1376 lines
34 KiB
HTML
1376 lines
34 KiB
HTML
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<!doctype html>
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<html lang="en" class="no-js">
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<link rel="next" href="../7.%ED%94%84%EB%A1%9C%EA%B7%B8%EB%9E%A8%EC%8B%A4%EC%8A%B5/">
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<meta name="generator" content="mkdocs-1.6.1, mkdocs-material-9.5.36">
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<title>6.FPGA제작 - FPGA 설계 (RCO ALTERA FPGA IV KIT)</title>
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<link rel="stylesheet" href="../../assets/stylesheets/main.06209087.min.css">
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback">
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
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<script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
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<label class="md-overlay" for="__drawer"></label>
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<div data-md-component="skip">
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<a href="#fpga" class="md-skip">
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Skip to content
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<div data-md-component="announce">
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<header class="md-header md-header--shadow" data-md-component="header">
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href="../.." title="FPGA 설계 (RCO ALTERA FPGA IV KIT)" class="md-header__button md-logo" aria-label="FPGA 설계 (RCO ALTERA FPGA IV KIT)" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg>
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</a>
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<label class="md-header__button md-icon" for="__drawer">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg>
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<div class="md-header__title" data-md-component="header-title">
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<div class="md-header__ellipsis">
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<div class="md-header__topic">
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<span class="md-ellipsis">
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FPGA 설계 (RCO ALTERA FPGA IV KIT)
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</span>
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</div>
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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6.FPGA제작
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</span>
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</div>
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</div>
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</div>
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<script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script>
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<label class="md-header__button md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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</div>
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<ol class="md-search-result__list" role="presentation"></ol>
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</div>
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</div>
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</div>
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</div>
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</nav>
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
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<div class="md-sidebar__scrollwrap">
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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<label class="md-nav__title" for="__drawer">
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<a href="../.." title="FPGA 설계 (RCO ALTERA FPGA IV KIT)" class="md-nav__button md-logo" aria-label="FPGA 설계 (RCO ALTERA FPGA IV KIT)" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg>
