{"id":56553,"date":"2023-10-23T10:52:44","date_gmt":"2023-10-23T02:52:44","guid":{"rendered":"https:\/\/www.techphant.cn\/?p=56553"},"modified":"2023-10-23T10:52:44","modified_gmt":"2023-10-23T02:52:44","slug":"dfsxzfsbzd","status":"publish","type":"post","link":"https:\/\/www.techphant.cn\/blog\/56553.html","title":{"rendered":"DMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad"},"content":{"rendered":"

  DMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u8ba1\u7b97\u673a\u7cfb\u7edf\u4e2d\u65ad\u5904\u7406\u673a\u5236\uff0c\u5b83\u80fd\u591f\u63d0\u9ad8\u8ba1\u7b97\u673a\u7cfb\u7edf\u7684\u6027\u80fd\uff0c\u4f7f\u5f97\u7cfb\u7edf\u80fd\u591f\u66f4\u5feb\u5730\u5904\u7406\u4e2d\u65ad\u3002\u672c\u6587\u5c06\u4ecb\u7ecdDMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u7684\u539f\u7406\uff0c\u4ee5\u53ca\u5b83\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u4f18\u52bf\u548c\u7f3a\u70b9\u3002<\/p>\n

DMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u7684\u539f\u7406<\/h2>\n

  DMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u662f\u4e00\u79cd\u5229\u7528DMA\u6280\u672f\uff08Direct Memory Access\uff09\u63a7\u5236\u5b57\u7b26\u8bbe\u5907\u7684\u4e2d\u65ad\u5904\u7406\u673a\u5236\u3002DMA\u65b9\u5f0f\u4e0b\u7684\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u53ef\u4ee5\u5c06\u5b57\u7b26\u8bbe\u5907\u7684\u4e2d\u65ad\u5904\u7406\u4ece\u4e3b\u673a\u5904\u7406\u5668\uff08CPU\uff09\u632a\u5230\u4e13\u7528\u7684DMA\u63a7\u5236\u5668\uff08DMA Controller\uff09\u4e0a\uff0c\u4ece\u800c\u51cf\u8f7bCPU\u7684\u8d1f\u62c5\uff0c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6027\u80fd\u3002<\/p>\n

  DMA\u7684\u5de5\u4f5c\u539f\u7406<\/h3>\n

  DMA\u6280\u672f\u7684\u5de5\u4f5c\u539f\u7406\u662f\uff0c\u5f53\u7cfb\u7edf\u53d1\u751f\u4e2d\u65ad\u65f6\uff0cDMA\u63a7\u5236\u5668\u4f1a\u81ea\u52a8\u5411\u5b57\u7b26\u8bbe\u5907\u53d1\u51fa\u8bfb\u53d6\u6307\u4ee4\uff0c\u7136\u540e\u5c06\u5b57\u7b26\u8bbe\u5907\u8bfb\u53d6\u5230\u7684\u6570\u636e\u5b58\u50a8\u5230\u5185\u5b58\u4e2d\uff0c\u6700\u540e\u5c06\u5185\u5b58\u4e2d\u7684\u6570\u636e\u53d1\u9001\u7ed9CPU\u5904\u7406\u3002DMA\u63a7\u5236\u5668\u53ef\u4ee5\u5b9e\u73b0\u6570\u636e\u7684\u81ea\u52a8\u8bfb\u5199\uff0c\u800c\u65e0\u9700CPU\u7684\u53c2\u4e0e\uff0c\u4ece\u800c\u53ef\u4ee5\u6781\u5927\u5730\u63d0\u9ad8\u7cfb\u7edf\u7684\u6027\u80fd\u3002<\/p>\n

  DMA\u7684\u4f18\u52bf<\/h3>\n

  DMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u4e0d\u4ec5\u53ef\u4ee5\u51cf\u8f7bCPU\u7684\u8d1f\u62c5\uff0c\u800c\u4e14\u53ef\u4ee5\u63d0\u9ad8\u7cfb\u7edf\u7684\u6570\u636e\u4f20\u8f93\u901f\u5ea6\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6027\u80fd\u3002\u6b64\u5916\uff0cDMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u8fd8\u53ef\u4ee5\u63d0\u9ad8\u5b57\u7b26\u8bbe\u5907\u7684\u53ef\u9760\u6027\uff0c\u56e0\u4e3aDMA\u63a7\u5236\u5668\u5177\u6709\u81ea\u52a8\u8bfb\u5199\u6570\u636e\u7684\u80fd\u529b\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u6570\u636e\u7684\u4e22\u5931\u3002<\/p>\n

