{"id":4060,"date":"2024-03-30T01:38:00","date_gmt":"2024-03-29T17:38:00","guid":{"rendered":"http:\/\/www.ccwifi.cc\/blogs\/?p=4060"},"modified":"2024-03-30T01:38:00","modified_gmt":"2024-03-29T17:38:00","slug":"usb%e5%8d%8f%e8%ae%ae%e5%b1%82%e6%95%b0%e6%8d%ae%e6%a0%bc%e5%bc%8f6294","status":"publish","type":"post","link":"https:\/\/www.ccwifi.cc\/blogs\/2024\/03\/30\/usb%e5%8d%8f%e8%ae%ae%e5%b1%82%e6%95%b0%e6%8d%ae%e6%a0%bc%e5%bc%8f6294\/","title":{"rendered":"USB \u534f\u8bae\u5c42\u6570\u636e\u683c\u5f0f"},"content":{"rendered":"
\n

\u5728\u7ebfwifi\u8dd1\u5305 \u91d1\u521a\u5305\u8dd1\u5305 cap\u8dd1\u5305 hccapx ewsa\u5728\u7ebf \u5c31\u6765 \u63e1\u624b\u5305\u8dd1\u5305<\/a><\/strong><\/p>\n

\u5404\u4f4d\u597d \u53c8\u89c1\u9762\u4e86 \u6211\u662f\u66f9\u64cd \u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u65b0\u7684\u6559\u7a0b<\/p>\n

\u5e0c\u671b\u5404\u4f4d\u7ec6\u5fc3\u5b66\u4e60 \u4f4e\u8c03\u7528\u7f51<\/p>\n<\/div>\n

\"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"\"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"\"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"\"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"<\/p>\n

    \n
  1. \n

    \u5728\u8f6f\u4ef6\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5ffd\u7565 Hub \u7684\u5b58\u5728\uff0c\u7b80\u5316\u786c\u4ef6\u62d3\u6251\u56fe\u5982\u4e0b\uff1a\u4e00\u4e2a\u7269\u7406\u8bbe\u5907\u91cc\u9762\u53ef\u80fd\u6709\u591a\u4e2a\u903b\u8f91\u8bbe\u5907\uff0cHost \u53ef\u4ee5\u5916\u63a5\u591a\u4e2a\u903b\u8f91\u8bbe\u5907\uff0c\u786c\u4ef6\u62d3\u6251\u56fe\u5982\u4e0b\uff1a<\/p>\n<\/li>\n

  2. \n

    \u8981\u7406\u89e3\u534f\u8bae\u5c42\u3001\u7406\u89e3\u6570\u636e\u5982\u4f55\u4f20\u8f93\uff0c\u5e26\u7740\u8fd9\u51e0\u4e2a\u95ee\u9898\u53bb\u5b66\u4e60\uff1a\u63d0\u524d\u7f57\u5217\u51fa\u6765\uff1a<\/p>\n<\/li>\n<\/ol>\n

    \u6570\u636e\u9636\u6bb5\uff1a\u7ed3\u679c\u5982\u4f55\uff1f\u6709\u63e1\u624b\u5305<\/p>\n

    2.1 \u5b57\u8282\/\u4f4d\u4f20\u8f93\u987a\u5e8f\uff1a\u5148\u4f20\u8f93\u6700\u4f4e\u4f4d(LSB)\u3002\u63cf\u8ff0\u6570\u636e\u65f6\u6309\u7167\u4f20\u8f93\u987a\u5e8f\u4ece\u5de6\u5230\u53f3\u5217\u51fa\u6765\u3002<\/p>\n

