I would like to do a local build with . {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/designs/asap7/riscv32i":{"items":[{"name":"config. Approximately ⌈ [ n u m M a c r o s 3] 1. The SKY130HD enablement available in the OpenROAD-flow-scripts GitHub repo is a five-metal stack enablement. . Describe the bug When building the using docker, this issue arises, perhaps there is a broken link: #0 335. mk","path":"flow/designs/asap7/riscv32i/config. Run global_placement before macro placement. /etc/DependencyInstaller. /build_openroad. The next step is to build it again with the following command: For WSL/docker based installation, run: . In the meantime in openroad-flow-scripts you can try running the prepackaged aes design. OpenROAD reduces barriers of access and tool costs to democratize system and product innovation in silicon. previous. OpenROAD Flow is a full RTL-to-GDS flow built entirely on open-source tools. Subject [Documentation] for documentation errors. gds, etc. For functions the name of the output port can be specified by appending it to the cell type separated by a whitespace. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":". Like most bits of software it contains instructions on how to install and build the required dependencies in order to build the tool itself. Reload to refresh your session. 0. With the advent of the OpenROAD unified application, all of the needed code is built directly there. OpenLane is part of eFabless and the MPW shuttle program. inside docker:I follow the instructions below: source . Problem A- Performance Optimization. 04. Comments. config. paramsaini opened this issue Mar 8, 2023 · 15 comments Comments. Describe the bug build_openroad. log and 6_report. OpenROAD-flow-scripts (ORFS) is a fully autonomous, RTL-GDSII flow for rapid architecture and design space exploration, early prediction of QoR and detailed physical design implementation. lydrc. This time, I forked it to my own repo and made some modifications. New users should start by following the directions in the OpenROAD-flow-scripts repo's flow README. lokki11199 asked this question in Q&A. OpenLane is an automated RTL to GDSII flow that is composed of several tools such as OpenROAD, Yosys, Magic, Netgen, Fault, CVC, SPEF-Extractor, CU-GR, Klayout and a number of scripts used for design exploration and optimization. maliberty assigned vvbandeira Jul 6, 2022. Run `make {script}_issue` in the directory "OpenROAD-flow-scripts/flow" where script is wildcarded from the "OpenROAD-flow-scripts/scripts" directory e. md","path":"docs/user/AddingNewDesign. sh --clean --local --threads 1. The project aims for automated, no-human-in-the-loop digital circuit design with 24-hour turnaround time. github","contentType":"directory"},{"name":"docker","path":"docker. gitignore","contentType":"file"},{"name":"core_tests. script. link to Makefile. Code Generator; Unit Tests (Python) Add Fields in DB Objects; GUI; Partition Management; Restructure; Floorplan. g. sh --local" but run into an issue with CMAKE including pthreads. Closed paramsaini opened this issue Mar 8, 2023 · 15 comments Closed I have an issue while installing open road with open road flow scripts #855. METRICS2. 0. Created 1 month ago. nangate45. The place_pin command places a specific pin in the specified location with the specified size. The set_placement_padding command sets left and right padding in multiples of the row site width. The paper is also available from ACM Digital Library. The . However, ORFS also enables manual intervention for finer user control of individual flow stages through Tcl commands and Python APIs. Metrics¶. The-OpenROAD-Project / OpenROAD-flow-scripts Public. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/scripts":{"items":[{"name":"sc","path":"flow/scripts/sc","contentType":"directory"},{"name":"abc_area. /build_openroad. Export path variables accordingly. /run_docker. Notifications Fork 224; Star 194. Use -instances for instance-specific padding. Although, I recently updated to the newest version, left everything as is, but I got this error:openroad-flow-scripts Last Built. /OpenROAD/src/rcx ). This collection of tools performs all steps required in a full ASIC implementation from RTL to. ACM/IEEE International Conference on Computer-Aided Design, 2021, pp. Returns: name of the new item, either name or actionX. 