{"rsdb":{"rid":"319000","subhead":"","postdate":"0","aid":"230568","fid":"92","uid":"1","topic":"1","content":"
\n

      USB\uff08Universal Serial Bus\uff09\u5168\u79f0\u901a\u7528\u4e32\u53e3\u603b\u7ebf\uff0cUSB\u4e3a\u89e3\u51b3\u5373\u63d2\u5373\u7528\u9700\u6c42\u800c\u8bde\u751f\uff0c\u652f\u6301\u70ed\u63d2\u62d4\u3002USB\u534f\u8bae\u7248\u672c\u6709USB1.0\u3001USB1.1\u3001USB2.0\u3001USB3.1\u7b49\uff0cUSB2.0\u76ee\u524d\u6bd4\u8f83\u5e38\u7528\uff0cUSB\u662f\u4e3b\u4ece\u6a21\u5f0f\u7684\u7ed3\u6784\uff0c\u8bbe\u5907\u4e0e\u8bbe\u5907\u4e4b\u95f4\u3001\u4e3b\u673a\u4e0e\u4e3b\u673a\u4e4b\u95f4\u4e0d\u80fd\u4e92\u8fde\uff0c\u4e3a\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6269\u5927USB\u7684\u5e94\u7528\u8303\u56f4\uff0c\u51fa\u73b0\u4e86USB OTG\uff0c\u5168\u62fc ON The Go\u3002USB OTG \u540c\u4e00\u4e2a\u8bbe\u5907\uff0c\u5728\u4e0d\u540c\u7684\u573a\u5408\u4e0b\u53ef\u884c\u5728\u4e3b\u673a\u548c\u4ece\u673a\u4e4b\u95f4\u5207\u6362\u3002<\/p> \n

    1\u3001USB\u7279\u70b9<\/p> \n

         USB1.0\u548cUSB1.1\u652f\u63011.5Mb\/s\u7684\u4f4e\u901f\u6a21\u5f0f\u548c12Mb\/bs\u7684\u5168\u901f\u6a21\u5f0f\u3002\u5728USB2.0\u4ee5\u4e0a\u652f\u6301480Mb\/s\u7684\u9ad8\u901f\u6a21\u5f0f\u3002 <\/p> \n

 2\u3001  \u81ea\u4f9b\u7535\u8bbe\u5907\uff1a\u8bbe\u5907\u4ece\u5916\u90e8\u7535\u6e90\u83b7\u53d6\u5de5\u4f5c\u7535\u538b \u603b\u7ebf\u4f9b\u7535\u8bbe\u5907\uff1a\u8bbe\u5907\u4eceVBUS(5v) \u53d6\u7535 \u3002\u5bf9\u603b\u7ebf\u4f9b\u7535\u8bbe\u5907\uff0c\u533a\u5206\u4f4e\u529f\u8017\u548c\u9ad8\u529f\u8017USB\u8bbe\u5907 <\/p> \n

\u4f4e\u529f\u8017\u603b\u7ebf\u4f9b\u7535\u8bbe\u5907\uff1a\u6700\u5927\u529f\u8017\u4e0d\u8d85\u8fc7100mA 
\u9ad8\u529f\u8017\u603b\u7ebf\u4f9b\u7535\u8bbe\u5907\uff1a \u679a\u4e3e\u65f6\u6700\u5927\u529f\u8017\u4e0d\u8d85\u8fc7100mA\uff0c\u679a\u4e3e\u5b8c\u6210\u914d\u7f6e\u7ed3\u675f\u540e\u529f\u8017\u4e0d\u8d85\u8fc7500mA 
\u8bbe\u5907\u5728\u679a\u4e3e\u8fc7\u7a0b\u4e2d\uff0c\u901a\u8fc7\u8bbe\u5907\u7684\u914d\u7f6e\u63cf\u8ff0\u7b26\u5411\u4e3b\u673a\u62a5\u544a\u5b83\u7684\u4f9b\u7535\u914d\u7f6e\uff08\u81ea\u4f9b\u7535\/\u603b\u7ebf\u4f9b\u7535\uff09\u4ee5\u53ca\u5b83\u7684\u529f\u8017\u8981\u6c42<\/p> \n