    2.2 SYNC \u57df\uff1aHost \u53d1\u51fa SOP \u4fe1\u53f7\u540e\uff0c\u5c31\u4f1a\u53d1\u51fa SYNC \u4fe1\u53f7\uff1a\u5b83\u662f\u4e00\u7cfb\u5217\u7684\u3001\u6700\u5927\u4f20\u8f93\u9891\u7387\u7684\u8109\u51b2\uff0c\u63a5\u6536\u65b9\u4f7f\u7528\u5b83\u6765\u540c\u6b65\u6570\u636e\u3002\u5bf9\u4e8e\u4f4e\u901f\/\u5168\u901f\u8bbe\u5907\uff0cSYNC \u4fe1\u53f7\u662f 8 \u4f4d\u6570\u636e(\u4ece\u505a\u5230\u53f3\u662f 00000001)\uff1b\u5bf9\u4e8e\u9ad8\u901f\u8bbe\u5907\uff0cSYNC \u4fe1\u53f7\u662f 32 \u4f4d\u6570\u636e(\u4ece\u5de6\u5230\u53f3\u662f00000000000000000000000000000001)\u3002\u4f7f\u7528 NRZI \u7f16\u7801\u65f6\uff0c\u524d\u9762\u6bcf\u4e2a “0” \u90fd\u5bf9\u5e94\u4e00\u4e2a\u8df3\u53d8\u3002\u5728\u5f88\u591a\u6587\u6863\u91cc\uff0c\u628a SOP \u548c SYNC \u7edf\u4e00\u79f0\u4e3a”SYNC”\uff0c\u5b83\u7684\u610f\u601d\u662f “SYNC” \u4e2d\u542b\u6709 “SOP”\u3002<\/p>\n

    2.3 \u5305\u683c\u5f0f<\/p>\n

    \"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"<\/p>\n

    USB \u603b\u7ebf\u4e0a\u4f20\u8f93\u7684\u6570\u636e\u4ee5\u5305\u4e3a\u5355\u4f4d\u3002USB \u5305\u91cc\u542b\u6709\u54ea\u4e9b\u5185\u5bb9(“\u57df”)\uff1f<\/p>\n

    \u5e27\u53f7\u3001\u6570\u636e\u7b49\u8ddf PID \u76f8\u5173\u7684\u5185\u5bb9<\/p>\n

    CRC \u6821\u9a8c\u7801<\/p>\n

    \u53d1\u8d77\u4e00\u6b21\u5b8c\u6574\u7684\u4f20\u8f93\uff0c\u53ef\u80fd\u6d89\u53ca\u591a\u4e2a\u5305\u3002\u90a3\u4e48\uff0c\u7b2c 1 \u4e2a\u5305\u91cc\u542b\u6709\u3010\u8bbe\u5907\u5730\u5740\u3001\u7aef\u70b9\u53f7\u3011\uff0c\u540e\u7eed\u7684\u5305\u5c31\u6ca1\u5fc5\u8981\u5305\u542b\u8bbe\u5907\u5730\u5740\u3001\u7aef\u70b9\u53f7\u3002<\/p>\n

    2.3.1 PID \u57df<\/p>\n

    \u6ce8\u610f\uff1a\u6240\u6709\u7684 USB \u6587\u6863\u63d0\u5230\u7684”\u8f93\u5165”\u3001”\u8f93\u51fa”\uff0c\u90fd\u662f\u57fa\u4e8e Host \u7684\u89d2\u5ea6\uff0c”\u8f93\u51fa”\u8868\u793a\u4ece Host \u8f93\u51fa\u5230\u8bbe\u5907\uff0c”\u8f93\u5165”\u8868\u793a Host \u4ece\u8bbe\u5907\u5f97\u5230\u6570\u636e\u3002<\/p>\n

    \u6709\u54ea\u4e9b USB \u5305\uff1f\u6839\u636e\u5305\u6570\u636e\u91cc\u7684 PID \u7684 bit1, bit0 \u53ef\u4ee5\u5206\u4e3a4\u7c7b\uff1aPID \u6709 4 \u4f4d\uff0c\u4f7f\u7528 bit1,bit0 \u786e\u5b9a\u5206\u7c7b\uff0c\u4f7f\u7528 bit3,bit2 \u8fdb\u4e00\u6b65\u7ec6\u5206\u3002\u5982\u4e0b\u8868(\u6765\u81ea\u300a\u5708\u5708\u6559\u4f60\u73a9USB\u300b)\u6240\u793a\uff1a<\/p>\n