4. GCD Nangate45 fails to run on fresh ORFS install. . /setup_env. Copy link hoanhe commented Jun 30, 2023. The OpenROAD-flow-scripts repository (build and run scripts) has a BSD 3-Clause License with its text below. ::: qt_debug. Use the -global flag for padding that applies to all instances. vijayank88 CONTRIBUTOR. The restructure module in OpenROAD (rmp) is based on an interface to ABC for local resynthesis. Notifications Fork 230; Star 216. Project has no tags. UC San Diego VLSI CAD Laboratory Location: EBU3 Building 2144 Phone: +1-858-822-5003 Email: openroad@eng. Getting Started with OpenROAD. 24. 2 12. This utility aims to simplify the process of adding a power grid into a floorplan. 暂时无硬性要求. The script build_openroad. Build OpenROAD. At first, I just did git pull under my downloaded directory of "openroad-flow-scripts" first, bypassing the step of . The documentation doesn't seems to talk about OpenROAD commands etc. Stay Updated. A tag already exists with the provided branch name. Building OpenROAD; Getting Started with the OpenROAD Flow - OpenROAD-flow-scripts; Tutorials; Git Quickstart; OpenROAD User Guide. I have successfully built openroad-flow-scripts before. Hi @arlpetergadfort and @maliberty, thanks a lot for your help you guys are amazing!I have almost everything I need for labeling the logic gates!! I have the heatmap for the block with gui::dump_heatmap and the gates locations with your provided TCL snippet. Download pre-built binaries with self-contained dependencies included from the Precision Innovations' Github releases here. "run_synthesis" and "run_floorplan" phases were successful. OpenROAD is a tool to build a chip from synthesizable RTL (Verilog) to completed physical layout (manufacturable, tapeout-clean GDSII). mk. Courtesy of Precision Innovations, they release . The structure of OpenDB is based on the text file formats LEF (library) and DEF (design. #4141 opened Oct 17, 2023 by idokoike. It would be great if someone could test this and point out any corrections in my method described below. #1507 opened on Sep 27 by mithro. OpenRoad-Flow是一个UCSD开源的‘一键式’EDA，它与Berkeley的hammer不同的地方在于, hammer采用敏捷调用商用EDA, OpenRoad主张全自动的‘一键式’。 前者适用于中大型设计，后者适用于小型设计。 硬件要求. github","path":". See instructions here. OpenROAD-flow-scripts$ . The SKY130HD enablement available in the OpenROAD-flow-scripts GitHub repo is a five-metal stack enablement. g. Documentation at - GitHub - yuewuo/OpenROAD-micro. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/designs/src/ibex":{"items":[{"name":"LICENSE","path":"flow/designs/src/ibex/LICENSE","contentType":"file. How to run: #. . skip_initial_place : Skip the initial placement (BiCGSTAB solving) before Nesterov placement. Executing ABC pass (technolo. gds</code> file creation,. tcl script in the script directory. /build_openroad. Code; Issues 81; Pull requests 39; Discussions; Actions; Projects 0; Security; Insights; New issue Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. kernel: Linux 5. 4Tapeouts. OpenROAD Flow. 1. Application (docs): The application is a standalone binary for digital place and route that can be used by any other RTL-GDSII flow controller. mk","path":"flow/designs/gf12/swerv_wrapper/config. Building OpenROAD; Getting Started with the OpenROAD Flow - OpenROAD-flow-scripts; Tutorials; Git Quickstart; OpenROAD User Guide. lib","path":"flow/platforms. OpenROAD uses swig that acts as a wrapper for C/C++ programs to be callable in higher-level languages, such as Python and Tcl. /build_openroad. When running the default gcd flow for NanGate45, I realised that the hold violation count and setup violation count are inconsistent in the final logs. 0-73-generic os: Ubuntu 20. How to get standard cell data (size, pin count, logic function) from the gates of a design? gudeh asked on Oct 2 in Q&A · Unanswered. edu. sh --local [INFO FLW-0002] Updating git submodules. @inproceedings{ajayi2019toward, title={Toward an open-source digital flow: First learnings from the openroad project}, author={Ajayi, Tutu and Chhabria, Vidya A and Foga{c{c}}a, Mateus and Hashemi, Soheil and Hosny, Abdelrahman and Kahng, Andrew B and Kim, Minsoo and Lee, Jeongsup and Mallappa, Uday and Neseem, Marina and others},. The default value is 50, and the allowed values are integers [0, MAX_INT]. For example:The OpenROAD-flow-scripts repository contains source files (e. Global Route #. With the abundant features of METRICS2. lyt) exists for the platform. Extraction Rules Generation Flow for OpenRCX; Messages Glossary; Getting Involved. @dhdhlee Correct name OpenLOAD to OpenROAD Try following option as you're doing 1st time installation. Default Version. Code of conduct¶ Please read our code of conduct here. 3. `. gitignore","path":"flow/test/. Describe the bug. Database. OpenROAD流程 OpenROAD Flow是完全基于开源工具构建的完整的RTL到GDS的流程。