack of open source verification (drc, extract, lvs) tools makes the availability of multiple "free" layout and schematic design tools almost moot, at least for real work. Some other verification tools (like Silvaco Guardian) will "digest" Caliber erro
Gopal, use nay genric 0.18 model. they will work with SCL. Symica : No layout possible with drc /lvs free layout tools not available. Simulation : free 300 nodes max, bias info (i, V) incomplete . level 49 models will work. simulation OK. Graph : Average , calculator function limited. SCl model will work. Symica clone of IC5141. Electric : p
Probably not "dummy" but rather special purpose. Like you may see met1_vdd and met1_vss in a kit which will all be "ORed" with met1 at mask fab prep but during design, enable a very simple "power short" check by drc (provided you stuck to the discipline) that later lvs would flag, but give no help in locating. Maybe a met6_ind layer would be used
Hi can i do drc, lvs check for a digital design using Caliber tool or is Caliber only meant for analog layouts? If it can be done using Caliber can anyone explain me the steps to do drc lvs checks? I have used caliber before but for analog. What file type must be included in caliber for a digital design. Is it .LEF file? (...)
Can anyone help me with fixing drc/lvs violations. Does anybody know whether IC compiler can fix these errors itself or not? I tried to use signoff autofix drc option of IC compiler which is related to IC validator, but I received these errors: Error: The ICV environment variable has not been specified. (RT-022) Error: Failed
Hi, Can I do physical verification(PV like drc & lvs) using Synopsis ICC tool? If yes, please help me on how can I do it(with the help of pdfs, videos, ppts). Thanks,
Hi Experts, We are designing a SOC from architecture and I need to understand how I can decide of the calibre drc/lvs decks that needs to be used for my technology and the DRM version respectively . I am working on 40nm TSMc. How should I decide what version of the DRM needs to be used and the drc/lvs decks (...)
How to find that there is Latchup effect just after completing layout drc/lvs any tool available. How to find that there is Antenna effect just after completing layout drc/lvs any tool available. If any one have work over it please response. If any one have any pdf/ppt please attach here
I need a schematic based tool such as tanner S-Edit. (Layout, drc,lvs are not required) > I should be able to calculate critical path propagation delay > I should be able to calculate power consumption/dissipation > I should able to measure critical path delay and power consumption for different mos technologies >The technology library
hello! can any one please explain me the difference between lvs runset file and drc runset file in ASIC design Physical Verification? In detail what to be observed if we are provided with the two runset files ? any images or snapshots are accepted for better understanding. thanks
Dear All i have design a transconductance amplifier. done with layout of it.. cleared drc and lvs and PEX. in PEX i m getting some warning. i m not able to understand those warning but because of these warning i m able to generate config view. i m attaching the error file
I'm a fresh man in analog IC design. when I run lvs in calibre, it says calibre lvs rule file compiling error: undefined layer name parameter -- metal 5, I don't know why. Besides, I have no runset files in this process. My drc rule file runs well.
I have some drc errors i can not understand. I was told there are some files that contain an explanation of each drc/lvs error. could anyone help me know where to find them or how to interpret the errors? the technology i am using is TSMC13rf Example: OD.DN.3 { @ {OD OR DOD} density across full chip (minimum) >= 25% DENSITY ALL_OD < (...)
Hi Hkrist, You can add it all over the region, I think your memories meeting required metal density already(Generally memories/IP will be closed with drc/lvs so internally they will take care of density as well) And i think they ll have blockages as well. So you dont need to worry about that, just carry on with your Calibre drc checks.