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</a>
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FPGA 설계 (RCO ALTERA FPGA IV KIT)
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../.." class="md-nav__link">
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<span class="md-ellipsis">
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시작하기
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_2" >
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<label class="md-nav__link" for="__nav_2" id="__nav_2_label" tabindex="0">
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<span class="md-ellipsis">
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기초실습
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_2_label" aria-expanded="false">
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<label class="md-nav__title" for="__nav_2">
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<span class="md-nav__icon md-icon"></span>
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기초실습
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../%EA%B8%B0%EC%B4%88%EC%8B%A4%EC%8A%B5/1.LEDONOFF/" class="md-nav__link">
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<span class="md-ellipsis">
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1.LEDONOFF
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../%EA%B8%B0%EC%B4%88%EC%8B%A4%EC%8A%B5/2.IN_OUT/" class="md-nav__link">
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<span class="md-ellipsis">
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2.IN_OUT
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../%EA%B8%B0%EC%B4%88%EC%8B%A4%EC%8A%B5/3.CLK/" class="md-nav__link">
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<span class="md-ellipsis">
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3.CLK
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../%EA%B8%B0%EC%B4%88%EC%8B%A4%EC%8A%B5/4.7SEG/" class="md-nav__link">
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<span class="md-ellipsis">
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4.7SEG
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../%EA%B8%B0%EC%B4%88%EC%8B%A4%EC%8A%B5/5.KEY_7SEG/" class="md-nav__link">
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<span class="md-ellipsis">
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5.KEY_7SEG
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../%EA%B8%B0%EC%B4%88%EC%8B%A4%EC%8A%B5/6.CLK_7SEG/" class="md-nav__link">
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<span class="md-ellipsis">
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6.CLK_7SEG
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../%EA%B8%B0%EC%B4%88%EC%8B%A4%EC%8A%B5/7.MODE_SW/" class="md-nav__link">
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<span class="md-ellipsis">
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7.MODE_SW
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</span>
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item md-nav__item--active md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_3" checked>
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<label class="md-nav__link" for="__nav_3" id="__nav_3_label" tabindex="0">
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<span class="md-ellipsis">
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마이컴설계
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_3_label" aria-expanded="true">
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<label class="md-nav__title" for="__nav_3">
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<span class="md-nav__icon md-icon"></span>
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마이컴설계
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../1.%EB%A7%88%EC%9D%B4%EC%BB%B4%EC%84%A4%EA%B3%84/" class="md-nav__link">
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<span class="md-ellipsis">
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1.마이컴설계