3\u3001 USB\u603b\u7ebf\u4fe1\u53f7:
        USB\u4f7f\u7528\u7684\u662f\u5dee\u5206\u4f20\u8f93\u6a21\u5f0f\uff0c\u4e24\u4e2a\u6570\u636e\u7ebfD+\u548cD- \"\"
        \u5dee\u5206\u4fe1\u53f71\uff1aD+ > VOH(min) (2.8V) \u4e14D- < VOL(max)(0.3V) 
        \u5dee\u5206\u4fe1\u53f70\uff1aD- > VOH and D+ < VOL  <\/p> \n

\u603b\u6709\u4ee5\u4e0b\u4e2a\u72b6\u6001\uff0c<\/p> \n

J\u72b6\u6001\uff08\u9ad8\u7535\u5e73\uff09\uff1aD+ \u9ad8\uff0cD- \u4f4e
K\u72b6\u6001\uff08\u4f4e\u7535\u5e73\uff09\uff1aD+\u4f4e\uff0cD- \u9ad8
SEO\u72b6\u6001\uff1aD+ \u4f4e\uff0cD- \u9ad8
Reset\u4fe1\u53f7\uff1aD+ and D- < VOL for >= 10ms 
\u4e3b\u673a\u5728\u8981\u548c\u8bbe\u5907\u901a\u4fe1\u4e4b\u524d\u4f1a\u53d1\u9001Reset\u4fe1\u53f7\u6765\u628a\u8bbe\u5907\u8bbe\u7f6e\u5230\u9ed8\u8ba4\u7684\u672a\u914d\u7f6e\u72b6\u6001\u3002\u5373\u4e3b\u673a\u62c9\u4f4e\u4e24\u6839\u4fe1\u53f7\u7ebf\uff08SE0\u72b6\u6001\uff09
\u5e76\u4fdd\u630110ms 
Idle\u72b6\u6001\uff1aJ\u72b6\u6001\u6570\u636e\u53d1\u3001\u9001\u524d\u540e\u603b\u7ebf\u7684\u72b6\u6001 
Suspend\u72b6\u6001\uff1a3ms\u4ee5\u4e0a\u7684J\u72b6\u6001 <\/p> \n

                               SYNC\uff1a 3\u4e2aKJ\u72b6\u6001\u5207\u6362\uff0c\u540e\u8ddf\u968f2\u4f4d\u65f6\u95f4\u7684K\u72b6\u6001<\/p> \n

Resume\u4fe1\u53f7\uff1a20ms\u7684K\u72b6\u6001+\u4f4e\u901fEOP 
\u4e3b\u673a\u5728\u6302\u8d77\u8bbe\u5907\u540e\u53ef\u901a\u8fc7\u7ffb\u8f6c\u6570\u636e\u7ebf\u4e0a\u7684\u6781\u6027\u5e76\u4fdd\u630120ms\u6765\u5524\u9192\u8bbe\u5907\uff0c\u5e76\u4ee5\u4f4e\u901fEOP\u4fe1\u53f7\u7ed3\u5c3e 
\u5e26\u8fdc\u7a0b\u5524\u9192\u529f\u80fd\u7684\u8bbe\u5907\u8fd8\u53ef\u81ea\u5df1\u53d1\u8d77\u8be5\u5524\u9192\u4fe1\u53f7\uff1b\u524d\u63d0\u662f\u8bbe\u5907\u5df2\u8fdb\u5165idle\u72b6\u6001\u81f3\u5c115ms\uff0c\u7136\u540e\u53d1\u51fa\u5524\u9192K\u4fe1\u53f7\uff0c\u7ef4\u63011ms\u523015ms\u5e76\u7531\u4e3b\u673a\u57281ms\u5185\u63a5\u7ba1\u6765\u7ee7\u7eed\u9a71\u52a8\u5524\u9192\u4fe1\u53f7 
SOP\uff1a\u4eceIDLE\u72b6\u6001\u5207\u6362\u5230K\u72b6\u6001 
EOP\uff1a\u6301\u7eed2\u4f4d\u65f6\u95f4\u7684SE0\u4fe1\u53f7\uff0c\u540e\u8ddf\u968f1\u4f4d\u65f6\u95f4\u7684J\u72b6\u6001 
Keep alive\u5373\u4f4e\u901fEOP\u4fe1\u53f7<\/p> \n

