Ghdl macos

Ghdl macos. 6. Precompiled binaries are available for Windows, Gnu/Linux and MacOS-X (PowerPC), but unfortunately, not for MacOS-X (Intel). 2017 - GHDL 0. For Apple Mac, these instructions should allow you to build ghdl-gcc from source. “brew” group given write access: sudo chmod -R g+w $(brew --prefix)/*. GHDL. cannot run llvm-config. 5、10. GHDL can write waveforms to a GHW , VCD or FST file. GHDL currently offers full support for the VHDL-87, 93 and 2002 standards. 20. May 25, 2019 · It’ is a fully featured GTK+ based wave viewer for Unix, Win32, and Mac OSX. These dependencies need to be added to the /lib directory of GHDL while installation. GHDL allows you to compile and execute your VHDL code directly in your PC. Watch tag. . 9 and should work on OS X 10. 8 版本（可在GHDL for Mac OS X下载）。它是 mcode 版本（如在 Windows 上），这意味着它不会生成目标代码或 VHDL 模型的独立可执行文件，因此您无法将外部对象（子程序 Jan 2, 2024 · Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand GHDL At present it is possible to invoke the following GHDL functions by either rightclicking at the editor or at the explorer on the specific file and then selecting the desired funtion. There exists another free application named Simulin, although not open-source, which is a digital circuit simulator for educational purposes. Select the device family depending on your development board. 04-llvm. Downloads. In these instructions, the configure script is executed in the source directory; but you can execute in a different directory too, like this: $ . References: ghdl-yosys-plugin; ghdl/ghdl-cosim; ghdl/ghdl-language-server; ghdl/setup-ghdl-ci; ghdl/docker; ghdl/extended-tests Feb 18, 2021 · GHDL / GTKWave. 36-dev This manual is the user and reference manual for GHDL. com. An easy way to compile Yosys on Windows is to use the project file from the latest run: Go to the Visual Studio Build Action on GitHub. pdf; GTKWave on macOS Apr 11, 2022 · In many senses, we can consider GHDL to be the VHDL equivalent of the Icarus Verilog tool. the GHDL source code tree is available from a Subversion repository: Apr 14, 2024 · By using a code generator (LLVM, GCC or, x86_64/i386 only, a built-in one), it is much faster than any interpreted simulator. 0. so file, and I can’t link an arm64 distribution of yosys to an x86_64-built . echo $(brew --prefix) echo $(groups $(whoami)) OS X gtkwave. VHDL 2008/93/87 simulator. GHDL is a command-line tool that supports VHDL-87, VHDL-93, VHDL-2002, and VHDL-2008 standards. 35 was released. 12. There's this language called VHDL that is used to describe digital circuits. Context. The two source files, shown below, can be used in conjunction with the makefile above to test your new Windows 10 based GHDL development environment. Jul 7, 2019 · GHDL is going to be installed in /opt/Ghdl and /opt is a system directory under root (sudo) control thus make install must be run as sudo else the installation will fail due to write permissions. g. To view waveforms, you have to use a separate waveform viewer like GTKWave. gtkw 的两种文件类型敏感，第一种是 ghdl 波形转储文件，第二种是带有 OS X 后缀的 gtkwave 配置文件，允许通过单击 gtkw 文件调用 gtkwave。配置文件必须在 gtkwave 中设置波形显示后保存，然后才会存在。请参阅 gtkwave 手册。 What is GHDL? GHDL is a shorthand for G Hardware Design Language (currently, G has no meaning). To install gh, paste this in macOS terminal after installing MacPorts. https://cli. Currently, GHDL is only available for the GNU/Linux system, for Windows and Mac OS X. Jul 16, 2020 · a new user is added. Prepackaged distribution : port install gtkwave. 8-arm64. I try installing the GHDL tool to compile my vhdl file. It does not contain an introduction to VHDL. I’ll also include at the end some generic On macOS to allow execution of quarantined files xattr -d com. We can use GHDL on virtually any operating system, including Linux, Windows and macOS. Oct 25, 2013 · VHDL simulation on MacOS X. 3, but ghdl mcode using default GCC(x86_64-linux-gnu-gcc-9), maybe this is the reason caused issue. This packages was provided until VHDL-2002 through the IEEE flavor synopsys. Since then, we’ve been busy preparing our macOS virtual environment for the update and today we’re making the sw May 25, 2017 · I configure the GHDL HEAD (at commit b572c73) using the following command on Mac OS X El Capitan with GNAT GPL 2016 for using the LLVM backend and libbacktrace (specified through an absolute path): $ . For almost 