该项目旨在实现24小时周转时间的自动化，无人为环的数字电路设计。 内容 代码组织 该存储库用作使用OpenROAD工具的RTL到GDS流程的示例。两个主要组成部分是： tools ：此目录包含整个openroad应用程序的源代码（通过子模块）以及. zerzerzerz commented on October 30, 2023 . Example scripts demonstrating how to run OpenRCX in the OpenROAD environment on sample designs can be found in /test. gds</code> file creation, without requiring human intervention. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/designs/sky130hd/ibex":{"items":[{"name":"autotuner. kernel: Linux 5. I am trying to build OpenRoad locally on my Macbook Pro (Catalina MacOS 10. gds Setting up the Flow ; Clone the repository Create draft PR for updated OpenROAD submodule Create draft PR for updated YOSYS submodule Labelled Ready to Sync Public Mix Both Builds Scan Code with pre commit trigger Test DependencyInstaller script Test Util Scripts Show more workflows. Build with Prebuilt Binaries . /build_openroad. This tutorial covers the installation, configuration, design input, design output, and GUI. No. Saved searches Use saved searches to filter your results more quicklyHello, I am experiencing an issue while running OpenROAD flow specifically for the asap7 platform. Prerequisites# To build and add a new platform for OpenROAD, key technology and library components must be provided based on the technology node. 2-7ubuntu2. github","path":". OpenROAD-flow-scripts (ORFS) is a fully autonomous, RTL-GDSII flow for rapid architecture and design space exploration, early prediction of QoR and detailed physical design implementation. documentation at from code monkey. Building OpenROAD; Getting Started with the OpenROAD Flow - OpenROAD-flow-scripts; Tutorials; Git Quickstart; OpenROAD User Guide. It. sh –> run Steps (A) through (D) of the flow above. Describe the bug. OpenROAD Flow Scripts Tutorial. To keep track of the quality of the results, we maintain inside each design folder two. Git Quickstart. . Creating a branch# You want your master branch to reflect only production-ready code, so create a feature branch for. OpenROAD, yosys source repos; binaries OpenROAD-flow-scripts Structure Flow repository Dockerfiles (containerization) Flow - everything happens here! Source RTL,. {"payload":{"feedbackUrl":". However, ORFS also enables manual intervention for finer user control of individual flow stages through Tcl commands and Python APIs. ). ORFS is maintained by the OpenROAD team and is the primary test bed for OR. Short URLs openroad. pptx)OpenROAD-flow-scripts (ORFS) is a fully autonomous, RTL-GDSII flow for rapid architecture and design space exploration, early prediction of QoR and detailed physical design implementation. The OpenROAD project is a non-profit, DARPA-funded and Google sponsored project committed to creating low-cost and innovative Electronic Design Automation (EDA) tools and flows for IC design. tcl_script: The tcl script to evaluate when the button is pressed. Approximately ⌈ [ n u m M a c r o s 3] 1. Install WSL . I think based on what I have checked (2weeks ago) I think there is an issue with the power/wells pins on the second voltage domains. Code of conduct# {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":". The steps from the RTL-to-GDS flow look like this, usual in a digital flow: Since OpenROAD was developed with digital designs in mind, some features do not natively support analog or mixed-signal designs for now. We have also provided Google Colab packaging for ease of experimentation here. sdc, etc. We provide the nangate45 PDK in the OpenROAD-flow-scripts repo to help. deb installers of OpenROAD for Ubuntu and Debian on a regular basis. For both sweep and tune modes : python3 distributed. 33 while flow uses different version. 