\"\"\u5524\u9192slave\u8bbe\u5907\u64cd\u4f5c<\/p> \n

4\u3001USB\u63d2\u5165\u68c0\u6d4b\u548c\u901f\u5ea6\u68c0\u6d4b<\/p> \n

     \u5168\u901f\u9ad8\u901f\u8bbe\u5907\u5728D+\u63a5\u4e0a\u62c91.5k\u7535\u963b\uff0c\u4f4e\u901f\u8bbe\u5907\u5728D-\u63a5\u4e0a\u62c91.5K\u7535\u963b\u3002\u4e3b\u673a\u68c0\u6d4b\u5230\u67d0\u4e00\u4e2a\u6570\u636e\u7ebf\u7535\u5e73\u62c9\u9ad8\u5e76\u4fdd\u6301\u4e86\u4e00\u6bb5\u65f6\u95f4\uff0c\u5c31\u8ba4\u4e3a\u6709\u8bbe\u5907\u8fde\u4e0a\u6765\u4e86\uff0c \u5148\u628a\u9ad8\u901f\u8bbe\u5907\u68c0\u6d4b\u4e3a\u5168\u901f\u8bbe\u5907\uff0c\u7136\u540e\u518d\u901a\u8fc7\u201cChirp\u5e8f\u5217\u201d\u7684\u603b\u7ebf\u63e1\u624b\u673a\u5236\u6765\u8bc6\u522b\u9ad8\u901f\u548c\u5168\u901f\u8bbe\u5907\u3002\u4e3b\u673a\u5fc5\u9700\u5728\u9a71\u52a8SE0\u72b6\u6001\u4ee5\u590d\u4f4d\u8bbe\u5907\u4e4b\u524d\uff0c\u7acb\u523b\u91c7\u6837\u603b\u7ebf\u72b6\u6001\u6765\u5224\u65ad\u8bbe\u5907\u7684\u901f\u5ea6 \u3002<\/p> \n

    D+\u548cD-\u6570\u636e\u7ebf\u4e0a\u7684\u4e0b\u62c9\u7535\u963b\u8d77\u4f5c\u7528\uff0c\u4f7f\u5f97\u4e8c\u8005\u90fd\u5728\u4f4e\u7535\u5e73\uff1b\u4e3b\u673a\u7aef\u770b\u6765\u5c31\u662f\u4e2aSE0\u72b6\u6001\uff1b\u540c\u6837\u5730\uff0c\u5f53\u6570\u636e\u7ebf\u4e0a\u7684SE0\u72b6\u6001\u6301\u7eed\u4e00\u6bb5\u65f6\u95f4\u4e86\uff0c\u5c31\u88ab\u4e3b\u673a\u8ba4\u4e3a\u662f\u65ad\u5f00\u72b6\u6001\u3002<\/p> \n

5\u3001USB\u4f20\u8f93<\/p> \n

     \u4e00\u4e2a\u4f20\u8f93\u6709\u591a\u4e2a\u4e8b\u52a1\u7ec4\u6210\uff0c\u4e00\u4e2a\u4e8b\u52a1\u75312\u52303\u4e2a\u5305\u7ec4\u6210\u3002\u4f20\u8f93\u53c8\u5206\u4e3a\u56db\u79cd\u7c7b\u578b\uff1a\u6279\u91cf\u4f20\u8f93\u3001\u7b49\u65f6(\u540c\u6b65)\u4f20\u8f93\u3001\u4e2d\u65ad\u4f20\u8f93\u3001\u63a7\u5236\u4f20\u8f93\u3002\u6ce8\u610f\uff1aUSB\u4f20\u8f93\u6570\u636e\u5148\u53d1\u6570\u636e\u4f4e\u4f4d\u518d\u53d1\u9ad8\u4f4d\u6570\u636e\u3002<\/p> \n

   USB\u534f\u8bae\u5b9a\u4e49\u4e86\u56db\u79cd\u4f20\u8f93\u7c7b\u578b\uff1a <\/strong>
\u6279\u91cf(\u5927\u5bb9\u91cf\u6570\u636e)\u4f20\u8f93<\/span>(Bulk Transfers): \u975e\u5468\u671f\u6027\uff0c\u7a81\u53d1  <\/strong>
\u5927\u5bb9\u91cf\u6570\u636e\u7684\u901a\u4fe1\uff0c\u6570\u636e\u53ef\u4ee5\u5360\u7528\u4efb\u610f\u5e26\u5bbd\uff0c\u5e76\u5bb9\u5fcd\u5ef6\u8fdf \u3002\u5982USB\u6253\u5370\u673a\u3001\u626b\u63cf\u4eea\u3001\u5927\u5bb9\u91cf\u50a8\u5b58\u8bbe\u5907\u7b49 <\/strong><\/p> \n