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../2.cmd_set/" class="md-nav__link">
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<span class="md-ellipsis">
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2.명령어구성
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../3.%EC%96%B4%EC%85%88%EB%B8%94%EB%9F%AC%EC%9E%91%EC%84%B1/" class="md-nav__link">
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<span class="md-ellipsis">
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3.어셈블러작성
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../4.%EC%BB%B4%ED%8C%8C%EC%9D%BC%EB%9F%AC%EC%9E%91%EC%84%B1/" class="md-nav__link">
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<span class="md-ellipsis">
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4.컴파일러작성
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../5.%EB%8B%A4%EC%9A%B4%EB%A1%9C%EB%8D%94%EC%9E%91%EC%84%B1/" class="md-nav__link">
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<span class="md-ellipsis">
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5.다운로더작성
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<label class="md-nav__link md-nav__link--active" for="__toc">
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<span class="md-ellipsis">
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6.FPGA제작
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<a href="./" class="md-nav__link md-nav__link--active">
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<span class="md-ellipsis">
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6.FPGA제작
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</span>
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</a>
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동작과정 설명
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CPU 구성 블록 설명
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동작 시나리오
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VHDL CODE
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7.프로그램실습
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1.FPGA모델기반설계
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</a>
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2.기능정의
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3.시뮬링크작성
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4.VHDL코드생성
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</span>
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<div class="md-content" data-md-component="content">
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<article class="md-content__inner md-typeset">
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|
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<h1 id="fpga">FPGA제작</h1>
|
|
<p>어셈블리에서 hex 기계어로 변환된 코드를 시리얼로 부터 받아서, 구동하는 프로그램을 VHDL로 작성을 한다.</p>
|
|
<p>지금까지 만든 CPU를 이용한다면 구조는 다음과 같습니다.
|
|
hex 1차 다운로드 → FF FF → 자동 실행
|
|
실행 중 새 hexsend.py 전송
|
|
→ 첫 바이트 수신 순간 CPU 정지
|
|
→ RAM 주소 0부터 다시 저장
|
|
→ FF FF 수신
|
|
→ 새 프로그램 자동 실행</p>
|
|
<h2 id="_1">동작과정 설명</h2>
|
|
<h2 id="cpu">CPU 구성 블록 설명</h2>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>구성요소</th>
|
|
<th>역할</th>
|
|
<th>저장 데이터</th>
|
|
<th>주요 동작</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>PC (Program Counter)</td>
|
|
<td>현재 실행할 명령어 주소 저장</td>
|
|
<td>명령어 주소</td>
|
|
<td>다음 명령어 위치 관리</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Program RAM</td>
|
|
<td>프로그램 저장</td>
|
|
<td>기계어(16비트 명령어)</td>
|
|
<td>UART로 다운로드된 프로그램 저장</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Instruction Decoder</td>
|
|
<td>명령어 해석</td>
|
|
<td>Opcode, Operand</td>
|
|
<td>명령어 종류 판별</td>
|
|
</tr>
|
|
<tr>
|
|
<td>R0 Register</td>
|
|
<td>범용 레지스터</td>
|
|
<td>연산 데이터</td>
|
|
<td>LOAD, INC, DEC 수행</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Delay Block</td>
|
|
<td>시간 지연</td>
|
|
<td>Delay Counter</td>
|
|
<td>지정 시간 동안 대기</td>
|
|
</tr>
|
|
<tr>
|
|
<td>GPIO</td>
|
|
<td>외부 핀 제어</td>
|
|
<td>LED 상태</td>
|
|
<td>LED ON/OFF</td>
|
|
</tr>
|
|
<tr>
|
|
<td>UART RX</td>
|
|
<td>프로그램 다운로드</td>
|
|
<td>수신 데이터</td>