    \"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"\"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"<\/p>\n

    \u5728 USB \u5305\u4e2d\uff0cPID \u57df\u4f7f\u7528 8 \u4f4d\u6765\u8868\u793a\uff0c\u683c\u5f0f\u5982\u4e0b\uff1a\u524d 4 \u4f4d\u8868\u793a PID\uff0c\u540e 4 \u4f4d\u662f\u5bf9\u5e94\u4f4d\u7684\u53d6\u53cd\u3002\u63a5\u6536\u65b9\u53d1\u73b0\u540e 4 \u4f4d\u4e0d\u662f\u524d 4 \u4f4d\u7684\u53d6\u53cd\u7684\u8bdd\uff0c\u5c31\u8ba4\u4e3a\u53d1\u751f\u4e86\u9519\u8bef\u3002<\/p>\n

    2.3.2 \u4ee4\u724c\u5305(Token)<\/p>\n

    \u4ee4\u724c\u7c7b\u7684 PID\uff0c\u8d77”\u901a\u77e5\u4f5c\u7528”\uff0c\u901a\u77e5\u8c01\uff1fSOF \u4ee4\u724c\u5305\u88ab\u7528\u6765\u901a\u77e5\u6240\u6709\u8bbe\u5907\uff0cOUT\/IN\/SETUP \u4ee4\u724c\u5305\u88ab\u7528\u6765\u901a\u77e5\u67d0\u4e2a\u8bbe\u5907\u3002<\/p>\n

    \u5bf9\u4e8e OUT\u3001IN\u3001SETUP \u4ee4\u724c\u5305\uff0c\u5b83\u4eec\u90fd\u662f\u8981\u901a\u77e5\u5230\u5177\u4f53\u7684\u8bbe\u5907\uff0c\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

    \"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"\"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"\"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"<\/p>\n

    USB \u8bbe\u5907\u7684\u5730\u5740\u6709 7 \u4f4d\uff0c\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

    USB \u8bbe\u5907\u7684\u7aef\u70b9\u53f7\u6709 4 \u4f4d\uff0c\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

    \u5bf9\u4e8e SOF \u5305\uff0c\u82f1\u6587\u540d\u4e3a”Start-of-Frame marker and frame number”\u3002\u5bf9\u4e8e USB \u5168\u901f\u8bbe\u5907\uff0cHost \u6bcf 1ms \u4ea7\u751f\u4e00\u4e2a\u5e27\uff1b\u5bf9\u4e8e\u9ad8\u901f\u8bbe\u5907\uff0c\u6bcf 125us \u4ea7\u751f\u4e00\u4e2a\u5fae\u5e27\uff0c1 \u5e27\u91cc\u6709 8 \u4e2a\u5fae\u5e27\u3002Host \u4f1a\u5bf9\u5f53\u524d\u5e27\u53f7\u8fdb\u884c\u7d2f\u52a0\u8ba1\u6570\uff0c\u5728\u6bcf\u5e27\u6216\u6bcf\u5fae\u5e27\u5f00\u59cb\u65f6\uff0c\u901a\u8fc7 SOF \u4ee4\u724c\u5305\u53d1\u9001\u5e27\u53f7\u3002\u5bf9\u4e8e\u9ad8\u901f\u8bbe\u5907\uff0c\u6bcf 1 \u6beb\u79d2\u91cc\u6709 8 \u4e2a\u5fae\u5e27\uff0c\u8fd9 8 \u4e2a\u5fae\u5e27\u7684\u5e27\u53f7\u662f\u4e00\u6837\u7684\uff0c\u6bcf 125us \u53d1\u9001\u4e00\u4e2a SOF \u4ee4\u724c\u5305\u3002SOF \u4ee4\u724c\u5305\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

