| # howo to run openroad by reading an existing DEF file |
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| Tool: OpenDB |
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| Subcategory: Initialization from existing DEF |
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| ## Conversation |
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| ### bittnada |
| Hello
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| I have a DEF file in which row, track, components, and pins are written.
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| The position of the cells are on the step of global placement, obtained by using another method.
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| Now, I want to finish the rest of the procedures by modifying "test/flow.tcl" file.
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| I just skipped the steps of pin placement and global placement and added "read_def [my_def_fiel}'", but it did not work.
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| I will appreciate if anyone let me know how to solve this problem.
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| Thanks,
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| ### maliberty |
| What happened when it "did not work"? Its not much to go on. |
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| ### bittnada |
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| Sorry for my delayed response.
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| I've just conducted a test using gcd_nangate45.tcl, and I've created my own DEF file containing rows, tracks, pins, nets, and components. I performed a simple test by modifying a flow.tcl script to skip buffer insertion, IO placement, Macro Placement, tap cell insertion, power distribution, and global placement, and then adding "read_def".
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| After running gcd_nangate45.tcl, I received the following output:
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| ====================================================================================
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| OpenROAD v2.0-13652-g6fc686431
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| Features included (+) or not (-): +Charts +GPU +GUI +Python
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| This program is licensed under the BSD-3 license. See the LICENSE file for details.
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| Components of this program may be licensed under more restrictive licenses which must be honored.
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| [INFO ODB-0227] LEF file: Nangate45/Nangate45_tech.lef, created 22 layers, 27 vias
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| [INFO ODB-0227] LEF file: Nangate45/Nangate45_stdcell.lef, created 135 library cells
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| [WARNING STA-0441] set_input_delay relative to a clock defined on the same port/pin not allowed.
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| [INFO IFP-0001] Added 57 rows of 422 site FreePDK45_38x28_10R_NP_162NW_34O.
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| [INFO ORD-0048] Loading an additional DEF.
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| Error: Chip already exists
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| [INFO RSZ-0058] Using max wire length 693um.
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| [INFO RSZ-0039] Resized 41 instances.
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| Placement Analysis
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| ---------------------------------
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| total displacement 17739.5 u
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| average displacement 49.0 u
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| max displacement 62.9 u
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| original HPWL 280.4 u
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| legalized HPWL 9839.7 u
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| delta HPWL 3410 %
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| worst slack 0.105
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| worst slack -0.011
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| tns -0.011
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| [INFO CTS-0050] Root buffer is BUF_X4.
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| [INFO CTS-0051] Sink buffer is BUF_X4.
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| [INFO CTS-0052] The following clock buffers will be used for CTS:
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| BUF_X4
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| [INFO CTS-0049] Characterization buffer is BUF_X4.
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| [INFO CTS-0007] Net "clk" found for clock "core_clock".
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| [WARNING CTS-0041] Net "clk" has 0 sinks. Skipping...
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| [WARNING CTS-0083] No clock nets have been found.
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| [INFO CTS-0008] TritonCTS found 0 clock nets.
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| [WARNING CTS-0082] No valid clock nets in the design.
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| [INFO RSZ-0058] Using max wire length 693um.
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| Placement Analysis
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| ---------------------------------
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| total displacement 0.0 u
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| average displacement 0.0 u
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| max displacement 0.0 u
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| original HPWL 9839.7 u
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| legalized HPWL 9839.7 u
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| delta HPWL 0 %
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| [INFO RSZ-0094] Found 1 endpoints with setup violations.
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| [WARNING RSZ-0075] makeBufferedNet failed for driver _393_/ZN
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| [WARNING RSZ-0075] makeBufferedNet failed for driver _393_/ZN
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| [WARNING RSZ-0075] makeBufferedNet failed for driver _393_/ZN
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| [WARNING RSZ-0075] makeBufferedNet failed for driver _393_/ZN
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| [INFO RSZ-0041] Resized 5 instances.
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| [INFO RSZ-0043] Swapped pins on 2 instances.
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| [INFO RSZ-0033] No hold violations found.
