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48 Threads found on Lef Gds
basically there are two models,1, AOT(analog on top),make digital as a block,after gds export gds from Encouter and strem gds in the virtuoso,and then connect lines manually.2 DOP(digital on top) abstract the analog blocks'lef ,send them to encounter,and then pr,then merge the gds.
how to differentiate above three, can anyone brief it.
Hi, I am using SOC encounter for APR for the 1st time. It seems a lef file is required for Floorplanning, but I cannot find any lef in the std cell library. So can you please give me any hint ?Is lef mandatory ?
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.
Hi all, I have 2 modules from 3rd party IP vendor and I make some floor plan on top view and then need to pass the top view for P&R, sould I use the 3rd party provided lef file instead of gds layout? Can I simply export the top view to lef file format or have to use abstract generator? Thanks! Dragonwell
Hello all, In my digital design kit, there are many folders gds lef symbol synopsys verilog and so no ,,, what i want to do now is that, i want to import the schematic of every standard cell into virtuoso. the problem is that, i did not find the folder called "Schematic" or "virtuoso" in my kit? i only find the symbols for every ce
lef files is an abstract layout information containing pin and blockage definitions for place and route tools such an Encounter Digital Implementation System. lef files does not contains full layout of a block. You need to import gds files with pads layout into your IC6 library. You can also import lef in your library, use (...)
it is something like this: METAL1 NET 16 0 METAL1 SPNET 16 0 METAL1 PIN 16 0 METAL1 lefPIN 16 0 METAL1 FILL 16 1 METAL1 VIA 16 0 METAL1 VIAFILL 16 1 METAL1 lefOBS 16 0 METAL1 CUSTOM 40 0 NAME METAL1/NET 16 0 NAME METAL1/SPNET 16 0 NAME METAL1/PIN 40 0 NAME METAL1/lefPIN 40 0 lef name, (...)
Hello every one what will be the difference between .lef and .gds. As far as i know both are physical is there any difference between them...
you could change the name as you want. to generate the gds, encounter used a map file between the name you want "ME1" or "totoME1", to the layer number used in the gds, something like this "61:0". You only need to have the technology lef file and all std-cell/macros lef file align to use the same name for the same layer.
may i know on which tool you need to take a lef???
The cell's schematics and layout will be created in a tool such as Cadence Virtuoso. This gives you gds, spice and lef views. To create the .libs, you run a library characterisation tool, such as Encounter Library Characterizer. This will simulate the cells in spice and then build .libs from the results.
You should load the gds in EDI., the lef does not have enough information.
Def could contains netlist, routing, placement, scan info, port... lef is a simplify view of macro/pad views instead using gds, that should contain the pin (metal position size type) and obstruction to allow the PnR to route it.
did you ever able to include this memory into the design? i'm wondering how do you use lef and gds from the memory compiler output in astro as a hard macro. thanks.
~hi, every one, I have the following problem when I am exporting the gds stream in Soc Encounter 9.1 Since the PDK I am using now does not contain the gds file for SRAM macros, only lef file available, I used -outputMacros option when streaming out my design to make the design contain the SRAM macro design information. It seemed fine (...)
you need Cadence IC445 tool, SOC encounter, synopsys tool, virtuoso GUI or gds of Analog block. Once you get .lib file,library compiler can be used to get .db file. Now the Design compiler/primetime can be used to read .db and get verilog file by back annotation. ---------- Post added at 10:27 ---------- Previous post was
When you do your design, instantiate your black boxes in your verilog file. If there is behavior model for a black box, use it in your simulation. In layout, layout tools only care about the lef and LIB file. After you do the APR, merge the gds file of the block boxes with standard cells and IO to spit out the gds for the whole chip.
I guess you've to provide lef for the standard cells. Which tool you're using?
Yes, In your case - LVS & QRC QRC supports two independent flows : 1. LVS flow 2. lef-DEF - also if design is in Open-Access, run QRC before you port to gds or OASIS. rsf is old - ccl is new. The good thing is - same unified qrcTechFi
I know on gds-II streamin icfb can build you a "best guess" techfile. I do not know whether the lef/DEF import does the same, I don't use that. If it does, use that to get a techfile. You can always edit the stream layer table to add the ones that have trouble.
Dear sohailabbas4, Any way can compare lef vs gds to find pin name/size/location mismatch and blockage mistake? also could you provide more scripts to do liberty/timing/documentation or others check for virage mem/stdcell?