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
I have drawn the layout checked drc and lvs while extracting the layout the reisitors are not getting extracted pls help this is the error showing in cadence viruoso Delete psf data in /root/simulation/PMOSTEST/spectre/schematic/psf. generate netlist... Begin Incremental Netlisting Jul 6 05:33:48 2015 WARNING (OSSHNL-160): Th
drc - check, that all polygons of your layout satisfy foundry design rules (polygon width, spacing, overlap etc). lvs - extract from you layout the transistor netlist and compare it (element by element) with original netlist (it is not logical equivalence checking, but electrical equivalence). For example, after routing, you may have some shorts (n
Hi everyone, I am using IBM 130nm cmrf8sf PDK. I made a simple inverter and performed drc, lvs, PEX with Calibre. The drc and lvs work well, but there is a PEX error shown as follows: "error: Could not find pin mapping for terminal sub of cell (cmrf8sf devicepad symbol). It will remain unconnected." I don't quite (...)
To accelerate design, I used following commands for multiple CPU processing command in Cadence Encounter APR tcl file: " setMultiCpuUsage -acquireLicense 8 -localCpu max" It seems working fine. For Cadence Virtuoso Calibre drc/lvs, may I use similar tricks to make it run faster? It's pretty slow for a large design. Also, is there a way
ADS can be used for layout if your PDK has layout features for ADS.Otherwise it should have "Cadence Virtuoso Layout tool(s)" feature.( Maybe both..) After finishing the layout, you have to do " Design Rule Checking" (drc) and "Layout Versus Schematic" ( lvs) to be sure that your layout is error-free and the layout is %100 replica of
Hi, I am using cadence Virtuoso. After cleaning the drc related issues I started lvs with the Layout. But I am getting the following errors. ########################################### Layer SEED_inddif_hq_6U1x_2U2x_2T8x_LB DELETED -- LVHEAP = 25/415/618 Layer IND_DIF_HQ_nT_MP_M6 DELETED -- LVHEAP = 25/415/618 Layer IND_HQ_POR
I am installing IBM cmrf7sf6AM on my computer. Calibre drc, lvs are ok. But I check the calibre PEX, there are an error: Compilation Error: 113656 This is the code which makes error (line 90 is in red): PEX MAP ndiff nsd psd nstap nwtap pwtap PEX MAP ndiff nsd psd PEX MAP PC pc_par pc_
Hi, I am currently doing trial runs on an Inverter to test out the Synopsys tools. I have an Inverter that I'm trying to run drc and lvs on before parasitics. drc runs fine. When I try to do the lvs, it exits with an error "Unable to get HERCULES_HOME_DIR". The command being run is lsh -s Inverter.sch_out -stb Inverter -Q (...)
After synthesis you can check your pre-layout timing of the synthesized circuit. After floorplan routing and all you must check lvs and drc of your GDS. Inputs contains RTL file, sdc file .lef files cap table files and standard library files.
Check out LASI, there are some PDKs for it (incl some MOSIS foundries). drc but no lvs, other than you can netlist the layout to SPICE and check function crudely. I would imagine that you could inspect the drc rules tile for XY groundrules. For RLC you'd have to drill into the foundry and see if they left any layer thickness info laying (...)
Hi, I am doing a layout of a simple common-centroid differential pair with multipliers and fingers using IBM 130nm cmrf8sf. drc runs fine. But i get malformed device error: *ERROR* Device 'nfet(Generic)' on Schematic is unbound to any Layout device. Any ideas on how to solve this? Thanks.
LASI from (I think) Idaho State has layout and drc, but no lvs capability. It can produce a SPICE netlist from the layout, which a third party SPICE:SPICE netlist compare tool could use for lvs. There are only a few foundries that have pre-existing support. Electric is fully featured but will only work right for designs created inside (...)
Can someone please explain me this difference?
Prashanth, Cadence PVS (Physical Verification tool) is an advanced drc/lvs engine for drc and lvs check. PVS is specifically for technology nodes below 45nm. Cadence Assura is an older lvs engine which can be used for technology nodes above 45nm.. i.e, 180nm, 130nm.etc., Summary : PVS for 45nm and (...)
Yathin, the techRuleSets and pvtech.lib files can be created by you..Generally it won't be supplied form the foundry. however you can find the pvllvs.rul and pvldrc.rul files in your Cadence Database. For 180nm process, the drc and lvs rule files will usually be placed in the Assura Directory. So browse through your Cadence (...)