20 years, GHDL was not a synthesis tool: a netlist could not be created. GitHub offers the transfer protocols HTTPS and SSH. I'm using GHDL v. dmg file to open it and see the package (. i386. As you can imagine, there's no language server for it. The boot volume is not only locked, but secured by a cryptographic signature & hash. Ubuntu VHDL linter in neovim. You can still check the behavior of your design with a test bench. While actually programming a CPLD is not possible on Mac, you’re able to compile and simulate: Documentation for ghdl (once Aug 23, 2022 · Tools that I use in my workflow are a part of the oss-cad-suite distribution which contains a number of open source software used in digital logic design. 3. Works on: Windows, Linux, Mac. The goal is to enable the brew command for any user. This command creates or updates a file work-obj93. Then, run ghdl -e hello_world in the shell. For other systems. 37 an experimental --synth feature is available. I primarily use Mac at home, so I set out the weekend before the semester started to find tools that would run on Mac. Editor Option Mar 8, 2022 · One of ghdl's nightly builds, e. You should use SSH if you have a GitHub account and have already uploaded an OpenSSH public key to GitHub, otherwise use HTTPS if you have no account or you want to use login credentials. Solution. Gim supports installers (dynamically loaded modules used for installation or uninstallation) and approches described above are actually implemented by two installers. on 01 Aug 2017. yml and the actions tab for runs of this action! 🚀. Click on the most recent completed run. diogratiacommented Sep 12, 2018. dll / . GTKWave LTS 3. This Action sets envvars GHDL, GHDL_PREFIX, and (on Windows only) MSYS2_PATH. and change CC=gcc to CC=clang in Makefile, it started working, bug fails again: yosys – Yosys Open SYnthesis Suite. Tristan had mentioned the Adacore gnat community 2018 didn't support the -gnat05 switch (nor need it, defaulting to 2005) via email in July when I encountered the same issue building an llvm backend after installing --version 20180523-73 with the gnat-community-2018-20180523-x86_64-darwin-bin. Report an issue with this port. Gim doesn't stop here however. These instructions allow ghdl-0. Using GHDL Jan 27, 2019 · Paebbels added Backend: LLVM GHDL using Low-Level Virtual Machine for code generation OS: Mac OS labels Feb 3, 2019 Paebbels assigned eine Feb 3, 2019 eine mentioned this issue Feb 3, 2019 Cross-Platform Support: ghdl is designed to work on multiple platforms, including Linux, macOS, and Windows. Jun 11, 2020 · I'm trying to build GHDL v. so, the big dynamic library is used, I use a Mac and don't have a tools to interrogate the version of llvm used, from strings and grep it looks like an llvm-10. Usage See test. /path/to/ghdl/configure On Windows, building GHDL with mcode backend and GNAT GPL 32 bit seems to be the only way to get a standalone native executable straightaway. gh is GitHub on the command line. arm64 (Apple Silicon) Install VHDPlus IDE for MacOS. Setup. GHDL currently offers full support for the VHDL-87, 93, and 2002 standards. We can use GHDL on Windows, macOS, or Linux-based operating systems. Top 12% Rank by size . dylib ) please report them in an issue here. ) These packages are prepared by another regular StackOverflow poster, I expect he'll be along any minute to correct any details I've mis-remembered. Compiling the VHDL files with GHDL require two steps: First, you have to compile the file; this is called analysis of a design file in VHDL terms. This cross-platform support ensures that you can use ghdl on your preferred development environment. Some not VHDL-2008 compliant code requests for std_logic_misc in library ieee. It currently has extensive Verilog-2005 support and provides a basic set of synthesis algorithms for various application domains. GHDL runs on GNU/Linux, Windows and macOS; on x86, x86_64, armv6/armv7/aarch32, aarch64 and ppc64. GHDL has also been successfully compiled on Sparc from source. Create two directories under the source directory called {source, testbench}. Run ghdl -a hello. 8 available from ghdl. GHDL is not a synthesis tool: you cannot create a netlist with GHDL (yet). 