{"id":1511,"date":"2025-01-01T08:32:07","date_gmt":"2025-01-01T00:32:07","guid":{"rendered":"https:\/\/aoofoo.com\/?p=1511"},"modified":"2025-01-01T17:50:48","modified_gmt":"2025-01-01T09:50:48","slug":"6-2-mac%e5%86%85%e6%a0%b8%e7%ae%80%e4%bb%8b","status":"publish","type":"post","link":"https:\/\/aoofoo.com\/index.php\/2025\/01\/01\/6-2-mac%e5%86%85%e6%a0%b8%e7%ae%80%e4%bb%8b\/","title":{"rendered":"6.2 MAC\u5185\u6838\u7b80\u4ecb"},"content":{"rendered":"

MAC\u7b80\u4ecb<\/h2>\n

\u6211\u4eec\u77e5\u9053TCP\/IP\u7684\u534f\u8bae\u6808\u7ed3\u6784\u6709\u5e94\u7528\u5c42\u3001\u4f20\u8f93\u5c42\u3001\u7f51\u7edc\u5c42\u548c\u94fe\u8def\u5c42\u3002<\/p>\n

\u5176\u4e2d\u94fe\u8def\u5c42\u53c8\u53ef\u4ee5\u5206\u4e3a\u6570\u636e\u94fe\u8def\u5c42<\/strong><\/span>\u548c\u7269\u7406\u5c42\u3002<\/p>\n

\u90a3\u4e48\u8fd9\u91cc\u7684\u6570\u636e\u94fe\u8def\u5c42\u5c31\u662fMAC\u5185\u6838\u6240\u4f5c\u7528\u7684\u5730\u65b9\u4e86\u3002<\/p>\n

STM32\u81ea\u5e26\u670910\/100Mbit\/s\u7684\u4ee5\u592a\u7f51MAC\u5185\u6838\uff0c\u5b83\u63d0\u4f9b\u5730\u5740\u53ca\u5a92\u4f53\u8bbf\u95ee\u7684\u63a7\u5236\u65b9\u5f0f\u3002<\/p>\n

MAC\u5185\u6838\u7279\u6027<\/h2>\n

\"\"<\/p>\n

ST\u7684ETH(\u4ee5\u592a\u7f51)\u6846\u67b6<\/h2>\n

\"\"<\/p>\n

\u6bd4\u5982\u53d1\u9001\u4e00\u4e2a\u6570\u636e\uff0c\u7f51\u7edc\u5c42\u4e0b\u8fbe\u4e00\u4e2a\u6570\u636e\u5305\uff0c\u7ecf\u8fc7\u4ee5\u592a\u7f51DMA\u8f6c\u53d1\u5230TX FIFO\u4e2d\uff08\u5b58\u50a8\u5668\u5230\u5b58\u50a8\u5668\uff09\uff0c\u7136\u540e\u7ecf\u8fc7MAC\u5185\u6838\u5229\u7528RMII\u63a5\u53e3\u8f6c\u53d1\u5230PHY\u5916\u8bbe\u4e2d\u8f6c\u53d8\u6210\u5149\u4fe1\u53f7\u548c\u7535\u4fe1\u53f7\u53d1\u9001\u5230\u7f51\u7edc\u4e2d\u3002<\/p>\n

\u6bd4\u5982\u63a5\u6536\u4e00\u4e2a\u6570\u636e\u5305\uff0c\u7c7b\u4f3c\u7684\uff0cPHY\u63a5\u6536\u5230\u4e86\u5149\u7535\u7684\u6a21\u62df\u4fe1\u53f7\uff0c\u7136\u540e\u5229\u7528RMII\u63a5\u53e3\u53d1\u9001\u5230MAC\u5185\u6838\u5904\u7406\uff0c\u7136\u540e\u8f6c\u53d1\u5230RX FIFO\u4e2d\uff0cRX FIFO\u5229\u7528\u4ee5\u592a\u7f51DMA\u8f6c\u53d1\u81f3\u7f51\u7edc\u4e2d\u3002<\/p>\n

