{"id":1069,"date":"2013-03-14T10:11:43","date_gmt":"2013-03-14T02:11:43","guid":{"rendered":"http:\/\/kaoru.tech\/?p=1069"},"modified":"2013-03-14T10:11:43","modified_gmt":"2013-03-14T02:11:43","slug":"ddr%e8%ae%be%e8%ae%a1","status":"publish","type":"post","link":"http:\/\/kaoru.tech:7000\/wordpress\/?p=1069","title":{"rendered":"DDR\u8bbe\u8ba1"},"content":{"rendered":"<h2>AT91SAM9G25 DDR2\u5e03\u7ebf\u89c4\u5219<\/h2>\n<ol>\n<li>\u9996\u5148\uff0cDDR\u79bbCPU\u8d8a\u8fd1\u8d8a\u597d\u3002\u5f88\u957f\u7684\u8d70\u7ebf\u4f1a\u589e\u52a0\u4fe1\u53f7\u7684\u4e0a\u5347\u65f6\u95f4\u548c\u4e0b\u964d\u65f6\u95f4\u3002CPU\u53d1\u8d77\u7684\u4fe1\u53f7\u5efa\u7acb\u65f6\u95f4\u4e5f\u4f1a\u56e0\u4e3a\u8d70\u7ebf\u957f\u5ea6\u7684\u589e\u52a0\u800c\u51cf\u5c0f<\/li>\n<li>\u4fdd\u8bc1DDR\u7684\u65f6\u949f\u548c\u63a7\u5236\u7ebf\u8d8a\u77ed\u8d8a\u597d<\/li>\n<li>\u4fdd\u8bc1DDR\u7684\u5730\u5740\u548c\u6570\u636e\u7ebf\u8d8a\u77ed\u8d8a\u597d<\/li>\n<li>\u5bf9\u4e8e\u5de5\u4f5c\u5728133MHz\u7684DDR2\uff0c\u7ebf\u4e0a\u7684\u963b\u6297\u5339\u914d\u662f\u5fc5\u987b\u7684\u300210\uff0d30\u03a9\u7684\u4e32\u8054\u7535\u963b\u53ef\u4ee5\u653e\u7f6e\u5728\u6240\u6709\u7684\u8f6c\u6362\u4fe1\u53f7\u4ee5\u9650\u5236\u8fc7\u6d41\u3002\u8fd9\u4e2a\u7535\u963b\u9700\u8981\u9760\u8fd1CPU\u653e\u7f6e\u3002\u662f\u5426\u9700\u8981\u7ec8\u7aef\u7535\u963b\u4ee5\u53ca\u5b83\u7684\u7279\u6027\u6700\u597d\u4f7f\u7528\u4eff\u771f\u6765\u51b3\u5b9a\uff0c\u4f7f\u7528IBIS\u6a21\u578b\u548c\u7279\u5b9a\u7684PCB layout\u3002\u5728SAM9G25\u4e0a\uff0c\u91c7\u7528\u7684\u662f27\u03a9\u7684\u4e32\u8054\u7535\u963b\u3002<\/li>\n<li>\u4e3a\u652f\u6301\u6700\u5927\u901f\u5ea6\uff0c\u5fc5\u987b\u9075\u5b88\u5408\u7406\u7684DDR2\u8d1f\u8f7d\u3002\u5bf9\u4e8e\u9ad8\u901f\u64cd\u4f5c\uff0c\u5730\u5740\u7ebf\u548c\u6570\u636e\u7ebf\u7684\u6700\u5927\u8d1f\u8f7d\u4e0d\u80fd\u8d85\u8fc730pF\uff0cSDCK\u548c#SDCK\u4e3a10pF\u3002\u7528\u6237\u5fc5\u987b\u8003\u8651\u63a5\u5728\u4e0d\u540c\u603b\u7ebf\u4e0a\u7684\u6240\u6709\u5668\u4ef6\uff0c\u6765\u8ba1\u7b97\u7cfb\u7edf\u7684\u603b\u8d1f\u8f7d\u3002<\/li>\n<\/ol>\n<h2>MPC8315 DDR2\u5e03\u7ebf\u89c4\u5219<\/h2>\n<ol>\n<li>\u5efa\u8bae\u7684\u5e03\u7ebf\u987a\u5e8f\uff1a1) DATA, 2) Address\/Command, 3) Control, 4) Clocks, 5) Power<\/li>\n<li>\u963b\u6297\u5339\u914d\n<ul>\n<li>\u5355\u7aef\u963b\u6297 \uff1d 50 &#8211; 60\u03a9\uff08MDQ, MDM, Address, Command, Control\uff09<\/li>\n<li>\u5dee\u5206\u963b\u6297 \uff1d 100 &#8211; 120\u03a9\uff08MDQS, #MDQS\uff09<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2>\u53c2\u8003<\/h2>\n<ul>\n<li><a href=\"http:\/\/www.atmel.com\/Images\/doc6492.pdf\">ATMEL: Implementation of DDR2 on AT91SAM9G45 Devices<\/a><\/li>\n<li><a href=\"http:\/\/cache.freescale.com\/files\/32bit\/doc\/white_paper\/DDRSDRAMWP.pdf?fpsp=1&amp;WT_TYPE=White%20Papers&amp;WT_VENDOR=FREESCALE&amp;WT_FILE_FORMAT=pdf&amp;WT_ASSET=Documentation\">Freescale: Comparison of DDRx and SDRAM<\/a><\/li>\n<li><a