    \"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"<\/p>\n

    2.3.3 \u6570\u636e\u5305<\/p>\n

    Host \u4f7f\u7528 OUT\u3001IN\u3001SETUP \u6765\u901a\u77e5\u8bbe\u5907\uff1a\u6211\u8981\u4f20\u8f93\u6570\u636e\u4e86\u3002\u6570\u636e\u901a\u8fc7”\u6570\u636e\u5305”\u8fdb\u884c\u4f20\u8f93\u3002<\/p>\n

    \u6570\u636e\u5305\u4e5f\u6709 4 \u79cd\u7c7b\u578b\uff1aDATA0\u3001DATA1\u3001DATA2\u3001MDATA\u3002\u5176\u4e2d DATA2\u3001MDATA \u5728\u9ad8\u901f\u8bbe\u5907\u4e2d\u4f7f\u7528\u3002\u5bf9\u8f6f\u4ef6\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\uff0c\u6211\u4eec\u6682\u65f6\u4ec5\u9700\u4e86\u89e3 DATA0\u3001DATA1\u3002<\/p>\n

    \u4e3a\u4ec0\u4e48\u8981\u5f15\u5165 DATA0\u3001DATA1 \u8fd9\u4e9b\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u5305\uff1f\u3010\u4e3a\u4e86\u7ea0\u9519\u3011\u3002<\/p>\n

    Host \u548c\u8bbe\u5907\u90fd\u4f1a\u7ef4\u62a4\u81ea\u5df1\u7684\u6570\u636e\u5305\u5207\u6362\u673a\u5236\uff0c\u5f53\u6570\u636e\u5305\u6210\u529f\u53d1\u9001\u6216\u8005\u63a5\u6536\u65f6\uff0c\u6570\u636e\u5305\u7c7b\u578b\u5207\u6362\u3002\u5f53\u68c0\u6d4b\u5230\u5bf9\u65b9\u4f7f\u7528\u7684\u6570\u636e\u5305\u7c7b\u578b\u4e0d\u5bf9\u65f6\uff0cUSB \u7cfb\u7edf\u8ba4\u4e3a\u53d1\u751f\u4e86\u9519\u8bef\u3002<\/p>\n

    \u6bd4\u5982\uff1a\u6570\u636e\u5305\u5927\u5c0f\u5728\u4e0d\u540c\u4f20\u8f93\u6a21\u5f0f\u4e0b\u6709\u4e0d\u540c\u89c4\u5b9a\uff0c\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

    \"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"<\/p>\n

    \u6700\u5927\u6570\u636e\u6709\u6548\u8f7d\u8377\uff1a\u4f4e\u901f\u8bbe\u5907\u4e3a 8 \u5b57\u8282\uff0c\u5168\u901f\u8bbe\u5907\u662f 1023 \u5b57\u8282\uff0c\u9ad8\u901f\u8bbe\u5907\u4e3a 1024 \u5b57\u8282\u3002<\/p>\n

    2.3.4 \u63e1\u624b\u5305<\/p>\n

    \u63e1\u624b\u5305\u6709 4 \u7c7b\uff1aACK\u3001NAK\u3001STALL\u3001NYET<\/p>\n

    2.4 \u4f20\u8f93\u7ec6\u8282<\/p>\n

    2.4.1 \u4f20\u8f93(Transfer)\u548c\u4e8b\u52a1(Transaction)<\/p>\n

    USB \u4f20\u8f93\u7684\u57fa\u672c\u5355\u4f4d\u662f\u5305(Packet)\uff0c\u5305\u7684\u7c7b\u578b\u7531 PID \u8868\u793a\u3002\u4e00\u4e2a\u5355\u7eaf\u7684\u5305\uff0c\u662f\u65e0\u6cd5\u4f20\u8f93\u5b8c\u6574\u7684\u6570\u636e\u3002<\/p>\n