\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cRX FIFO \u548c TX FIFO\u90fd\u662f2KB\u7684\uff0c\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f\u6211\u4eec\u7684\u4ee5\u592a\u7f51\u5e27\u4e0d\u80fd\u8d85\u8fc71500\u5b57\u8282\uff081.4KB\uff09\uff0c\u6240\u4ee52KB\u5df2\u7ecf\u8db3\u591f\u4e86\u3002<\/p>\n

\u4ee5\u592a\u7f51DMA\u6570\u636e\u5305\u4ee5DMA\u65b9\u5f0f\u53d1\u9001\/\u63a5\u6536\uff0cMAC\u5185\u6838\u4ee5\u592a\u7f51\u5e27\u53d1\u9001\u65f6\uff0c\u7ed9\u6570\u636e\u52a0\u4e0a\u4e00\u4e9b\u63a7\u5236\u4fe1\u606f\uff1b\u4ee5\u592a\u7f51\u5e27\u63a5\u6536\u65f6\uff0c\u53bb\u6389\u63a7\u5236\u4fe1\u606f\u3002<\/p>\n

PHY\u4ea4\u4e92\u63a5\u53e3\uff0c\u6709\u6570\u636e\u901a\u9053\u548c\u7ba1\u7406\u901a\u9053\uff0c\u6570\u636e\u901a\u9053\u662f\u4ecb\u8d28\u63a5\u53e3RMII\/MII\uff0c\u7ba1\u7406\u901a\u9053\u662fSMI\u7ad9\u7ba1\u7406\u63a5\u53e3\u3002<\/p>\n

SMI\u7ad9\u7ba1\u7406\u63a5\u53e3<\/h2>\n

\"\"<\/p>\n

\u5141\u8bb8\u5e94\u7528\u7a0b\u5e8f\u901a\u8fc7\u65f6\u949f\u7ebf\u548c\u6570\u636e\u7ebf\u8bbf\u95ee\u4efb\u610fPHY\u5bc4\u5b58\u5668\uff0c\u6700\u591a\u652f\u630132\u4e2aPHY\u8bbf\u95ee\u3002\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u7684STM32\u5185\u5d4c\u7684\u4e00\u4e2aMAC\u5185\u6838\u4ed6\u53ef\u4ee5\u7ba1\u740632\u4e2aPHY\u82af\u7247\u3002<\/p>\n

MDC\uff1a\u5468\u671f\u65f6\u949f\u5f15\u811a\uff08\u6700\u5927\u9891\u7387\u4e3a\uff1a2.5MHz\uff09<\/p>\n

MDIO\uff1a\u6570\u636e\u8f93\u5165\/\u8f93\u51fa\u6bd4\u7279\u6d41\u3002<\/p>\n

\"\"<\/p>\n

\u8bfb\u53d6\u548c\u5199\u5165\u7684\u5305\u5934\u548c\u8d77\u59cb\u90fd\u662f\u4e00\u6837\u7684\uff0c\u64cd\u4f5c\u4e0d\u4e00\u6837\uff0c\u4e00\u4e2a10\u4e00\u4e2a01.<\/p>\n

PADDR\u5c31\u662fPHY\u7684\u5730\u5740\uff0c\u6211\u4eec\u7684SMI\u7ad9\u7ba1\u7406\u63a5\u53e3\u53ef\u4ee5\u7ba1\u7406\u591a\u4e2aPHY\u82af\u7247\uff0c\u5982\u4f55\u53bb\u7ba1\u7406\u7684\u5462\uff1f\u5c31\u662f\u901a\u8fc7PADDR\u4e0d\u540c\u7684PHY\u5730\u5740\u8fdb\u884c\u7ba1\u7406\uff0c\u6bcf\u4e00\u4e2aPHY\u82af\u7247\u5bf9\u5e94\u4e86\u552f\u4e00\u7684\u4e00\u4e2aPHY\u5730\u5740\u3002<\/p>\n

RADDR\u5c31\u662f\u5bc4\u5b58\u5668\u5730\u5740\uff0c\u662fPHY\u8bbe\u5907\u91cc\u9762\u7684\u5bc4\u5b58\u5668\u5730\u5740\uff0c\u53ef\u4ee5\u8fdb\u884c\u5bf9\u5e94\u7684\u8bfb\u53d6\u548c\u5199\u5165\u3002<\/p>\n