15. fr (can be downloaded at GHDL for Mac OS X). Usage. Nearly all VHDL87 standard and most features of VHDL93 are supported. Nov 26, 2021 · GHDL. Oct 13, 2015 · GTKW Unable to block on application (GHDL macos) I am able to successfully analyze and run a simple VHDL counter in GHDL on macos, but when launching GTKW, the use of May 6, 2022 · The allocation problem in the Swift compiler, discovered after iOS 11 was released had to do structure alignment. if your result is i386 like in my case. Combined with a GUI-based wave viewer and a good VHDL text editor, GHDL is a very powerful tool for writing, testing and simulating your VHDL code. This is a framework for RTL synthesis tools. Explanation: ghdl: The command to run the GHDL simulator. ). e. Unfortunately, even when analysing with -g and using --ba Dec 20, 2019 · GHDl implements LCS-2016-061 to support conditional analysis. M1 Hi everyone, i’m new here. Example output: The output generated is the help page for the ghdl command, which provides information about the available options, usage examples, and more. Thus, we can use VHDL-2019 sources for 1987, 1993, 2002, 2008, 2019. \n \n \n. VHDL analysis features provided by GHDL are accessed through GHDL fully supports the 1987, 1993, 2002 versions of the IEEE 1076 VHDL standard, and partially the latest 2008 revision (well enough to support fixed_generic_pkg or float_generic_pkg). Hi, I'm trying to install GHDL with LLVM on Ubuntu 18. The current version of GHDL does not contain any graphical viewer: you cannot see signal waves. It is available for various distributions of Linux, macOS, Windows (via Cygwin or MSYS2), and OpenBSD. To prevent the error, I have to add and extra argument to disambiguate the call. A new group, brew, is added per instructions and user 2 was added to the brew group: Change group of installation directory to “brew”: sudo chgrp -R brew $(brew --prefix)/*. 33 (released in October, OS-X packages are being tested, but I'm not sure if they are on the site yet. Can write waveforms to a GHW, VCD or FST file. ghdl-gha-ubuntu-20. Get ghdl-yosys-plugin and: Copy src/* to yosys/frontends/ghdl. /ghdl -a hello. Aug 1, 2017 · VHDL development on Mac. rm -rf $(BUILD_DIR)/ && mkdir $(BUILD_DIR)/. More posts you may like Oct 11, 2023 · Update your Mac Device to macOS Sonoma (MacOS14) and setup gtkwave. UMHDL has been developed in Java language, so it is multi-platform; it has been tested in Windows (32/64-bit), Linux (32/64-bit) and Mac OS X. vhdl in the shell. If you break that it will no longer boot. When loading the libghdldll into Python via pyGHDL. Dec 25, 2023 · The --help option in the ghdl command is used to display the help page. Hence, most of the content in this documentation corresponds to For more information have a look at the GHDL OS X project. $(brew --prefix llvm)/bin/llvm-config --version. While actually programming a CPLD is not possible on Mac, you’re able to compile and simulate: Documentation for ghdl (once Aug 12, 2020 · cd ghdl; mkdir build; cd build. By Steven Karas. 0-dev (2. Nov 7, 2019 · Yesterday, I received the following email from GitHub: On October 7th Apple released Catalina, the latest update to macOS X. I'm afraid I haven't used emacs since the great schism between Gnu and a commercial concern in the '80s. 08. GHDL implements the VHDL language according to the IEEE 1076-1987 or IEEE 1076-1993 standard. 553 2 8 22. GHDL runs on GNU/Linux , Windows and macOS , both on x86 and on x8 6_ 4. Please, provide the following information: OS: MacOS 14 (Running on Mac M1 - Macbook Air) Origin: homebrew. 0-llvm nightly build GHDL 3. Get Yosys sources. It can handle very large designs, such as leon3/grlib. pkg) file within. More instructions. dmg. Run the command sudo make install; It starts of creating some directories for Ghdl. GHDL has been used successfully to simulate the DLX and Leon processors. Lion 10. Then when I built ghdl mcode, met this issue. On Other Systems If you are interested in running GHDL on a different OS not listed here, you can download and compile the GHDL source code available from the download section . Mar 30, 2023 · GHDL; GTKWave; On macOS, install the dependencies via Homebrew with the following command: brew update && brew install ghdl gtkwave && brew cleanup. GHDL fully supports the 1987, 1993, 2002 versions of the IEEE 1076 VHDL standard, and partially the latest 2008 revision (well enough to support fixed_generic_pkg or float_generic_pkg). Engineering tools on Mac OS X. #. Since this is the user and reference manual for GHDL, it does not contain an introduction to VHDL. Paebbels added the Build: Makefile Building GHDL using makefiles (standard Linux, Unix, MacOS environments) label Jan 3, 2017. 