    \u4e3a\u4ec0\u4e48\uff1f\u6bd4\u5982\u60f3\u8f93\u51fa\u6570\u636e\uff0c\u53ef\u4ee5\u53d1\u51fa OUT \u4ee4\u724c\u5305\uff0cOUT \u4ee4\u724c\u5305\u53ef\u4ee5\u6307\u5b9a\u76ee\u7684\u5730\u3002\u4f46\u662f\u6570\u636e\u5982\u4f55\u4f20\u8f93\u5462\uff1f\u8fd8\u9700\u8981\u53d1\u51fa DATA0 \u6216 DATA1 \u6570\u636e\u5305\u3002\u8bbe\u5907\u6536\u5230\u6570\u636e\u540e\uff0c\u8fd8\u8981\u56de\u590d\u4e00\u4e2a ACK \u63e1\u624b\u5305\u3002<\/p>\n

    \u6240\u4ee5\uff0c\u5b8c\u6574\u7684\u6570\u636e\u4f20\u8f93\uff0c\u9700\u8981\u6d89\u53ca\u591a\u4e2a\u5305\uff1a\u4ee4\u724c\u5305\u3001\u6570\u636e\u5305\u3001\u63e1\u624b\u5305\u3002\u8fd9\u4e2a\u3010\u5b8c\u6574\u7684\u6570\u636e\u4f20\u8f93\u8fc7\u7a0b\uff0c\u88ab\u79f0\u4e3a\u4e8b\u52a1(Transaction)\u3011<\/p>\n

    \u6709\u4e9b\u4e8b\u52a1\u9700\u8981\u63e1\u624b\u5305\uff0c\u6709\u4e9b\u4e8b\u52a1\u4e0d\u9700\u8981\u63e1\u624b\u5305\uff0c\u6709\u4e9b\u4e8b\u52a1\u53ef\u4ee5\u4f20\u8f93\u5f88\u5927\u7684\u6570\u636e\uff0c\u6709\u4e9b\u4e8b\u52a1\u53ea\u80fd\u4f20\u8f93\u5c0f\u91cf\u6570\u636e\u3002<\/p>\n

    \u6709\u56db\u7c7b\u4e8b\u52a1\uff1a<\/p>\n

    \u6709\u56db\u7c7b\u4f20\u8f93(Transfer)\uff1a<\/p>\n

    \u6682\u65f6\u8bb0\u4f4f\u8fd9\u4e2a\u5173\u7cfb\uff1a<\/p>\n

    2.4.2 \u8fc7\u7a0b(stage)\u548c\u9636\u6bb5(phase)<\/p>\n

    \u4e8b\u52a1\u7531\u591a\u4e2a\u5305\u7ec4\u6210\uff0c\u6bd4\u5982 Host \u8981\u53d1\u9001\u6570\u636e\u7ed9\u8bbe\u5907\uff0c\u8fd9\u5c31\u4f1a\u6d89\u53ca\u5f88\u591a\u4e2a\u5305\uff1a<\/p>\n

    \u8fd9\u4e2a\u5b8c\u6574\u7684\u4e8b\u52a1\u6d89\u53ca 3 \u4e2a\u5305(Packet)\uff0c\u5206\u4e3a 3 \u4e2a\u9636\u6bb5(Phase)\uff1a<\/p>\n

    \u4e8b\u52a1\u7531\u5305\u7ec4\u6210\uff0c\u8fd9\u4e9b\u5305\u5206\u522b\u5904\u4e8e 3 \u4e2a\u9636\u6bb5(phase)\uff1a\u4ee4\u724c\u9636\u6bb5\uff0c\u6570\u636e\u9636\u6bb5\uff0c\u63e1\u624b\u9636\u6bb5\u3002<\/p>\n