\u6570\u636e\u4f4d\u5c31\u662fPHY\u7684\u5bc4\u5b58\u5668\uff0cPHY\u768432\u4e2a\u5bc4\u5b58\u5668\u90fd\u662f16\u4f4d\u7684\u3002<\/p>\n

MDC\u7684\u65f6\u949f\u6765\u6e90\u662f\u4ec0\u4e48\u5462\uff1fMDC\u65f6\u949f\u6765\u81eaAHB\u65f6\u949f\u6811\u5206\u9891\u5f97\u6765\u7684\u3002<\/p>\n

\u4ecb\u8d28\u63a5\u53e3MII\u3001RMII<\/h2>\n

\u6211\u4eecMAC\u5185\u6838\u7684\u4ee5\u592a\u7f51\u5e27\u5982\u4f55\u8f6c\u6362\u5230PHY\u5f53\u4e2d\u5462\uff1f<\/p>\n

\u8fd9\u5c31\u9700\u8981\u4ecb\u8d28\u63a5\u53e3MII\u6216RMII\u4e86\uff0c\u6211\u4eec\u4e00\u822c\u539f\u5219\u4e0a\u4f7f\u7528RMII\u901a\u9053\u8fdb\u884c\u8f6c\u6362\uff0c\u800c\u4e0d\u4f7f\u7528MII\uff0c\u901a\u8fc7RMII\u901a\u9053\u8f6c\u53d1\u5230PHY\u5f53\u4e2d\uff0cPHY\u518d\u5c06\u4fe1\u53f7\u8f6c\u6362\u4e3a\u5149\u7535\u4fe1\u53f7\u81f3\u7f51\u7edc\u5f53\u4e2d\u3002<\/p>\n

\"\"<\/p>\n

\u90a3\u4e48MII\u548cRMII\u6709\u4ec0\u4e48\u5f02\u540c\u5462\uff1f\u4e3a\u4ec0\u4e48\u539f\u5219\u4e0a\u8981\u4f7f\u7528RMII\u5462\uff1f<\/p>\n

\u5982\u679c\u6211\u4eec\u9009\u62e9\u7684\u662fMII\uff0c\u90a3\u4e48\u5f15\u811a\u6570\u91cf\u4f1a\u662f16\u4e2aIO\uff0c\u5982\u679c\u662fRMII\uff0c\u5f15\u811a\u6570\u91cf\u662f9\u4e2aIO\u3002<\/p>\n

\u5982\u679c\u6211\u4eec\u9009\u62e9\u7684\u662fMII\uff0c\u90a3\u4e48\u53c2\u8003\u65f6\u949f\u4f1a\u662f25MHz\uff0c\u5982\u679c\u662fRMII\uff0c\u53c2\u8003\u65f6\u949f\u662f50MHz\u3002<\/p>\n

\u5982\u679c\u6211\u4eec\u9009\u62e9\u7684\u662fMII\uff0c\u90a3\u4e48\u6536\u53d1\u7684\u4f4d\u5bbd\u4f1a\u662f4\u4f4d\/\u5468\u671f\uff0c\u5982\u679c\u662fRMII\uff0c\u6536\u53d1\u7684\u4f4d\u5bbd\u662f2\u4f4d\/\u5468\u671f\u3002<\/p>\n

\"\"<\/p>\n

MII\u4ecb\u8d28\u63a5\u53e3\u6240\u9700\u8981\u5f15\u811a\u6570\u91cf\u4e3a16\u4e2a\uff0c\u800cRMII\u63a5\u53e3\u6240\u9700\u8981\u7684\u5f15\u811a\u6570\u91cf\u4e3a9\u4e2a\u3002<\/p>\n

MII\u4ecb\u8d28\u63a5\u53e3\u7684TX_CLK\u548cRX_CLK\u7531PHY\u82af\u7247\u63d0\u4f9b\uff0c\u5b83\u4eec\u4f1a\u8ba9MAC\u5185\u6838\u4ee5\u8fd9\u4e2a\u65f6\u949f\u91c7\u96c6\u6536\u53d1\u6570\u636e\uff0c\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u7684\u4f20\u8f93\u6570\u636e\u65f610M bit\/s\uff0c\u90a3\u4e48TX_CLK\u548cRX_CLK\u7684\u9891\u7387\u4f1a\u662f2.5MHz\u3002\u56e0\u4e3aMII\u4f4d\u5bbd\u662f4\u4f4d\uff0c\u6240\u4ee52.5MHz\u7684\u65f6\u949f\u9891\u7387\u5bf9\u5e9410M bit\/s\u3002<\/p>\n