119: GTK3 source code, legacy GTK1/2 source code; Flatpak: GTKWave on Flathub; Documentation: gtkwave. Worked clean. Hi, I wanted to know if anyone knows a workaround for using VHDL on the new m1 mac, I tried using Questa on a Virtual machine but it seems like it's not compatible since the arm architecture is not supported by intel. The original Synopsys package cannot be compiled into library ieee, because VHDL-2008 changed the relation between std_ulogic_vector and std_logic_vector. Jun 17, 2023 · The user can choose the IDE language (Spanish, English, etc. Contribute to ghdl/ghdl development by creating an account on GitHub. Description In the documentation it is mentioned that since 0. vhdl سوف تحصل على تنبيه عالي المستوى من نظام التشغيل يقول أن الملف الثنائي غير موقّع وغير مُوثق ، ويمكن أن يحتوي على برامج ضارة. 10 or newer - please report a bug if you have issues! If you see errors about missing libraries ( . fr 提供了适用于 OS X 的 ghdl 版本，该版本在英特尔处理器上运行，适用于10. 7和 10. 34 Oct 29, 2021 · jxhyc. Expected behaviour. Expected behaviour The Oct 25, 2013 · VHDL simulation on MacOS X. 6、10. A community of developers on Github maintains the GHDL code base and regularly releases new updates. Details. VisualStudio project files are created as part of the automated tests on GitHub. Apr 2, 2024 · Mountain Lion 10. One of the key benefits of GHDL is that it can be used for both compilation and simulation. And the fails with the message is can not find gnatmake Paebbels commented Oct 31, 2016. There's a Mac OS X Emacs app found at GNU Emacs For Mac OS X, a universal binary that will run from OS X 10. Unlike the commercial simulators, GHDL is a console-based application; there’s no GUI. /configure --with-llvm-config=/opt/l Description: GHDL: the open-source analyzer, compiler, simulator and (experimental) synthesizer for VHDL Base Group(s): mingw-w64-eda Repo(s): These builds should work for macOS 10. ghw 和 . 2. GHDL GHDL can use multiple back-ends, i. 6/10. See test. It's vhdl-mode configuration includes ghdl should you have it installed. يعرض نظام التشغيل بعد ذلك This is the case for apt (Debian/Ubuntu), dnf (Fedora), pacman (Arch Linux, MSYS2) or brew (macOS). There are several versions including a gcc compiler front end and a just in time direct compile mcode version commonly found on Windows PCs. 8 to 10. Quick Start Guide. 5, 10. GHDL on mac m1 . 8. Open your Applications folder and double-click the macOS installer, named Install [ Version Name ]. GHDL is based on the very popular GNU compiler GCC and runs on Build as part of yosys (not recommended) Get and build GHDL as in the previous section. So after reading this I started to use the llvm I installed with homebrew: using. Member. gde8bb483), reducing the power of 2 in the indices bound below 2**13-1 and the problem quit showing up immediately. > lipo -info surmagic. 7 and 10. Non-fat file: surmagic is architecture: arm64. GHDL_PREFIX := <ghdl install dir>. GHDL is a GPL'ed VHDL simulator. app 对扩展名为 . In Artifacts region find vcxsrc and click on it to download. Add all users who work with brew to the group (like in the attached screenshot from a german macOS). GHDL can be downloaded (cloned) with git clone from GitHub. On a ghdl-macos-11. Nevertheless, multiple explained examples are provided, in the hope that they Feb 28, 2014 · 2. If a GHDL Bug occurred block is shown in the log, please paste it here: Jan 25, 2011 · GHDL is an open-source simulator for the VHDL language. It's likely the problem in GHDL is similar. I’ve installed it by homebrew, but when i try to compile a Dec 1, 2015 · In addition no the source, there are OS-X packages for ghdl-0. libghdl, some dependencies are missing in the GHDL installation directory, if GHDL is installed outside of MinGW64 system. GHDL is a fully open-source VHDL compiler and simulator which is nearly 20 years old. Jul 31, 2022 · edited. 