{"id":44609,"date":"2023-09-27T14:45:31","date_gmt":"2023-09-27T06:45:31","guid":{"rendered":"https:\/\/www.techphant.cn\/?p=44609"},"modified":"2023-09-27T14:45:31","modified_gmt":"2023-09-27T06:45:31","slug":"djscksjjmzn","status":"publish","type":"post","link":"https:\/\/www.techphant.cn\/blog\/44609.html","title":{"rendered":"DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\uff1a\u7b80\u660e\u6307\u5357"},"content":{"rendered":"<p>&emsp;&emsp;DMA\uff08Direct Memory Access\uff09\u63a5\u6536\u4e32\u53e3\u6570\u636e\u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u6280\u672f\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u7528\u6237\u66f4\u5feb\u901f\u3001\u66f4\u6709\u6548\u7387\u5730\u63a5\u6536\u6570\u636e\u3002\u672c\u6587\u5c06\u4e3a\u60a8\u4ecb\u7ecdDMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u7684\u539f\u7406\u3001\u4f18\u70b9\u4ee5\u53ca\u4f7f\u7528\u5b83\u65f6\u9700\u8981\u6ce8\u610f\u7684\u7ec6\u8282\u3002<\/p>\n<h2 style=\"text-align: center;\">DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u7684\u539f\u7406<\/h2>\n<p>&emsp;&emsp;DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u4e3b\u8981\u662f\u901a\u8fc7\u4e00\u4e2a\u53eb\u505aDMA\u63a7\u5236\u5668\u7684\u786c\u4ef6\u8bbe\u5907\u6765\u5b9e\u73b0\u7684\u3002\u5b83\u7684\u5de5\u4f5c\u539f\u7406\u662f\uff0c\u5f53\u4e32\u53e3\u8bbe\u5907\u63a5\u6536\u5230\u6570\u636e\u65f6\uff0cDMA\u63a7\u5236\u5668\u5c31\u4f1a\u81ea\u52a8\u5c06\u6570\u636e\u4f20\u8f93\u5230\u5185\u5b58\u4e2d\uff0c\u800c\u4e0d\u9700\u8981CPU\u7684\u53c2\u4e0e\uff0c\u4ece\u800c\u5927\u5927\u63d0\u9ad8\u4e86\u6570\u636e\u7684\u4f20\u8f93\u6548\u7387\u3002<\/p>\n<h3>&emsp;&emsp;DMA\u63a7\u5236\u5668\u7684\u5de5\u4f5c\u8fc7\u7a0b<\/h3>\n<p>&emsp;&emsp;DMA\u63a7\u5236\u5668\u7684\u5de5\u4f5c\u8fc7\u7a0b\u53ef\u4ee5\u5206\u4e3a\u56db\u4e2a\u6b65\u9aa4\uff1a<\/p>\n<ul>\n<li>\u6b65\u9aa41\uff1a\u4e32\u53e3\u8bbe\u5907\u63a5\u6536\u5230\u6570\u636e\u540e\uff0cDMA\u63a7\u5236\u5668\u4f1a\u5c06\u6570\u636e\u4f20\u8f93\u5230\u5185\u5b58\u4e2d\uff1b<\/li>\n<li>\u6b65\u9aa42\uff1aDMA\u63a7\u5236\u5668\u4f1a\u5c06\u6570\u636e\u4f20\u8f93\u5230\u5185\u5b58\u4e2d\uff1b<\/li>\n<li>\u6b65\u9aa43\uff1aDMA\u63a7\u5236\u5668\u4f1a\u68c0\u67e5\u5185\u5b58\u4e2d\u7684\u6570\u636e\uff0c\u5e76\u5c06\u5176\u53d1\u9001\u5230CPU\uff1b<\/li>\n<li>\u6b65\u9aa44\uff1aCPU\u4f1a\u5bf9\u63a5\u6536\u5230\u7684\u6570\u636e\u8fdb\u884c\u5904\u7406\uff0c\u4ece\u800c\u5b9e\u73b0DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u7684\u529f\u80fd\u3002<\/li>\n<\/ul>\n<h2 style=\"text-align: center;\">DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u7684\u4f18\u70b9<\/h2>\n<p>&emsp;&emsp;DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u7684\u4f18\u70b9\u6709\u5f88\u591a\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul>\n<li>1. DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u7684\u901f\u5ea6\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6548\u7387\uff1b<\/li>\n<li>2. DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u53ef\u4ee5\u51cf\u5c11CPU\u7684\u8d1f\u62c5\uff0c\u4ece\u800c\u8282\u7701\u7cfb\u7edf\u7684\u8d44\u6e90\uff1b<\/li>\n<li>3. DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u53ef\u4ee5\u63d0\u9ad8\u7cfb\u7edf\u7684\u6027\u80fd\uff0c\u4ece\u800c\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u3002<\/