RMII\u4ecb\u8d28\u63a5\u53e3\u7684REF_CLK\uff0c MAC\u5185\u6838\u4ee5\u8fd9\u4e2a\u65f6\u949f\u91c7\u96c6\u6536\u53d1\u6570\u636e<\/p>\n

\u6ce8\u610f\uff1aRX_ER\u548cRX_DV\u662f\u7528\u6765\u68c0\u6d4b\u4ee5\u592a\u7f51\u5e27\u662f\u5426\u6709\u6548\u6027\uff0c\u800cCRS\u548cCOL\u4ee5\u53caCRS_DV\u5728\u5168\u53cc\u5de5\u6a21\u5f0f\u4e0b\u65e0\u6548<\/p>\n

\"\"<\/p>\n

\u4ecb\u8d28MII\u7684\u53c2\u8003\u65f6\u949f\u6765\u6e90\u6709\u4e24\u4e2a\uff1aMCO\u8f93\u51fa25MHz\u4ee5\u53ca\u5916\u90e8\u6676\u632f\u8f93\u51fa25MHz<\/p>\n

\u4ecb\u8d28RMII\u7684\u53c2\u8003\u65f6\u949f\u6765\u6e90\u6709\u4e24\u4e2a\uff1aMCO\u7ecf\u8fc7\u500d\u9891PLL\u8f93\u51fa50MHz\u4ee5\u53ca\u5916\u90e8\u6676\u632f\u8f93\u51fa50MHz(\u5fc5\u987b\u540c\u65f6\u63d0\u4f9bPHY\u548cMAC)<\/p>\n

\u6ce8\u610f\uff1aMII\u63a5\u53e3\u4e2d\u7684TX_CLK\u548cRX_CLK\u65f6\u949f\u662f\u6839\u636e\u6570\u636e\u4f20\u8f93\u901f\u7387\u6302\u94a9\uff0c10Mbit\/s\uff1a2.5MHz\uff1b100Mbit\/s\uff1a25MHz<\/p>\n

\"\"<\/p>\n

\u4ecb\u8d28MII\u63a5\u53e3\u4e00\u4e2a\u5468\u671f\u6536\u53d1\u4f4d\u5bbd\u4e3a4\u4f4d\u6570\u636e\uff0c\u800c\u63a5\u53e3\u4e00\u4e2a\u5468\u671fRMII\u6536\u53d1\u4f4d\u5bbd\u4e3a2\u4f4d\u6570\u636e<\/p>\n

\u65e2\u7136RMII\u4f4d\u5bbd\u53d8\u5c0f\u4e86\uff0c\u662f\u4e0d\u662fRMII\u6bd4MII\u6536\u53d1\u901f\u7387\u53d8\u6162\u4e86\uff1f<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

MAC\u7b80\u4ecb \u6211\u4eec\u77e5\u9053TCP\/IP\u7684\u534f\u8bae\u6808\u7ed3\u6784\u6709\u5e94\u7528\u5c42\u3001\u4f20\u8f93\u5c42\u3001\u7f51\u7edc\u5c42\u548c\u94fe\u8def\u5c42\u3002 \u5176\u4e2d\u94fe\u8def\u5c42\u53c8\u53ef\u4ee5\u5206\u4e3a\u6570\u636e\u94fe\u8def\u5c42 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-1511","post","type-post","status-publish","format-standard","hentry","category-lwip"],"_links":{"self":[{"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/posts\/1511","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/comments?post=1511"}],"version-history":[{"count":3,"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/posts\/1511\/revisions"}],"predecessor-version":[{"id":1523,"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/posts\/1511\/revisions\/1523"}],"wp:attachment":[{"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/media?parent=1511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/categories?post=1511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aoofoo.com\/index.php\/wp-json\/wp\/v2\/tags?post=1511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}