    \u5bf9\u4e8e\u6279\u91cf\u4f20\u8f93\u3001\u4e2d\u65ad\u4f20\u8f93\u3001\u5b9e\u65f6\u4f20\u8f93\uff0c\u5b83\u4eec\u5206\u522b\u7531\u4e00\u4e2a\u4e8b\u52a1\u7ec4\u6210\uff0c\u4e0d\u518d\u7ec6\u5206\u4e3a\u82e5\u5e72\u4e2a\u8fc7\u7a0b\u3002<\/p>\n

    \u3010\u4f46\u662f\u3011\u63a7\u5236\u4f20\u8f93\u7531\u591a\u4e2a\u4e8b\u52a1\u7ec4\u6210\uff0c\u8fd9\u4e9b\u4e8b\u52a1\u5206\u522b\u5904\u4e8e 3 \u4e2a\u8fc7\u7a0b\uff1a\u5efa\u7acb\u8fc7\u7a0b(stage)\u3001\u6570\u636e\u8fc7\u7a0b(stage)\u3001\u72b6\u6001\u8fc7\u7a0b(stage)\u3002<\/p>\n

    \u603b\u7ed3\u8d77\u6765\u5c31\u662f\uff1a<\/p>\n

    2.4.3 \u6279\u91cf\u4f20\u8f93<\/p>\n

    \u6279\u91cf\u4f20\u8f93\u7528\u6279\u91cf\u4e8b\u52a1\u6765\u5b9e\u73b0\uff0c\u7528\u4e8e\u4f20\u8f93\u5927\u91cf\u7684\u6570\u636e\uff0c\u6570\u636e\u7684\u6b63\u786e\u6027\u6709\u4fdd\u8bc1\uff0c\u65f6\u6548\u6ca1\u6709\u4fdd\u8bc1\u3002<\/p>\n

    \u6279\u91cf\u4e8b\u52a1\u7531 3 \u4e2a\u9636\u6bb5(phase)\u7ec4\u6210\uff1a\u4ee4\u724c\u9636\u6bb5\u3001\u6570\u636e\u9636\u6bb5\u3001\u63e1\u624b\u9636\u6bb5\u3002\u6bcf\u4e2a\u9636\u6bb5\u90fd\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u5305\uff0c\u542b\u6709 SOP\u3001SYNC\u3001PID\u3001EOP\u3002<\/p>\n

    2.4.4 \u4e2d\u65ad\u4f20\u8f93<\/p>\n

    \u4e2d\u65ad\u4f20\u8f93\u7528\u4e2d\u65ad\u4e8b\u52a1\u6765\u5b9e\u73b0\uff0c\u7528\u4e8e\u4f20\u8f93\u5c0f\u91cf\u7684\u3001\u5468\u671f\u6027\u7684\u6570\u636e\uff0c\u6570\u636e\u7684\u6b63\u786e\u6027\u548c\u65f6\u6548\u90fd\u6709\u4fdd\u8bc1\u3002<\/p>\n

    \u4e2d\u65ad\u4e8b\u52a1\u7531 3 \u4e2a\u9636\u6bb5(phase)\u7ec4\u6210\uff1a\u4ee4\u724c\u9636\u6bb5\u3001\u6570\u636e\u9636\u6bb5\u3001\u63e1\u624b\u9636\u6bb5\u3002\u6bcf\u4e2a\u9636\u6bb5\u90fd\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u5305\uff0c\u542b\u6709 SOP\u3001SYNC\u3001PID\u3001EOP\u3002<\/p>\n

    \u4e2d\u65ad\u4e8b\u52a1\u8ddf\u6279\u91cf\u4e8b\u52a1\u975e\u5e38\u7c7b\u4f3c\uff0cHost \u4f7f\u7528\u5b83\u6765\u5468\u671f\u6027\u5730\u8bfb\u6570\u636e\u3001\u5199\u6570\u636e\u3002<\/p>\n