37 from source with LLVM backend in macOS 10. Description. Paebbels added Backend: GCC GHDL using GCC toolchain for code generation Build: Makefile Building GHDL using makefiles (standard Linux, Unix, MacOS environments) CI: AppVeyor Continuous Integration issues related to the AppVeyor platform (Windows-based CI) labels Feb 18, 2017 Apr 30, 2010 · GHDL is a popular open-source compiler and simulator for VHDL. 11. Configure Yosys by adding (to) Makefile. It's only used by electrical engineers. ²Quartus Prime: Quartus Prime is necessary for compiling your code and programming your FPGA. GHDL is an open source and freely available implementation of a VHDL analyzer and simulator written by Tristan Gingold in Ada. GHDL is an open-source simulator for the VHDL language. GHDL is based on the very popular GNU compiler GCC and runs on GHDL is a shorthand for G Hardware Design Language (currently, G has no meaning). It's the mcode version (like on Windows), which means it doesn't produce object codes or a standalone executable of a VHDL model with the consequence you can't bind foreign على سبيل المثال إذا حاولت. app. tgz would have the VITAL libraries installed in library IEEE but would need a compatible llvm install (libLLVM. GHDL runs on Linux, Windows and Apple OS X. Those can be used for running GHDL from shells other than bash. It leverages the GNU Compiler Collection (GCC) infrastructure and can be compiled to run on different operating systems. 5/10. I took a course this semester on FPGA development using VHDL, where the ongoing project is to build a MIPS CPU from scratch. The current version of GHDL does not contain any built-in graphical viewer: you cannot see signal waves. GHDl creates a modification branch, which adds conditional analysis statements into the sources. 0-or-later: Nick Gasson and contributors: VHDL-1993, VHDL-2002, VHDL-2008, partial VHDL-2019: NVC is a GPLv3 VHDL compiler and simulator. ghdl-ls (part of pyGHDL, see below) implements Language Server Protocol (LSP) in Python. Set the environment as described below. I wish to try GHDL v. so / . Place the makefile in the top level directory. ¹Device support: The device support required from quartus to compile for your hardware. This issue is to track the migration of current non free IEEE sources, and openieee, to the open source VHDL packages. Linux and macOS Sep 29, 2019 · Use full IEEE library. GHDL Source. Setup the repositories for LLVM-8 Follow the install steps given on the page May 21, 2017 · Skip to content Jun 10, 2018 · Backend: LLVM GHDL using Low-Level Virtual Machine for code generation Build: Makefile Building GHDL using makefiles (standard Linux, Unix, MacOS environments) Help wanted Comments Copy link Nov 27, 2021 · Testing. yml and the actions tab for runs of this action! 🚀 Mar 19, 2021 · I've just installed the 9a80de3 LLVM MacOS nightly build as I wanted backtrace support for the otherwise useless assertion warnings that are received from the numeric_std package. In order to run GHDL on an Intel-based Macbook Pro, compiling GHDL from source is one option, and various packages (including ADA) need to first be installed. However I recommend ghdl-0. tgz on downloaded file, or run: . It is a VHDL analyzer, compiler, simulator and (experimental) synthesizer that can process (nearly) any VHDL design. 15 (Catalina) because is missing in the pre-built packages. Mar 2, 2021 · Unless someone provides guidelines for cross-compiling GHDL on x86-64 macOS, the solution to this issue will need to be instructions for users to build GHDL themselves. apple. 1. 37 with LLVM backend but the pre-built package for MacOS is missing in the repository. For other Linux distributions you will have to build ghdl from source. I used Dependencies to discover needed libraries. 04/Mint-19 and it fails at the configure step. 36 for MacOS with LLVM backend obtained from the pre-built packages page and it work fine. pkg file, then follow the onscreen instructions to install the macOS installer into your Applications folder. Thus, the reader should have at least a basic knowledge of VHDL. r99. 