  DMA\u7684\u7f3a\u70b9<\/h3>\n

  \u5c3d\u7ba1DMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u5177\u6709\u8bb8\u591a\u4f18\u52bf\uff0c\u4f46\u4e5f\u5b58\u5728\u4e00\u4e9b\u7f3a\u70b9\u3002\u9996\u5148\uff0cDMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u7684\u5b9e\u73b0\u9700\u8981\u8f83\u591a\u7684\u786c\u4ef6\u8d44\u6e90\uff0c\u56e0\u6b64\u6210\u672c\u6bd4\u8f83\u9ad8\u3002\u5176\u6b21\uff0cDMA\u63a7\u5236\u5668\u672c\u8eab\u4e5f\u9700\u8981\u4e00\u5b9a\u7684\u5904\u7406\u80fd\u529b\uff0c\u5982\u679cDMA\u63a7\u5236\u5668\u7684\u5904\u7406\u80fd\u529b\u4e0d\u8db3\uff0c\u53ef\u80fd\u4f1a\u5f71\u54cd\u7cfb\u7edf\u7684\u6027\u80fd\u3002<\/p>\n

\u603b\u7ed3<\/h2>\n

  DMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u662f\u4e00\u79cd\u63d0\u9ad8\u8ba1\u7b97\u673a\u7cfb\u7edf\u6027\u80fd\u7684\u6709\u6548\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u5c06\u5b57\u7b26\u8bbe\u5907\u7684\u4e2d\u65ad\u5904\u7406\u4ece\u4e3b\u673a\u5904\u7406\u5668\u632a\u5230\u4e13\u7528\u7684DMA\u63a7\u5236\u5668\u4e0a\uff0c\u4ece\u800c\u51cf\u8f7bCPU\u7684\u8d1f\u62c5\uff0c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6027\u80fd\u3002<\/strong>\u4f46\u662f\uff0cDMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u7684\u5b9e\u73b0\u9700\u8981\u8f83\u591a\u7684\u786c\u4ef6\u8d44\u6e90\uff0c\u56e0\u6b64\u6210\u672c\u6bd4\u8f83\u9ad8\uff0c\u800c\u4e14DMA\u63a7\u5236\u5668\u672c\u8eab\u4e5f\u9700\u8981\u4e00\u5b9a\u7684\u5904\u7406\u80fd\u529b\uff0c\u5982\u679cDMA\u63a7\u5236\u5668\u7684\u5904\u7406\u80fd\u529b\u4e0d\u8db3\uff0c\u53ef\u80fd\u4f1a\u5f71\u54cd\u7cfb\u7edf\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

DMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u8ba1\u7b97\u673a\u7cfb\u7edf\u4e2d\u65ad\u5904\u7406\u673a\u5236\uff0c\u5b83\u80fd\u591f\u63d0\u9ad8\u8ba1\u7b97\u673a\u7cfb\u7edf\u7684\u6027\u80fd\uff0c\u4f7f\u5f97\u7cfb\u7edf\u80fd\u591f\u66f4\u5feb\u5730\u5904\u7406\u4e2d\u65ad\u3002\u672c\u6587\u5c06\u4ecb\u7ecdDMA\u65b9\u5f0f\u4e0b\u5b57\u7b26\u8bbe\u5907\u4e2d\u65ad\u7684\u539f\u7406\uff0c\u4ee5\u53ca\u5b83\u5728\u5b9e\u9645<\/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":[305],"class_list":["post-56553","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-dzjs"],"_links":{"self":[{"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/posts\/56553","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=56553"}],"version-history":[{"count":0,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/posts\/56553\/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=56553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/categories?post=56553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techphant.cn\/wp-json\/wp\/v2\/tags?post=56553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}