\u4f4e\u901f USB \u8bbe\u5907\u4e0d\u652f\u6301\u6279\u91cf\u4f20\u8f93\uff0c\u9ad8\u901f\u6279\u91cf\u7aef\u70b9\u7684\u6700\u5927\u5305\u957f\u5ea6\u4e3a 512\uff0c\u5168\u901f\u6279\u91cf\u7aef\u70b9\u7684\u6700\u5927\u5305\u957f\u5ea6\u53ef\u4ee5\u4e3a 8\u300116\u300132\u300164\u3002<\/p> \n

      \u6279\u91cf\u4f20\u8f93\u5728\u8bbf\u95ee USB \u603b\u7ebf\u65f6\uff0c\u76f8\u5bf9\u5176\u4ed6\u4f20\u8f93\u7c7b\u578b\u5177\u6709\u6700\u4f4e\u7684\u4f18\u5148\u7ea7\uff0cUSB HOST \u603b\u662f\u4f18\u5148\u5b89\u6392\u5176\u4ed6\u7c7b\u578b\u7684\u4f20\u8f93\uff0c\u5f53\u603b\u7ebf\u5e26\u5bbd\u6709\u5bcc\u4f59\u65f6\u624d\u5b89\u6392\u6279\u91cf\u4f20\u8f93\u3002<\/p> \n

      \u9ad8\u901f\u7684\u6279\u91cf\u7aef\u70b9\u5fc5\u987b\u652f\u6301PING \u64cd\u4f5c\uff0c\u5411\u4e3b\u673a\u62a5\u544a\u7aef\u70b9\u7684\u72b6\u6001\uff0cNYET \u8868\u793a\u5426\u5b9a\u5e94\u7b54\uff0c\u6ca1\u6709\u51c6\u5907\u597d\u63a5\u6536\u4e0b\u4e00\u4e2a\u6570\u636e\u5305\uff0cACK \u8868\u793a\u80af\u5b9a\u5e94\u7b54\uff0c\u5df2\u7ecf\u51c6\u5907\u597d\u63a5\u6536\u4e0b\u4e00\u4e2a\u6570\u636e\u5305\u3002<\/p> \n


\u4e2d\u65ad\u4f20\u8f93(Interrupt Transfers):<\/span> \u5468\u671f\u6027\uff0c\u4f4e\u9891\u7387<\/strong>
\u5141\u8bb8\u6709\u9650\u5ef6\u8fdf\u7684\u901a\u4fe1 \u5982\u4eba\u673a\u63a5\u53e3\u8bbe\u5907\uff08HID\uff09\u4e2d\u7684\u9f20\u6807\u3001\u952e\u76d8\u3001\u8f68\u8ff9\u7403\u7b49<\/strong><\/p> \n

\u4e2d\u65ad\u4f20\u8f93\u662f\u4e00\u79cd\u4fdd\u8bc1\u67e5\u8be2\u9891\u7387\u7684\u4f20\u8f93\u3002\u4e2d\u65ad\u7aef\u70b9\u5728\u7aef\u70b9\u63cf\u8ff0\u7b26\u4e2d\u8981\u62a5\u544a\u5b83\u7684\u67e5\u8be2\u95f4\u9694\uff0c\u4e3b\u673a\u4f1a\u4fdd\u8bc1\u5728\u5c0f\u4e8e
\u8fd9\u4e2a\u65f6\u95f4\u95f4\u9694\u7684\u8303\u56f4\u5185\u5b89\u6392\u4e00\u6b21\u4f20\u8f93\u3002<\/p> \n

\u4e2d\u65ad\u4f20\u8f93\u662f\u4e00\u79cd\u8f6e\u8be2\u7684\u4f20\u8f93\u65b9\u5f0f\uff0c\u662f\u4e00\u79cd\u5355\u5411\u7684\u4f20\u8f93\uff0cHOST\u901a\u8fc7\u56fa\u5b9a\u7684\u95f4\u9694\u5bf9\u4e2d\u65ad\u7aef\u70b9\u8fdb\u884c\u67e5\u8be2\uff0c\u82e5\u6709\u6570\u636e\u4f20\u8f93\u6216\u53ef\u4ee5\u63a5\u6536\u6570\u636e\u5219\u8fd4\u56de\u6570\u636e\u6216\u53d1\u9001\u6570\u636e\uff0c\u5426\u5219\u8fd4\u56deNAK\uff0c\u8868\u793a\u5c1a\u672a\u51c6\u5907\u597d\u3002<\/p> \n