9. Reply reply More replies. While the other simulators are available free of charge, GHDL is the only open-source alternative for Window, Linux, and Mac. conf: ENABLE_GHDL := 1. There doesn't seem to be a way to install ghdl-yosys-plugin that doesn't involve linking a . /configure --prefix=/ghdl; make ; make install; Before this, I was built ghdl-gcc first then ghdl-llvm, both was successfully installed. Defining a to_string function with default arguments for a user-defined type ends up creating an ambiguity with some function defined internally to GHDL. 8. They have been tested on OSX 10. By using a code generator (llvm, GCC or a builtin one), GHDL is much faster than any interpreted simulator. Create a source directory…. The specific tools I use from the suite include: These are managed inside of a simple Makefile that has the various steps in the workflow outlined. Make make uninstall command run in the root of the GHDL repository uninstall GDHL from the system. ⊚ VHDPlus-0. so file: Jul 17, 2023 · Partial support of PSL. Combined with a GUI -based waveform viewer and a good text editor, GHDL is a very powerful tool for writing, testing and simulating code. Jun 11, 2017 · In System Preferences, go to Users & Groups, click the lock symbol in the bottom left corner to unlock user/group creation, then create a new group called brew-usergroup. It is a VHDL analyzer, compiler and simulator that can execute (nearly) any VHDL program. For instance, GHDL is already tested on GitHub Actions macos-latest, but packaging is not done yet. cf, which describes the library work. Mar 7, 2022 · First, check your Mac's architecture via the command below: > arch. Luckily, I have managed to use ALE to communicate with a free tool called GHDL that does syntax checking for me whenever I exit insert mode. GHDL latest mcode version for Mac OS X versions 10. Build machine is: x86_64-apple-darwin17. Double-click the . github. ghdl-gcc was built with GCC-6. NVC: GPL-3. /activate in extracted location once. In addition, there is also partial support for the VHDL-2008 standard. GTKWave is a fully featured GTK+ based wave viewer for Unix, Win32, and Mac OSX which reads LXT, LXT2, VZT, FST, and GHW files as well as standard Verilog VCD/EVCD files and allows their viewing. 8, i386 SDK 10. 31. Then check the application binary's architecture via the command below: > cd /usr/local/bin. It brings pull requests, issues, and other GitHub concepts to the terminal next to where you are already working with git and your code. GHDL can use multiple back-ends, i. sudo port install gh. Apr 14, 2024 · By using a code generator (LLVM, GCC or, x86_64/i386 only, a built-in one), it is much faster than any interpreted simulator. code generators, (GCC, LLVM or x86/i386 only, a built-in one) and runs on GNU/Linux, Windows ™ and macOS ™ , both on x86 and on x86_64. I created a build folder inside the sources folder: mkdir build cd build I configured with the followi The text was updated successfully, but these errors were encountered: 👍 1. 31 to be built from the source package. 6,10. I've installed LLVM/CLANG following the steps on this page. Unpack downloaded ZIP file. Additional context. Build and install Yosys. Combined with a GUI-based waveform viewer and a good text editor, GHDL is a very powerful tool for writing, testing and simulating your code. GHDL Documentation, Release 0. 31 release - gcc version. It is designed to be highly portable and can run on a variety of platforms, including Windows, Linux, and macOS. 5. 0. Yosys can be adapted to perform any synthesis job by combining the existing passes (algorithms) using synthesis scripts and adding Jun 12, 2013 · ghdl. You can [experimental] ghdl-yosys-plugin is the integration of GHDL as a frontend plugin module for Yosys Open SYnthesis Suite, which uses the libghdl library (built with --enable-synth). quarantine oss-cad-suite-darwin-x64-yyymmdd. Backend 'mcode' For . ghdl-0. 7/10. The created folder <GitRoot>\ghdl is used as Homebrew’s package index There's a version of ghdl for OS X running on Intel processors for versions 10. /ghdl-macos-11-mcode/bin/ghdl Simple and do need to make so much set up. However, in the version build for macOS this is not available. Presumably, you're running Big Sur or newer - you no longer have write permissions to anything at the root of the boot drive, not even if you disable SIP. --help: The option to display the help page. I'm a joe or TextMate user myself these GHDL is a complete VHDL simulator, using the GCC technology. 7. free. Since GHDL supports three different backends and two library sets (regular or GPL-compatible), at least six packages with different features might be available in each package manager. A good knowledge of VHDL language reference manual (usually called LRM) is a plus. qf nj ct yt yj iw tn ap ts sb