2 LTS (Jammy Jellyfish) cmake version 3. The Makefile in this repository will automatically build the OpenROAD toolchain. Users would need to tune other parameters (e. Automatic hyperparameter tuning framework for OpenROAD-flow-script (ORFS) Parametric sweeping experiments for ORFS AutoTuner contains top-level Python script for ORFS,. OpenROAD-flow-scripts (ORFS) is a fully autonomous, RTL-GDSII flow for rapid architecture and design space exploration, early prediction of QoR and detailed physical design implementation. OpenLane is an automated RTL to GDSII flow based on several components including OpenROAD, Yosys, Magic, Netgen and custom methodology scripts for design exploration and optimization. Beta Was this translation helpful. The project team (Qualcomm. Description After we replaced the process library, we used the original data and scripts. sdc file to generate a lot of variants. guide ). . Complex physical design features like building macro functions to do symmetrical placements or arrays, guardbanding, etc. Describe the bug It used to be possible to build openroad on M1, but it currently fails with mpl2 issues despite mpl2 being "removed". ; Random/Grid Search ; Population Based Training OpenROAD is a bit hard to get into without any examples of the toolchain flow. 3. The value is the name of the cell type to use. You may use any kernel supported, such as: CentOS 7, Ubuntu 20. Upload the generated tar file B. PPA Improvements of riscv32i and ibex using OpenROAD Flow Scripts. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow":{"items":[{"name":"designs","path":"flow/designs","contentType":"directory"},{"name":"platforms","path. B. [INFO. . June 8, 2023. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":". {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/platforms/sky130hd":{"items":[{"name":"cdl","path":"flow/platforms/sky130hd/cdl","contentType":"directory. OpenROAD-flow-scripts (ORFS) is a fully autonomous, RTL-GDSII flow for rapid architecture and design space exploration, early prediction of QoR and detailed physical design implementation. github","path":". Database. Build successfully. #1482 opened Sep 19, 2023 by. However, it also enables the creation of any custom flow controllers based on the underlying tools, database and. 76. The aim is to specify a small set of power grid policies to be applied to the design, such as layers to use, stripe width and spacing, then have the utility generate the actual metal straps. script. log file that is generated with every build in the main directory. github","contentType":"directory"},{"name":"docker","path":"docker. 0 -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Check for working CXX compiler: /usr/bin/c++ - skipped -- Detecting CXX. next. 2 -- The CXX compiler identification is GNU 11. def, . OpenDB is a design database to support tools for physical chip design. ; How to start using OpenROAD flow here. tcl where I added. Note: Address Sanitizer adds instrumentation for detecting memory errors. Clone the OpenRoad-flow-scripts commit 5583993. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/scripts":{"items":[{"name":"sc","path":"flow/scripts/sc","contentType":"directory"},{"name":"abc_area. OpenROAD reduces barriers of access and tool costs to democratize system and product innovation in silicon. tcl. Construct and run the container from image, mount coresponding dirs with -v and set display with -e DISPLAY=<YOUR_DISPLAY>. In case of filing issues, it can be uploaded in the \"Relevant log output\" section of OpenROAD-flow-scripts repo issue form. Copy link Contributor. The procedures for the download of prebuilt binaries, building all. In #918, I'm attempting to clean up floorplanning setup for the mock-array-big example. Import all necessary files (Netlist, . Jun 10, 2023 · 2 comments ·. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/designs/nangate45/mempool_group":{"items":[{"name":"config. flow/: contains reference recipes and scripts to run designs through the flow. Download pre-built binaries with self-contained dependencies included from the Precision Innovations’ Github releases here. Building OpenROAD; Getting Started with the OpenROAD Flow - OpenROAD-flow-scripts; Tutorials; Git Quickstart; OpenROAD User Guide. Copy this verilog code into spm. Explore the GitHub Discussions forum for The-OpenROAD-Project OpenROAD-flow-scripts. OpenROAD-flow-scripts provides 3 open-source PDKs to implement designs in: SkyWater 130nm, Nangate 45nm, and ASAP 7nm. Saved searches Use saved searches to filter your results more quicklyFor a technical description of the OpenROAD flow, please refer to our DAC-2019 paper: Toward an Open-Source Digital Flow: First Learnings from the OpenROAD Project. rtfd. