{"id":216,"date":"2011-01-11T23:40:19","date_gmt":"2011-01-11T15:40:19","guid":{"rendered":"http:\/\/www.fujiangyun.com\/?p=216"},"modified":"2011-01-11T23:40:19","modified_gmt":"2011-01-11T15:40:19","slug":"vhdl-%e7%bc%96%e7%a8%8b%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a1%b9","status":"publish","type":"post","link":"https:\/\/www.fujiangyun.com\/blog\/?p=216","title":{"rendered":"VHDL \u7f16\u7a0b\u6ce8\u610f\u4e8b\u9879"},"content":{"rendered":"<h3>1 \u5728VHDL\u4e2d\uff0c\u5171\u67093\u79cd\u5e38\u7528\u5bf9\u8c61\u7c7b\u578b\uff1a\u5e38\u91cf\u3001\u53d8\u91cf\u548c\u4fe1\u53f7\u3002<br \/>\n2 \u5e94\u6ce8\u610f\u7aef\u53e3\u4fe1\u53f7\u7684\u65b9\u5411\u3002Out\u65b9\u5411\u53ea\u80fd\u88ab\u8d4b\u503c\uff1bin\u65b9\u5411\u53ef\u4ee5\u8d4b\u503c\uff1abuffer\u53ef\u4ee5\u8d4b\u503c\u548c\u88ab\u8d4b\u503c\uff1b\u7531\u4e8einout\u5c31\u662f\u8f93\u5165\/\u8f93\u51fa\u7aef\u53e3\uff0c\u56e0\u6b64\u53ef\u4ee5\u8d4b\u503c\u548c\u88ab\u8d4b\u503c\u3002\u7279\u522b\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5f53\u8f93\u51fa\u4fe1\u53f7\u8981\u53cd\u9988\u56de\u53bb\u65f6\uff0c\u5fc5\u987b\u5b9a\u4e49\u4e3ainout\u3002<br \/>\n3 \u4fe1\u53f7\u4f7f\u7528\u4fe1\u53f7\u8d4b\u503c\u7b26\u201c&lt;=\u201d\u3002<br \/>\n4 \u53d8\u91cf\u4f7f\u7528\u53d8\u91cf\u8d4b\u503c\u7b26\u201c:=\u201d\u3002<br \/>\n5 std_logic\u548cstd_logic_vector\u662f\u53ef\u7efc\u5408VHDL\u63cf\u8ff0\u4e2d\u5e38\u89c1\u7684\u6570\u636e\u7c7b\u578b<br \/>\n6 \u5728ieee.std_logic_unsigned.all\u5305\u7684\u652f\u6301\u4e0b\uff0c\u53ef\u8fdb\u884cstd_logic\u548cstd_logic_vector\u7684\u52a0\u51cf\u8fd0\u7b97\u3002<br \/>\n7 \u5728\u540c\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\uff0c\u4fe1\u53f7\u53ef\u4ee5\u88ab\u591a\u6b21\u8d4b\u503c\uff0c\u4f46\u662f\u53ea\u6709\u6700\u540e\u4e00\u4e2a\u8d4b\u503c\u6709\u6548\u3002\u5728\u8fdb\u7a0b\u4e2d\uff0c\u56e0\u4e3a\u8bed\u53e5\u7684\u6267\u884c\u662f\u987a\u5e8f\u7684\uff0c\u867d\u7136\u5bf9\u4e00\u4e2a\u4fe1\u53f7\u6709\u591a\u6b21\u8d4b\u503c\uff0c\u4f46\u662f\u4ecd\u7136\u8ba4\u4e3a\u8be5\u4fe1\u53f7\u5177\u6709\u5177\u6709\u4e00\u6b21\u9a71\u52a8\u3002\u5728\u8fdb\u7a0b\u4e2d\uff0c\u53ef\u4ee5\u5bf9\u4e00\u4e2a\u4fe1\u53f7\u8fdb\u884c\u591a\u6b21\u8d4b\u503c\u3002\u4f46\u662f\uff0c\u53d8\u91cf\u786e\u4e0d\u7136\uff0c\u5728\u4e00\u4e2a\u8fdb\u7a0b\u5185\uff0c\u5bf9\u53d8\u91cf\u7684\u591a\u6b21\u8d4b\u503c\u5b8c\u5168\u53ef\u4ee5\u6309\u7167\u8bbe\u8ba1\u7684\u903b\u8f91\u8fdb\u884c\u3002<br \/>\n8 \u5728\u7ed3\u6784\u4f53\u4e2d\uff0c\u4e0d\u80fd\u5bf9\u4e00\u4e2a\u4fe1\u53f7\u8d4b\u503c\u591a\u6b21\uff0c\u56e0\u4e3a\u5404\u4e2a\u4fe1\u53f7\u8d4b\u503c\u8bed\u53e5\u4e4b\u95f4\u662f\u5e76\u53d1\u5173\u7cfb\u3002<br \/>\n9 \u88ab\u8d4b\u503c\u4fe1\u53f7\u7684\u4f4d\u6570\u4e0e\u8d4b\u4e88\u5b83\u7684\u6570\u503c\u4f4d\u6570\u5fc5\u987b\u76f8\u7b49\uff0c\u5426\u5219\u51fa\u9519\u3002\u4f8b\u5982\uff0c\u5c062\u4f4d\u516b\u8fdb\u5236\u8d4b\u4e884\u4f4d\u903b\u8f91\u77e2\u91cf\u662f\u9519\u8bef\u7684\u3002\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\u7684\u529e\u6cd5\u662f\uff1a\u628a\u4f4d\u6570\u51d1\u9f50\u3002\u4f8b\u59823 bit \u7684std_logic_vector\u548c1\u4f4d\u7684std_logic\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u7684\u65b9\u6cd5\u94fe\u63a5addtemp:=\u20190\u2019&amp;A1&amp;A0+\u20190\u2019&amp;B1&amp;B0+\u201d00\u201d&amp;CYI\uff1b<br \/>\n10 \u4e3a\u4f7f\u8d4b\u503c\u548c\u88ab\u8d4b\u503c\u60c5\u51b5\u4e0b\u4e0d\u51fa\u73b0\u9519\u8bef\uff0c\u53ef\u4ee5\u5728\u7ed3\u6784\u4f53\u5185\u58f0\u660e\u4e0e\u8f93\u5165\u3001\u8f93\u51fa\u7aef\u53e3\u76f8\u540c\u6570\u636e\u7c7b\u578b\u7684\u4fe1\u53f7\u3002\u5728\u7ed3\u6784\u4f53\u4e2d\uff0c\u5148\u5c06\u8f93\u5165\u7aef\u53e3\u8d4b\u4e88\u4fe1\u53f7\uff0c\u7136\u540e\u5728\u5bf9\u4fe1\u53f7\u8fdb\u884c\u903b\u8f91\u5904\u7406\u540e\uff0c\u5728\u7528\u8d4b\u503c\u8bed\u53e5\u5c06\u4fe1\u53f7\u8d4b\u4e88\u8f93\u51fa\u7aef\u53e3\u3002<br \/>\n11 \u5b9a\u4e49\u6574\u5f62\u6570\u8303\u56f4\u7684\u65f6\u5019\uff0c\u8ba1\u6570\u5668\u8ba1\u6570\u7684\u8303\u56f4\u5b9e\u9645\u4e0a\u662f2\u7684n\u6b21\u5e42\u51cf1\u3002\u4f8b\u5982integer rang 0\uff5e128\uff0c\u5b9e\u9645\u4e0a\u4f1a\u8ba1\u6570\u5230255\uff0c\u56e0\u4e3a128\u9700\u89818\u4f4d\u4e8c\u8fdb\u5236\u8868\u793a\u3002<br \/>\n12 Case\u8bed\u53e5\u9700\u8981\u65f6\u949f\u89e6\u53d1\u7684\u3002<br \/>\n13 \u4fe1\u53f7\u91cf\u4e0d\u53ef\u4ee5\u5728\u8fdb\u7a0b\u5185\u5b9a\u4e49\u3002<br \/>\n14 VHDL\u6587\u4ef6\u4e0d\u53ef\u4ee5\u653e\u5728\u6839\u76ee\u5f55\u4e0b\u3002<br \/>\n15 \u5de5\u7a0b\u5305\u62ec\u591a\u4e2a\u6587\u4ef6\u65f6\u9876\u5c42\u5b9e\u4f53\u662f\u603b\u6587\u4ef6\u3002<br \/>\n16 \u5668\u4ef6\u4f8b\u5316\u8bed\u53e5\u4e0d\u80fd\u653e\u5728\u8fdb\u7a0b\u5185<br \/>\n17 \u6709\u201c\uff0b\u201d\u7f16\u8bd1\u4e0d\u80fd\u901a\u8fc7\u7684\u539f\u56e0\u662f\u7f3a\u5c11\u5e93\u6587\u4ef6ieee_logic_unsigned.all\u3002<br \/>\n18 \u65f6\u949f\u89e6\u53d1\u4e0d\u540c\u4e8e clk\u2019EVENT and clk=\u20191\u2019\u3002<\/h3>\n","protected":false},"excerpt":{"rendered":"<p>1 \u5728VHDL\u4e2d\uff0c\u5171\u67093\u79cd\u5e38\u7528\u5bf9\u8c61\u7c7b\u578b\uff1a\u5e38\u91cf\u3001\u53d8\u91cf\u548c\u4fe1\u53f7\u3002<br \/>\n2 \u5e94\u6ce8\u610f\u7aef\u53e3\u4fe1\u53f7\u7684\u65b9\u5411\u3002Out\u65b9\u5411\u53ea\u80fd\u88ab\u8d4b\u503c\uff1bin\u65b9\u5411\u53ef\u4ee5\u8d4b\u503c\uff1abuffer\u53ef\u4ee5\u8d4b\u503c\u548c\u88ab\u8d4b<br \/>\n\u503c\uff1b\u7531\u4e8einout\u5c31\u662f\u8f93\u5165\/\u8f93\u51fa\u7aef\u53e3\uff0c\u56e0\u6b64\u53ef\u4ee5\u8d4b\u503c\u548c\u88ab\u8d4b\u503c\u3002\u7279\u522b\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5f53\u8f93\u51fa<br \/>\n\u4fe1\u53f7\u8981\u53cd\u9988\u56de\u53bb\u65f6\uff0c\u5fc5\u987b\u5b9a\u4e49\u4e3ainout\u3002<br \/>\n3 \u4fe1\u53f7\u4f7f\u7528\u4fe1\u53f7\u8d4b\u503c\u7b26\u201c<=\u201d\u3002\n4 \u53d8\u91cf\u4f7f\u7528\u53d8\u91cf\u8d4b\u503c\u7b26\u201c:=\u201d\u3002\n...........\n<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-216","post","type-post","status-publish","format-standard","hentry","category-4"],"_links":{"self":[{"href":"https:\/\/www.fujiangyun.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/216","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fujiangyun.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fujiangyun.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fujiangyun.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fujiangyun.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=216"}],"version-history":[{"count":0,"href":"https:\/\/www.fujiangyun.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/216\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fujiangyun.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=216"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fujiangyun.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=216"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fujiangyun.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=216"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}