|
|
<td>PC로부터 프로그램 수신</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Boot Loader</td>
|
|
<td>프로그램 적재 제어</td>
|
|
<td>RAM 주소</td>
|
|
<td>RAM 저장 및 실행 시작</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>즉 현재 설계는 <strong>UART Bootloader + Program RAM + Tiny CPU</strong> 구조로, Quartus 재합성 없이 <code>ASM → HEX → UART 다운로드 → 즉시 실행</code>이 가능한 간단한 MCU 형태입니다.</p>
|
|
<h2 id="_2">동작 시나리오</h2>
|
|
<pre><code>
|
|
전원인가
|
|
│
|
|
▼
|
|
CPU_LOAD_PROGRAM
|
|
│
|
|
UART 프로그램 수신
|
|
│
|
|
FF FF 수신
|
|
│
|
|
▼
|
|
CPU_FETCH
|
|
│
|
|
▼
|
|
CPU_DECODE
|
|
│
|
|
▼
|
|
CPU_DELAY
|
|
│
|
|
└───────┐
|
|
│
|
|
▼
|
|
CPU_FETCH
|
|
|
|
|
|
실행 중 UART 데이터 수신
|
|
│
|
|
▼
|
|
CPU_LOAD_PROGRAM
|
|
│
|
|
새 프로그램 수신
|
|
│
|
|
FF FF
|
|
│
|
|
▼
|
|
새 프로그램 실행
|
|
</code></pre>
|
|
<hr />
|
|
<h2 id="_3">핀테이블</h2>
|
|
<p>아래와 같이, VHDL에 사용되는 핀을 대한 할당을 한다.</p>
|
|
<p><img alt="내 사진" src="../imgs/pintable.png" /></p>
|
|
<hr />
|
|
<h2 id="vhdl-code">VHDL CODE</h2>
|
|
<p><a href="../files/micom.vhdl">micom.vhdl 다운로드</a></p>
|
|
<pre><code>library ieee;
|
|
use ieee.std_logic_1164.all;
|
|
use ieee.numeric_std.all;
|
|
|
|
entity micom is
|
|
port (
|
|
clk : in std_logic; -- 50MHz
|
|
reset : in std_logic; -- High reset
|
|
uart_rx : in std_logic;
|
|
led : out std_logic
|
|
);
|
|
end entity;
|
|
|
|
architecture rtl of micom is
|
|
|
|
constant CLK_FREQ : integer := 50000000;
|
|
constant BAUD_RATE : integer := 115200;
|
|
constant BAUD_CNT : integer := CLK_FREQ / BAUD_RATE;
|
|
|
|
type ram_type is array (0 to 255) of std_logic_vector(15 downto 0);
|
|
signal prog_ram : ram_type := (others => x"0000");
|
|
|
|
type uart_state_type is (
|
|
UART_IDLE,
|
|
UART_START,
|
|
UART_DATA,
|
|
UART_STOP
|
|
);
|
|
|
|
signal uart_state : uart_state_type := UART_IDLE;
|
|
signal baud_counter : integer range 0 to BAUD_CNT := 0;
|
|
signal bit_index : integer range 0 to 7 := 0;
|
|
|
|
signal rx_shift : std_logic_vector(7 downto 0) := (others => '0');
|
|
signal rx_byte : std_logic_vector(7 downto 0) := (others => '0');
|
|
signal rx_valid : std_logic := '0';
|
|
|
|
signal byte_high : std_logic_vector(7 downto 0) := (others => '0');
|
|
signal rx_phase : std_logic := '0';
|
|
|
|
signal wr_addr : integer range 0 to 255 := 0;
|
|
signal cpu_run : std_logic := '0';
|
|
|
|
type cpu_state_type is (
|
|
CPU_LOAD_PROGRAM,
|
|
CPU_FETCH,
|
|
CPU_DECODE,
|
|
CPU_DELAY
|
|
);
|
|
|
|
signal cpu_state : cpu_state_type := CPU_LOAD_PROGRAM;
|
|
|
|
signal pc : integer range 0 to 255 := 0;
|
|
signal inst : std_logic_vector(15 downto 0) := x"0000";
|
|
|
|
signal opcode : std_logic_vector(3 downto 0);
|
|
signal operand : unsigned(11 downto 0);
|
|
|
|
signal r0 : unsigned(15 downto 0) := (others => '0');
|
|
signal zflag : std_logic := '0';
|
|
|
|
signal delay_counter : unsigned(31 downto 0) := (others => '0');
|
|
|
|
begin
|
|
|
|
opcode <= inst(15 downto 12);
|
|
operand <= unsigned(inst(11 downto 0));
|
|
|
|
--------------------------------------------------------------------
|
|
-- UART RX
|
|
--------------------------------------------------------------------
|
|
process(clk, reset)
|
|
begin
|
|
if reset = '1' then
|
|
uart_state <= UART_IDLE;
|
|
baud_counter <= 0;
|
|
bit_index <= 0;
|
|
rx_shift <= (others => '0');
|
|
rx_byte <= (others => '0');
|
|
rx_valid <= '0';
|
|
|
|
elsif rising_edge(clk) then
|
|
rx_valid <= '0';
|
|
|
|
case uart_state is
|
|
|
|
when UART_IDLE =>
|
|
if uart_rx = '0' then
|
|
baud_counter <= BAUD_CNT / 2;
|
|
uart_state <= UART_START;
|
|
end if;
|
|
|
|
when UART_START =>
|
|
if baud_counter = 0 then
|
|
if uart_rx = '0' then
|
|
baud_counter <= BAUD_CNT - 1;
|
|
bit_index <= 0;
|
|
uart_state <= UART_DATA;
|
|
else
|
|
uart_state <= UART_IDLE;
|
|
end if;
|
|
else
|
|
baud_counter <= baud_counter - 1;
|
|
end if;
|
|
|
|
when UART_DATA =>
|
|
if baud_counter = 0 then
|
|
rx_shift(bit_index) <= uart_rx;
|
|
baud_counter <= BAUD_CNT - 1;
|
|
|
|
if bit_index = 7 then
|
|
uart_state <= UART_STOP;
|
|
else
|
|
bit_index <= bit_index + 1;
|
|
end if;
|
|
else
|
|
baud_counter <= baud_counter - 1;