      \u4e2d\u65ad\u4f20\u8f93\u7684\u5ef6\u8fdf\u6709\u4fdd\u8bc1\uff0c\u4f46\u5e76\u975e\u5b9e\u65f6\u4f20\u8f93\uff0c\u5b83\u662f\u4e00\u79cd\u5ef6\u8fdf\u6709\u9650\u7684\u53ef\u9760\u4f20\u8f93\uff0c\u652f\u6301\u9519\u8bef\u91cd\u4f20\u3002 
      \u5bf9\u4e8e\u9ad8\u901f\/\u5168\u901f\/\u4f4e\u901f\u7aef\u70b9\uff0c\u6700\u5927\u5305\u957f\u5ea6\u5206\u522b\u53ef\u4ee5\u8fbe\u52301024\/64\/8 Bytes\u3002<\/p> \n

      \u9ad8\u901f\u4e2d\u65ad\u4f20\u8f93\u4e0d\u5f97\u5360\u7528\u8d85\u8fc7 80%\u7684\u5fae\u5e27\u65f6\u95f4\uff0c\u5168\u901f\u548c\u4f4e\u901f\u4e0d\u5f97\u8d85\u8fc7 90%\u3002<\/p> \n

      \u4e2d\u65ad\u7aef\u70b9\u7684\u8f6e\u8be2\u95f4\u9694\u7531\u5728\u7aef\u70b9\u63cf\u8ff0\u7b26\u4e2d\u5b9a\u4e49\uff0c\u5168\u901f\u7aef\u70b9\u7684\u8f6e\u8be2\u95f4\u9694\u53ef\u4ee5\u662f1~255mS\uff0c\u4f4e\u901f\u7aef\u70b9\u4e3a10~255mS\uff0c\u9ad8\u901f\u7aef\u70b9\u4e3a(2interval-1)*125uS\uff0c\u5176\u4e2d interval\u53d6 1\u5230 16\u4e4b\u95f4\u7684\u503c\u3002<\/p> \n

      \u9664\u9ad8\u901f\u9ad8\u5e26\u5bbd\u4e2d\u65ad\u7aef\u70b9\u5916\uff0c\u4e00\u4e2a\u5fae\u5e27\u5185\u4ec5\u5141\u8bb8\u4e00\u6b21\u4e2d\u65ad\u4e8b\u52a1\u4f20\u8f93\uff0c\u9ad8\u901f\u9ad8\u5e26\u5bbd\u7aef\u70b9\u6700\u591a\u53ef\u4ee5\u5728\u4e00\u4e2a\u5fae\u5e27\u5185\u8fdb\u884c\u4e09\u6b21\u4e2d\u65ad\u4e8b\u52a1\u4f20\u8f93\uff0c\u4f20\u8f93\u9ad8\u8fbe 3072 \u5b57\u8282\u7684\u6570\u636e\u3002<\/p> \n

      \u6240\u8c13\u5355\u5411\u4f20\u8f93\uff0c\u5e76\u4e0d\u662f\u8bf4\u8be5\u4f20\u8f93\u53ea\u652f\u6301\u4e00\u4e2a\u65b9\u5411\u7684\u4f20\u8f93\uff0c\u800c\u662f\u6307\u5728\u67d0\u4e2a\u7aef\u70b9\u4e0a\u8be5\u4f20\u8f93\u4ec5\u652f\u6301\u4e00\u4e2a\u65b9\u5411\uff0c\u6216\u8f93\u51fa\uff0c\u6216\u8f93\u5165\u3002\u5982\u679c\u9700\u8981\u5728\u4e24\u4e2a\u65b9\u5411\u4e0a\u8fdb\u884c\u67d0\u79cd\u5355\u5411\u4f20\u8f93\uff0c\u9700\u8981\u5360\u7528\u4e24\u4e2a\u7aef\u70b9\uff0c<\/p> \n

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