{"id":28799556,"url":"https://github.com/ooddaa/vhdls","last_synced_at":"2026-02-02T05:03:39.613Z","repository":{"id":276690553,"uuid":"929981873","full_name":"ooddaa/vhdls","owner":"ooddaa","description":null,"archived":false,"fork":false,"pushed_at":"2025-02-23T20:28:50.000Z","size":389,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"master","last_synced_at":"2025-06-18T06:07:34.521Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":"VHDL","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/ooddaa.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2025-02-09T20:48:07.000Z","updated_at":"2025-02-23T20:28:53.000Z","dependencies_parsed_at":null,"dependency_job_id":"be470399-4f2b-4ac1-9c18-5c9bb690abb6","html_url":"https://github.com/ooddaa/vhdls","commit_stats":null,"previous_names":["ooddaa/vhdls"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/ooddaa/vhdls","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ooddaa%2Fvhdls","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ooddaa%2Fvhdls/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ooddaa%2Fvhdls/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ooddaa%2Fvhdls/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/ooddaa","download_url":"https://codeload.github.com/ooddaa/vhdls/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/ooddaa%2Fvhdls/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":29006081,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-02-02T04:25:24.522Z","status":"ssl_error","status_checked_at":"2026-02-02T04:24:51.069Z","response_time":58,"last_error":"SSL_connect returned=1 errno=0 peeraddr=140.82.121.6:443 state=error: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2025-06-18T06:07:34.527Z","updated_at":"2026-02-02T05:03:39.608Z","avatar_url":"https://github.com/ooddaa.png","language":"VHDL","funding_links":[],"categories":[],"sub_categories":[],"readme":"## compile \n`ghdl -a adder.vhd`\n\n## run\n`ghdl -r adder`\n\n## test\nsame `analyze \u0026 run`: \n`ghdl -a adder_tb.vhd` \n`ghdl -r adder_tb`\n\n## produce wavefile \n`ghdl -r adder --wave=adder.ghw`\nor \n`ghdl -r adder --vcd=adder_wave.vcd`\n\n## view wavefile \n`gtkwave adder.ghw`\nor \n`gtkwave adder_wave.vcd`\n\n[Quick Start Guide](https://ghdl.github.io/ghdl/quick_start/index.html)\n# VHDL-2008\nif using\n```\nuse std.env.all;\n```\nwe must add `--std=08` to our `-a, -r` commands:\n\n```\nghdl -a --std=08 debounce_filter.vhd\nghdl -a --std=08 debounce_filter_tb.vhd\nghdl -e --std=08 debounce_filter_tb\nghdl -r --std=08 debounce_filter_tb --vcd=debounce.vcd\n```\n\nVHDL-2008 is a significant revision of the VHDL (VHSIC Hardware Description Language) standard that was released in 2008. It introduced several important improvements over the previous versions (like VHDL-93 and VHDL-2002).\n\nKey features introduced in VHDL-2008 include:\n\n1. Enhanced type system:\n   - Fixed-point and floating-point packages\n   - Better support for mixed-language simulation\n   - Enhanced array types and operations\n\n2. Improved design and verification capabilities:\n   - Force/release statements for debugging\n   - Enhanced generic types\n   - Better package generics\n   - The `std.env` package (which we used with `finish` in our testbench)\n\n3. Simplified coding:\n   - Direct entity instantiation (without needing component declarations)\n   - Enhanced file I/O capabilities\n   - Better support for PSL (Property Specification Language)\n   - External names\n\n4. Better tool support:\n   - Standardized VHDL PSL integration\n   - Enhanced synthesis packages\n   - Improved error handling\n\nFor example, in VHDL-93 you would need to write:\n```vhdl\n-- VHDL-93 style\ncomponent Debounce_Filter is\n  generic (DEBOUNCE_LIMIT : integer);\n  port (...);\nend component;\n\n-- Then instantiate\nUUT: Debounce_Filter \n  generic map (...)\n  port map (...);\n```\n\nWhile in VHDL-2008 you can directly write:\n```vhdl\n-- VHDL-2008 style\nUUT: entity work.Debounce_Filter\n  generic map (...)\n  port map (...);\n```\n\nThe newer standard makes the code more concise and easier to maintain, which is why many modern designs prefer using VHDL-2008 when the tools support it.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fooddaa%2Fvhdls","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fooddaa%2Fvhdls","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fooddaa%2Fvhdls/lists"}