|
|
end if;
|
|
|
|
when UART_STOP =>
|
|
if baud_counter = 0 then
|
|
rx_byte <= rx_shift;
|
|
rx_valid <= '1';
|
|
uart_state <= UART_IDLE;
|
|
else
|
|
baud_counter <= baud_counter - 1;
|
|
end if;
|
|
|
|
end case;
|
|
end if;
|
|
end process;
|
|
|
|
--------------------------------------------------------------------
|
|
-- Loader
|
|
-- 실행 중 새 UART 데이터가 들어오면 자동 초기화 후 재다운로드
|
|
--------------------------------------------------------------------
|
|
process(clk, reset)
|
|
variable word_data : std_logic_vector(15 downto 0);
|
|
begin
|
|
if reset = '1' then
|
|
byte_high <= (others => '0');
|
|
rx_phase <= '0';
|
|
wr_addr <= 0;
|
|
cpu_run <= '0';
|
|
|
|
elsif rising_edge(clk) then
|
|
|
|
if rx_valid = '1' then
|
|
|
|
-- CPU 실행 중 새 데이터가 들어오면 기존 실행 중지 후 재다운로드 시작
|
|
if cpu_state /= CPU_LOAD_PROGRAM then
|
|
wr_addr <= 0;
|
|
rx_phase <= '0';
|
|
cpu_run <= '0';
|
|
byte_high <= rx_byte;
|
|
rx_phase <= '1';
|
|
|
|
else
|
|
if rx_phase = '0' then
|
|
byte_high <= rx_byte;
|
|
rx_phase <= '1';
|
|
|
|
else
|
|
word_data := byte_high & rx_byte;
|
|
|
|
if word_data = x"FFFF" then
|
|
cpu_run <= '1';
|
|
rx_phase <= '0';
|
|
|
|
else
|
|
prog_ram(wr_addr) <= word_data;
|
|
|
|
if wr_addr < 255 then
|
|
wr_addr <= wr_addr + 1;
|
|
end if;
|
|
|
|
rx_phase <= '0';
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
|
--------------------------------------------------------------------
|
|
-- CPU
|
|
--------------------------------------------------------------------
|
|
process(clk, reset)
|
|
begin
|
|
if reset = '1' then
|
|
cpu_state <= CPU_LOAD_PROGRAM;
|
|
pc <= 0;
|
|
inst <= x"0000";
|
|
r0 <= (others => '0');
|
|
zflag <= '0';
|
|
delay_counter <= (others => '0');
|
|
led <= '0';
|
|
|
|
elsif rising_edge(clk) then
|
|
|
|
-- 실행 중 UART 데이터가 들어오면 CPU를 초기화하고 다운로드 모드로 전환
|
|
if rx_valid = '1' and cpu_state /= CPU_LOAD_PROGRAM then
|
|
cpu_state <= CPU_LOAD_PROGRAM;
|
|
pc <= 0;
|
|
inst <= x"0000";
|
|
r0 <= (others => '0');
|
|
zflag <= '0';
|
|
delay_counter <= (others => '0');
|
|
led <= '0';
|
|
|
|
else
|
|
case cpu_state is
|
|
|
|
when CPU_LOAD_PROGRAM =>
|
|
if cpu_run = '1' then
|
|
pc <= 0;
|
|
cpu_state <= CPU_FETCH;
|
|
end if;
|
|
|
|
when CPU_FETCH =>
|
|
inst <= prog_ram(pc);
|
|
|
|
if pc < 255 then
|
|
pc <= pc + 1;
|
|
end if;
|
|
|
|
cpu_state <= CPU_DECODE;
|
|
|
|
when CPU_DECODE =>
|
|
case opcode is
|
|
|
|
when x"0" =>
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
when x"1" =>
|
|
r0 <= resize(operand, 16);
|
|
|
|
if operand = 0 then
|
|
zflag <= '1';
|
|
else
|
|
zflag <= '0';
|
|
end if;
|
|
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
when x"2" =>
|
|
r0 <= r0 + 1;
|
|
|
|
if r0 + 1 = 0 then
|
|
zflag <= '1';
|
|
else
|
|
zflag <= '0';
|
|
end if;
|
|
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
when x"3" =>
|
|
r0 <= r0 - 1;
|
|
|
|
if r0 - 1 = 0 then
|
|
zflag <= '1';
|
|
else
|
|
zflag <= '0';
|
|
end if;
|
|
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
when x"4" =>
|
|
pc <= to_integer(operand(7 downto 0));
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
when x"5" =>
|
|
if zflag = '1' then
|
|
pc <= to_integer(operand(7 downto 0));
|
|
end if;
|
|
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
when x"6" =>
|
|
if zflag = '0' then
|
|
pc <= to_integer(operand(7 downto 0));
|
|
end if;
|
|
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
when x"7" =>
|
|
led <= '1';
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
when x"8" =>
|
|
led <= '0';
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
when x"9" =>
|
|
delay_counter <= to_unsigned(to_integer(operand) * 50000, 32);
|
|
cpu_state <= CPU_DELAY;
|
|
|
|
when others =>
|
|
cpu_state <= CPU_FETCH;
|
|
|
|
end case;
|
|
|
|
when CPU_DELAY =>
|
|
if delay_counter = 0 then
|
|
cpu_state <= CPU_FETCH;
|
|
else
|
|
delay_counter <= delay_counter - 1;
|
|
end if;
|
|
|
|
end case;
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
|
end architecture;
|
|
</code></pre>
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