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| worst slack 0.106
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| worst slack 0.000
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| tns 0.000
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| Placement Analysis
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| ---------------------------------
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| total displacement 91.3 u
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| average displacement 0.3 u
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| max displacement 6.4 u
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| original HPWL 9840.8 u
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| legalized HPWL 9925.0 u
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| delta HPWL 1 %
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| [INFO DRT-0149] Reading tech and libs.
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| Units: 2000
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| Number of layers: 21
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| Number of macros: 135
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| Number of vias: 27
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| Number of viarulegen: 19
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| Signal 11 received
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| Stack trace:
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| 0# 0x0000564758181A44 in /mnt/work/OpenROAD/bin/bin/openroad
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| 1# 0x00007F4028F54F10 in /lib/x86_64-linux-gnu/libc.so.6
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| 2# odb::dbTechVia::getTopLayer() in /mnt/work/OpenROAD/bin/bin/openroad
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| 3# odb::dbWireEncoder::addTechVia(odb::dbTechVia*) in /mnt/work/OpenROAD/bin/bin/openroad
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| 4# drt::TritonRoute::stackVias(odb::dbBTerm*, int, int, bool) in /mnt/work/OpenROAD/bin/bin/openroad
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| 5# drt::TritonRoute::processBTermsAboveTopLayer(bool) in /mnt/work/OpenROAD/bin/bin/openroad
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| 6# drt::TritonRoute::initDesign() in /mnt/work/OpenROAD/bin/bin/openroad
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| 7# drt::TritonRoute::pinAccess(std::vector<odb::dbInst*, std::allocator<odb::dbInst*> > const&) in /mnt/work/OpenROAD/bin/bin/openroad
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| 8# pin_access_cmd(char const*, char const*, char const*, int, int) in /mnt/work/OpenROAD/bin/bin/openroad
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| 9# 0x00005647589E491B in /mnt/work/OpenROAD/bin/bin/openroad
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| 10# TclNRRunCallbacks in /usr/lib/x86_64-linux-gnu/libtcl8.6.so
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| 11# 0x00007F402E79BFBA in /usr/lib/x86_64-linux-gnu/libtcl8.6.so
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| 12# Tcl_EvalEx in /usr/lib/x86_64-linux-gnu/libtcl8.6.so
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| 13# Tcl_Eval in /usr/lib/x86_64-linux-gnu/libtcl8.6.so
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| 14# gui::TclCmdInputWidget::executeCommand(QString const&, bool, bool) in /mnt/work/OpenROAD/bin/bin/openroad
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| 15# gui::CmdInputWidget::handleEnterKeyPress(QKeyEvent*) in /mnt/work/OpenROAD/bin/bin/openroad
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| 16# gui::TclCmdInputWidget::keyPressEvent(QKeyEvent*) in /mnt/work/OpenROAD/bin/bin/openroad
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| 17# QWidget::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
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| 18# QFrame::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
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| 19# QAbstractScrollArea::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
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| 20# QPlainTextEdit::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
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| 21# QApplicationPrivate::notify_helper(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
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| 22# QApplication::notify(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
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| 23# QCoreApplication::notifyInternal2(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
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| 24# 0x00007F402B1357B5 in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
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| 25# QApplicationPrivate::notify_helper(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
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| 26# QApplication::notify(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
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| 27# QCoreApplication::notifyInternal2(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
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| 28# QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
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| 29# QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
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| 30# QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
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| 31# 0x00007F4022595260 in /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
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| 32# g_main_context_dispatch in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
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| 33# 0x00007F402783C770 in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
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| 34# g_main_context_iteration in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
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| 35# QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
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| 36# QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
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| 37# QCoreApplication::exec() in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
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| 38# gui::startGui(int&, char**, Tcl_Interp*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /mnt/work/OpenROAD/bin/bin/openroad
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| 39# ord::tclAppInit(Tcl_Interp*) in /mnt/work/OpenROAD/bin/bin/openroad
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| 40# Tcl_MainEx in /usr/lib/x86_64-linux-gnu/libtcl8.6.so
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| 41# main in /mnt/work/OpenROAD/bin/bin/openroad
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| 42# __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6
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| 43# _start in /mnt/work/OpenROAD/bin/bin/openroad
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| ================================================================================================
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| I also examined the source codes and realized that the testing approach I employed did not yield the desired results. However, I am unsure about how to proceed from the step after global placement by reading the DEF file.
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| Thanks. |
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