Hi All, I am designing PnR for a digital chip using Encounter. Currently we do not have gds files but lef files for std cells from vendor. I am wondering how I can do LVS check in Encounter. Or do I need to use other tools like Assura to do LVS? Since I do not have schematic, whehter I need to convert the netlist into schematic, and which netli
star RCXT can extract from gds, def it require lef file and nxtgrd if you work with def, it will indicate any short nets (not clean, replay :-) in your flow, the star rcxt step will normaly occurs only after the routing & finishing phase and before the STA and to be sync, that depend how you work, by scripting is normaly "clean"
Hi, Just some questions to help with troubleshooting: 1) Did you try using standard cell gds given by the foundry? This is because if you create abstract data, the layers used may not be appropriate - abstraction AFAIK is used to create lef data for digital design, which only uses interconnect (no substrate) layers. You might want to check com
Hi alam, From the foundry, the standard cell libraries u can get are: lef lib timing lib gds lib verilog lib noise libraries, etc., The verilog file from the foundry contains the verilog code (the instantiation and the path delays). In this all the components are independent and they are interconnected. It is a library of verilog compon
Refer any std cell lef file for reference.. or you can check any Macro/IP lef file for the reference.. As far I know, you should not edit the lef files manually.. The reason is that the both gds & lef should be identical to each other.. If u modify the lef manually, you have to ensure that (...)
Hi everyone.. I am new to Astro. I need to synthesis my design but I need a reference library. The manufacturer only provided the following files: tech_lef.lef cell gds file lib files db files I have tried the steps in the Astro manual but I didnt seem to work. I dont know what files should I use and which are not needed.
The LayoutEditor ) is a GPL licensed viewer/editor for gdsII, CIF, OASIS, DXF, lef. It runs under Windows, Linux, Mac OS X.
Hi All, I am getting problem in conversion of blockage layer from OA database to gdsII. Actually I want to convert a memory lef into gds, I am using below flow: Step 1: Converted tech lef & memory lef into OA database (datamodel 4) using lef2oa utility of CCO. I have checked it here, (...)
Hello, Can anyone tell me how to use Cadence Voltage Storm for Power and Rail Analysis? I have this database from Magma (DEF, lef and gds) on which I need to perform the power and rail analysis using Voltage Storm. Whats the flow to achieve the same? Thanks in advance, Chetan
you can directloy read-in gds in encounter. or convert to lef file and then readin
Yes,the Cadence Abstract can extract lef for your APR tool. If you use Synopsys Astro to do PR layout,you can run "Library Data Preparation Flow" to create Milkyway database,it extract gds to FRAM view directly.You can search some scripts on synopsys solvnet to implement this flow automatically.
Helo, I am using Artisan memory generator (single port, sram). I generated the gdsII and lef files. So, now i need to transfer these files to DFII. To do that, I imported gds file via StreamIn to layout cellview and lef file into abstract cellview. Can anyone assist with those questions: 1. Is this all right at (...)
Hi, who has encounter lef to gds2 mapping file(using artisna library) thanks best regards
eaasy way: save OA design and use icfb with OA support if you want uses gds, map file is very important, try let encounter create at 1st time, then modify by your hand, you must know which layer of encounter will translate into the layer of gds. you can to read the tech section of the .lef and icfb file for some clue.
hello, after importing a design in SoC encounter 4.2 , i get an warning of 2 modules not present in the lef file, i.e JKFFX1 and TBUFIXL modules are not present in the lef file, which is rgt? now whats the solution on this...? thanks, Prasad
So far I have prepared the following files for SoC Encounter: a lef file, a netlist file, and a SDC file. According to the manual (search "SoC Encounter Tutorial" on this forum), I am ready to go with Virtual floor plan. However, I am not sure the detail since the tutorial just outlines the steps. Can someone give me some more detail descrip
DEF => Design Exchange Format, Design Exchange Format (DEF) is an open specification for representing physical layout of an integrated circuit in an ASCII format. It represents the netlist and circuit layout. DEF is used in conjunction with lef to represent complete physical layout of an integrated circuit while it is being designed. [
backend view include lef, milkway, spice, cdl file for lvs, sometimes even has gds file. eda tools cannot do physical design without backend view.
Go to Silicon Integration Initiative (Si2), ------------------------------------------------------------------------- lef DEF Format Specification
i know how to generate a single lef files from virtuoso GUI,but how to generated the lef files,verilog files for a analog block that to be used on SOC design?
you can use abstract generator in CIW to create tech.dpux file. It can be dumped by loading any lef file (provided by foundary) in the abstract generator technology manager.
Follow the data prepare manual in Milkyway document in the SOLD. In short brief, lef/gds In -> Smash -> connect PG -> CLF in. Good luck
hi, of course you can , and also you can export def and using def/lef flow
check the gds mapping file, you missed/mixed the text layer. and BF is not perfect handle gds, sometimes you have to do P&R with lef instead.
MAGMA uses .volcano libraries. You can convert your SCell, I/O and Macro libraries into .volcano. You need .lib and lef of them or you may use also gds instead of lef. Usualy you may wish to convert lef into MTcl (MAGMAs´ Tcl extension) add or modify some rules and set them into separate .volcano. In case of (...)
in your case, you should pipo out the gds file and do full gds extraction for analog design. or run abstract first to get the std cell lef file first, and stay with def flow for std cell digital design.