li>\n<\/ul>\n<h3>&emsp;&emsp;\u4f7f\u7528DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u65f6\u9700\u8981\u6ce8\u610f\u7684\u7ec6\u8282<\/h3>\n<p>&emsp;&emsp;\u4f7f\u7528DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul>\n<li>1. \u5728\u4f7f\u7528DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u65f6\uff0c\u9700\u8981\u786e\u4fdd\u5185\u5b58\u4e2d\u7684\u7a7a\u95f4\u8db3\u591f\uff0c\u4ee5\u4fbf\u80fd\u591f\u63a5\u6536\u5230\u6240\u6709\u7684\u6570\u636e\uff1b<\/li>\n<li>2. \u5728\u4f7f\u7528DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u65f6\uff0c\u9700\u8981\u786e\u4fddDMA\u63a7\u5236\u5668\u7684\u9a71\u52a8\u7a0b\u5e8f\u662f\u6700\u65b0\u7684\uff0c\u4ee5\u4fdd\u8bc1\u6570\u636e\u4f20\u8f93\u7684\u7a33\u5b9a\u6027\uff1b<\/li>\n<li>3. \u5728\u4f7f\u7528DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u65f6\uff0c\u9700\u8981\u786e\u4fdd\u4e32\u53e3\u8bbe\u5907\u7684\u9a71\u52a8\u7a0b\u5e8f\u662f\u6700\u65b0\u7684\uff0c\u4ee5\u4fdd\u8bc1\u6570\u636e\u4f20\u8f93\u7684\u51c6\u786e\u6027\u3002<\/li>\n<\/ul>\n<h2 style=\"text-align: center;\">\u603b\u7ed3<\/h2>\n<p>&emsp;&emsp;<strong>\u672c\u6587\u4ecb\u7ecd\u4e86DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u7684\u539f\u7406\u3001\u4f18\u70b9\u4ee5\u53ca\u4f7f\u7528\u5b83\u65f6\u9700\u8981\u6ce8\u610f\u7684\u7ec6\u8282\u3002<\/strong>DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u7684\u901f\u5ea6\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6548\u7387\uff0c\u8282\u7701\u7cfb\u7edf\u7684\u8d44\u6e90\uff0c\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u3002\u4f46\u662f\uff0c\u5728\u4f7f\u7528DMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u65f6\uff0c\u8fd8\u9700\u8981\u6ce8\u610f\u4e00\u4e9b\u7ec6\u8282\uff0c\u6bd4\u5982\u786e\u4fdd\u5185\u5b58\u7a7a\u95f4\u8db3\u591f\uff0cDMA\u63a7\u5236\u5668\u548c\u4e32\u53e3\u8bbe\u5907\u7684\u9a71\u52a8\u7a0b\u5e8f\u662f\u6700\u65b0\u7684\u7b49\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DMA\uff08DirectMemoryAccess\uff09\u63a5\u6536\u4e32\u53e3\u6570\u636e\u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u6280\u672f\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u7528\u6237\u66f4\u5feb\u901f\u3001\u66f4\u6709\u6548\u7387\u5730\u63a5\u6536\u6570\u636e\u3002\u672c\u6587\u5c06\u4e3a\u60a8\u4ecb\u7ecdDMA\u63a5\u6536\u4e32\u53e3\u6570\u636e\u7684\u539f\u7406\u3001\u4f18\u70b9\u4ee5\u53ca<\/p>\n","protected":false},"author":1,"featured_media":4132,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-global-header-display":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","footnotes":""},"categories":[36],"tags":[69],"class_list":["post-44609","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-cktx"],"_links":{"self":[{"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/posts\/44609","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/comments?post=44609"}],"version-history":[{"count":0,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/posts\/44609\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/media\/4132"}],"wp:attachment":[{"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/media?parent=44609"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/categories?post=44609"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/tags?post=44609"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}