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/platforms/nangate45":{"items":[{"name":"cdl","path":"flow/platforms/nangate45/cdl","contentType":"directory. This package also contain memory macro created from FakeRam2. Getting Started with the OpenROAD Flow - OpenROAD-flow-scripts; Tutorials; Git Quickstart; OpenROAD User Guide. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow":{"items":[{"name":"designs","path":"flow/designs","contentType":"directory"},{"name":"platforms","path. github","path":". /flow. 0 -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/platforms/sky130hd":{"items":[{"name":"cdl","path":"flow/platforms/sky130hd/cdl","contentType":"directory. 0; Finally, if you had already boost installed in your system in a place other than /usr/local/ I would file this as a corner case that our. #. Current supported search algorithms are as follows. . Nefelus, Inc. Describe the bug ORFS flow failed at detail route stage [INFO DRT-0036] Pad guide region query size = 0. Using any of the following RISC-V cores from the OpenROAD flow-scripts repository: RISC-V32i, ibex, swerv_wrapper demonstrate the fastest Runtime from RTL-GDSII with good area and performance. However, it also enables the creation of any custom flow controllers based on the underlying tools, database and analysis engines. This greatly helps to reduce the compilation time needed. #4131 opened Oct 14, 2023 by oharboe. Can't build OpenROAD locally. I finally fix it by the following commands. def file to be present in the results directory for all steps, see:. Description I am providing an input DEF where MACROS are arranged in array fashion and are designated as FIXED. @gudeh could you clarify the statement? What was the expected version that it should have fetched and which it did fetch? Note that from the log files you provided before, the script is working as intended -- ie. sewkim merged 11 commits into The-OpenROAD-Project: master from The-OpenROAD-Project-staging: autotuner-update Mar 18, 2022. UC San Diego VLSI CAD Laboratory. We provide detailed instructions in this guide. Subject [Documentation] for documentation errors. The steps from the RTL-to-GDS flow look like this, usual in a digital flow: Since OpenROAD was developed with digital designs in mind, some features do not natively support analog or mixed-signal designs for now. Automatic hyperparameter tuning framework for OpenROAD-flow-script (ORFS) ; Parametric sweeping experiments for ORFS . Note: = indicates default definition assigned by the tool donnon Apr 10Maintainer. Hi, I encountered the same problem. Obviously line numbers with debug information. 0. However, varying the clock period is generating the same synthesized netlist. In #918, I'm attempting to clean up floorplanning setup for the mock-array-big example. ,) and check initial timing report1. The OpenROAD application executes the entire autonomous flow using Tcl scripts that invoke open-sourced tools, from synthesis to the final <code>. OpenROAD . /build_openroad. Instructions to install WSL can be found here. By OpenROAD Team. Getting Started with OpenROAD. AutoTuner provides two main functionalities as. Reload to refresh your session. LogsNo milestone. We provide detailed instructions in this guide. What is needed is that the CORE/DIE_AREA is evaluated when the targets execute. 4. gz. Answered by maliberty. A validated installation of the OpenROAD flow scripts is available. using brew, and did a git clone to get the build scripts. Discuss code, ask questions & collaborate with the developer community. To place an individual pin:PDNGEN. This collection of tools performs all steps required in a full ASIC implementation from RTL to. lef","path":"flow/platforms/asap7/lef/asap7. magic asic rtl verilog vlsi foundry yosys. Install OpenROAD . If that works compare your makefile to the makefile in that design directory. Experimenting with OpenROAD for ECE 4750 ===== OpenROAD is an open-source electronic design automation toolflow that can transform RTL into layout enabling quantitative area, energy, and timing analysis. The-OpenROAD-Project / OpenROAD-flow-scripts Public. OpenROAD-Flow-Scripts Tutorials: Link: Showing 1 to 1 of 1 entries. Varadarajan, “METRICS2. You signed out in another tab or window. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/scripts":{"items":[{"name":"sc","path":"flow/scripts/sc","contentType":"directory"},{"name":"abc_area. See attached tempsense. Blog; Sign up for our newsletter to get our. I think based on what I have checked (2weeks ago) I think there is an issue with the power/wells pins on the second voltage domains. Home Page. OpenROAD-flow-scripts (ORFS) is a fully autonomous, RTL-GDSII flow for rapid architecture and design space exploration, early prediction of QoR and detailed. {"payload":{"allShortcutsEnabled":false,"fileTree":{"flow/util":{"items":[{"name":"cell-veneer","path":"flow/util/cell-veneer","contentType":"directory"},{"name. - List the commands. Enable GKE . are easier in the OpenROAD flow as. Our mission is to democratize IC design, break down barriers of cost and access and mitigate schedule risk through native and open source innovation and collaboration with ecosystem partners. OpenLane is an automated RTL to GDSII flow that is composed of several tools such as OpenROAD, Yosys, Magic, Netgen, Fault, CVC, SPEF-Extractor, CU-GR, Klayout and a number of scripts used for design exploration and optimization. Verify Installation . Using the Flow ; See the OpenROAD documentation here. Using the OpenROAD Flow . Support for Skywater PDK is in progress. Update scripts to use Ethan's new dont_use functionality. After running the dependency installer with the -dev option, I then run ". 1 and Flow Tuning in the IEEE CEDA Robust Design Flow and OpenROAD: J. sh` fails because "git -C" is not supported inside Docker HOT 10. readthedocs. script. luarss commented 3 days ago. The project team (Qualcomm. #1513 opened on Sep 28 by gudeh. You may clone the OpenROAD-flow-scripts repository non-recursively. . garfield118 asked this question in. Database. . #4108 opened Oct 7, 2023 by oharboe. 0-880-gd1c7001ad File Uploads Just have to place these folders in the 'designs/sky130hd/' directory and run it as usual for reproducing the issue:Regardless, here are the common first steps: cd OpenROAD-flow-scripts git checkout master git pull. github","contentType":"directory"},{"name":"docker","path":"docker. This utility aims to simplify the process of adding a power grid into a floorplan. The OpenROAD flow has been validated for feature sizes down to 7nm and used to design and tapeout over 600 ASIC and SoCs to date. @giumaugSubject [Flow] for any util, flow Makefile, or flow script issues. tcl and the other files (like the sdc) referenced by flow. I use make synth to generate the synthesized netlist and change 'clock period' in constraint. In doing so, I either get DRC errors as power straps end up too close to macros, or, if I adjust the pdn config as such to align better with the macros, I get a bunch of Unconnected PDN node on net VDD errors, which I don't know how to fix. For example, 2_floorplan. This post describes how to build using system dependencies on Debian. Options description: item_text: The text to put on the item. To keep track of the quality of the results, we maintain inside each design folder two files:OpenROAD's scripts implementing an RTL-to-GDS Flow. Build Using Docker from pre-built binaries#. Run the executable script run. Code of conduct#Hi everyone. Notifications Fork 233; Star 216. During initial setup or if you have a new machine, run this script: # either run as root or use sudo . [Flow] for any util, flow Makefile, or flow script issues. sh because I built it before, and then directly applied Malibery's solutions. This post describes how to build using system dependencies on Debian. Notifications Fork 229; Star 216. /build_openroad. The OpenROAD-flow-scripts repository contains source files (e. To add support for LVS: Ensure that a KLayout tech file ( . OpenROAD Flow is a project that automates digital circuit design with open-source tools and 24-hour turnaround time. ; How do I contribute? Follow our Git Quickstart guide. I believe these errors match the DRC guidelines for ASAP7, and this drc check can be included for further testing and improving the flow. It extracts a cloud of logic using the OpenSTA timing engine, and passes it to ABC through blif interface.