Hello friends, I am using UMC 90nm technology in Cadence6.1. I am able to view the results of Assura drc and Assura lvs but when it comes to Assura RCX, then in log file it shows the error as no technology directory can you please help me in this.
Hi all, Please can someone help me with assura to PVS conversion? So how can I convert drc, erc and lvs rule files from one tool to another? Thanks for your advices.
Hello guys, Anyone has any training materials or manuals that can help me writing IC-V drc/lvs decks for advanced nodes? Thank you! Knack
Hi everybody: I am using AMS H35 tech for HV-Processor M0 Chip. The P&R and drc have passed. Now I am using Assura to do lvs and encounter some wired problems. Who has some ideals? thanks and regards Error: Device 'cds_thru(Generic)' on schematic is unbound to any layout device Device 'RDIFFP3(RES)' on Layout is unbound to any Schematic de
I am working on the layout of instrumentation amplifier, my design is hierarchical i.e. there is three op amps in it. The layout of op amp is drc and lvs clean but when i instantiate the layout of op amp in the layout of instrumentation amplifier i got the lvs error. lvs error INCORRECT NETS (...)
I have the skill file for the layout of a simple inverter chain. Do anybody have any idea how to do the drc, lvs checks for the layout and thereby do the extraction followed by post layout simulation to get the AC response through a script?? There are ways to get the ac responses for schematics from OCEAN scripts. So is it possible to write scripts
Hi, There is a option in Calibre.. in which same label metals are shorted virtually while runnin lvs ,drc and PEX. But i dont know about assura.. Thanks
Hi everyone, I can pass the drc and lvs. But when I run PEX, an error occurs: Error MAC3 on line 2498 of $TECHDIR/lvs/Include/ - duplicate DMACRO definition name: SUBC_PROPERTIES. Can anyone tell me what I should do? Thank in advanced
I am trying to produce a clean lvs and drc. According to my schematic, a PFET (non-isolated) transistor has its bulk connected to VDD. Therefore in the layout I have connected the bulk of the PFET device to VDD. Furthermore the p-substrate of the PFET device is connected to ground. According to the drc rules, the p-substrate(connected (...)
What is the difference between an ERC error and a soft check error ? Why in lvs we have these two as different checks? ERC is an independent check program, can be run on schematic already, i.e. long before layout, drc & lvs, hence usually is not included in the lvs set. It is a program which che
Hi everyone, I have just installed Calibre drc, lvs for IBM cmrf7sf V2000 pdk. I don't know how to config the Calibre lvs. This is the instruction: The shell variable TECHDIRshould be set to the directory location of the deck / runset; for example .cshrc - ?setenv TECHDIR path? .kshrc - TECHDIR=?path? Note: The deck has been updated (...)
I believe the Nangate library provides .LIB files with timing information for 45nm node (correct me if I am wrong). You will not get a drc/lvs decks with the library.
Hello, I have downloaded the nangate library and I want to test a layout (that I have synthesized on this library via synopsys and imported it to virtuoso). How can I run drc and lvs checks? I cannot find any rule files. Thanks
Hello all. I am currently trying to make a nor gate layout. I extracted the mos's from the schematic and made the connections. It passed drc but failed lvs with only one mismatch. Any help will be much appreciated. I have attached the layout and the output file, I can attach the schematic too if need be (please let me know). Thank you for reading.
Hello all. I finished my layout for an inverter a couple of hours ago and ran drc and lvs with no errors (they were successful). I then needed to make a layout for an xor gate which used two inverters. After I used the "pick from schematic" option, I instantly ran a drc check, which then gave 228 "Edge not on grid" errors. I know that this (...)
Hi msdarvishi, My TSMC kit does not support Assura, only Calibre. drc is strightforward : "runset" is not compulsory. In the kit installation directory, you should have a "Calibre" directory, with "drc", "lvs" and "rcx" subdirectories. Just load Calibre/drc/calibre.drc rule file for default (...)