id=\"Link\" href=\"http:\/\/www.micron.com\/%7E\/media\/Documents\/Products\/Technical%20Note\/DRAM\/TN4720.pdf\" target=\"_blank\">Micron: DDR2 (Point-to-Point) Package Sizes and Layout Basics<\/a><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>AT91SAM9G25 DDR2\u5e03\u7ebf\u89c4\u5219 \u9996\u5148\uff0cDDR\u79bbCPU\u8d8a\u8fd1\u8d8a\u597d\u3002\u5f88\u957f\u7684\u8d70\u7ebf\u4f1a\u589e\u52a0\u4fe1\u53f7\u7684\u4e0a\u5347\u65f6\u95f4\u548c\u4e0b\u964d\u65f6\u95f4\u3002CPU\u53d1\u8d77\u7684\u4fe1\u53f7\u5efa\u7acb\u65f6\u95f4\u4e5f\u4f1a\u56e0\u4e3a\u8d70\u7ebf\u957f\u5ea6\u7684\u589e\u52a0\u800c\u51cf\u5c0f \u4fdd\u8bc1DDR\u7684\u65f6\u949f\u548c\u63a7\u5236\u7ebf\u8d8a\u77ed\u8d8a\u597d \u4fdd\u8bc1DDR\u7684\u5730\u5740\u548c\u6570\u636e\u7ebf\u8d8a\u77ed\u8d8a\u597d \u5bf9\u4e8e\u5de5\u4f5c\u5728133MHz\u7684DDR2\uff0c\u7ebf\u4e0a\u7684\u963b\u6297\u5339\u914d\u662f\u5fc5\u987b\u7684\u300210\uff0d30\u03a9\u7684\u4e32\u8054\u7535\u963b\u53ef\u4ee5\u653e\u7f6e\u5728\u6240\u6709\u7684\u8f6c\u6362\u4fe1\u53f7\u4ee5\u9650\u5236\u8fc7\u6d41\u3002\u8fd9\u4e2a\u7535\u963b\u9700\u8981\u9760\u8fd1CPU\u653e\u7f6e\u3002\u662f\u5426\u9700\u8981\u7ec8\u7aef\u7535\u963b\u4ee5\u53ca\u5b83\u7684\u7279\u6027\u6700\u597d\u4f7f\u7528\u4eff\u771f\u6765\u51b3\u5b9a\uff0c\u4f7f\u7528IBIS\u6a21\u578b\u548c\u7279\u5b9a\u7684PCB layout\u3002\u5728SAM9G25\u4e0a\uff0c\u91c7\u7528\u7684\u662f27\u03a9\u7684\u4e32\u8054\u7535\u963b\u3002 \u4e3a\u652f\u6301\u6700\u5927\u901f\u5ea6\uff0c\u5fc5\u987b\u9075\u5b88\u5408\u7406\u7684DDR2\u8d1f\u8f7d\u3002\u5bf9\u4e8e\u9ad8\u901f\u64cd\u4f5c\uff0c\u5730\u5740\u7ebf\u548c\u6570\u636e\u7ebf\u7684\u6700\u5927\u8d1f\u8f7d\u4e0d\u80fd\u8d85\u8fc730pF\uff0cSDCK\u548c#SDCK\u4e3a10pF\u3002\u7528\u6237\u5fc5\u987b\u8003\u8651\u63a5\u5728\u4e0d\u540c\u603b\u7ebf\u4e0a\u7684\u6240\u6709\u5668\u4ef6\uff0c\u6765\u8ba1\u7b97\u7cfb\u7edf\u7684\u603b\u8d1f\u8f7d\u3002 MPC8315 DDR2\u5e03\u7ebf\u89c4\u5219 \u5efa\u8bae\u7684\u5e03\u7ebf\u987a\u5e8f\uff1a1) DATA, 2) Address\/Command, 3) Control, 4) Clocks, 5) Power \u963b\u6297\u5339\u914d \u5355\u7aef\u963b\u6297 \uff1d 50 &#8211; 60\u03a9\uff08MDQ, MDM, Address, Command, Control\uff09&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[151],"tags":[148,150,149],"class_list":["post-1069","post","type-post","status-publish","format-standard","hentry","category-pcb-layout-embedded","tag-ddr","tag-pcb-layout","tag-149"],"_links":{"self":[{"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1069","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1069"}],"version-history":[{"count":8,"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1069\/revisions"}],"predecessor-version":[{"id":1084,"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1069\/revisions\/1084"}],"wp:attachment":[{"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1069"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1069"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/kaoru.tech:7000\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}