    \u4ee5\u9f20\u6807\u4e3a\u4f8b\uff0c\u6211\u4eec\u9700\u8981\u53ca\u65f6\u83b7\u5f97\u9f20\u6807\u7684\u6570\u636e\uff0c\u4e0d\u53ca\u65f6\u7684\u8bdd\u4f60\u4f1a\u611f\u89c9\u9f20\u6807\u5f88\u8fdf\u949d\u3002\u4f46\u662f USB \u534f\u8bae\u4e2d\u5e76\u6ca1\u6709\u4e2d\u65ad\u529f\u80fd\uff0c\u5b83\u4f7f\u7528”\u5468\u671f\u6027\u7684\u8bfb\u3001\u5199”\u6765\u5b9e\u73b0\u53ca\u65f6\u6027\u3002\u5177\u4f53\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n

    \u4e2d\u65ad\u4e8b\u52a1\u7684\u3010\u4f18\u5148\u7ea7\u3011\u6bd4\u6279\u91cf\u4e8b\u52a1\u66f4\u9ad8\uff0c\u5b83\u8981\u6c42\u5b9e\u65f6\u6027\uff0c\u800c\u6279\u91cf\u4e8b\u52a1\u4e0d\u8981\u6c42\u5b9e\u65f6\u6027\u3002<\/p>\n

    2.4.5 \u5b9e\u65f6\u4f20\u8f93<\/p>\n

    \u5b9e\u65f6\u4f20\u8f93\u7528\u5b9e\u65f6\u4e8b\u52a1\u6765\u5b9e\u73b0\uff0c\u7528\u4e8e\u4f20\u8f93\u5b9e\u65f6\u6570\u636e\uff0c\u5bf9\u6570\u636e\u7684\u6b63\u786e\u6027\u6ca1\u6709\u8981\u6c42\u3002<\/p>\n

    \u5b9e\u65f6\u4e8b\u52a1\u7531 2 \u4e2a\u9636\u6bb5(phase)\u7ec4\u6210\uff1a\u4ee4\u724c\u9636\u6bb5\u3001\u6570\u636e\u9636\u6bb5\u3002\u6bcf\u4e2a\u9636\u6bb5\u90fd\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u5305\uff0c\u542b\u6709 SOP\u3001SYNC\u3001PID\u3001EOP\u3002<\/p>\n

    \u5b9e\u65f6\u4e8b\u52a1\u4e0d\u9700\u8981\u63e1\u624b\u9636\u6bb5\uff0c\u4e00\u4e2a\u793a\u4f8b\u7684\u573a\u666f\u662f\uff1a\u4e3a\u4e86\u4f20\u8f93\u6444\u50cf\u5934\u7684\u5b9e\u65f6\u6570\u636e\uff0c\u5076\u5c14\u7684\u6570\u636e\u9519\u8bef\u662f\u53ef\u4ee5\u5fcd\u53d7\u7684\uff0c\u5927\u4e0d\u4e86\u51fa\u73b0\u77ed\u6682\u7684\u82b1\u5c4f\u3002\u5982\u679c\u4e3a\u4e86\u89e3\u51b3\u82b1\u5c4f\u800c\u91cd\u4f20\u6570\u636e\uff0c\u90a3\u5c31\u4f1a\u5bfc\u81f4\u540e\u7eed\u753b\u9762\u88ab\u63a8\u8fdf\uff0c\u5b9e\u65f6\u6027\u65e0\u6cd5\u5f97\u5230\u4fdd\u8bc1\u3002<\/p>\n

    2.4.6 \u63a7\u5236\u4f20\u8f93<\/p>\n

    \u5728\u4f7f\u7528\u6279\u91cf\u4f20\u8f93\u65f6\uff0c\u4f7f\u7528 IN \u4ee4\u724c\u5305\u6216 OUT \u4ee4\u724c\u5305\u8868\u793a\u6570\u636e\u4f20\u8f93\u65b9\u5411\u3002<\/p>\n

    \u63a7\u5236\u4f20\u8f93\u7684\u4ee4\u724c\u5305\u6c38\u8fdc\u662f SETUP\uff0c\u600e\u4e48\u5206\u8fa8\u662f\u8bfb\u6570\u636e\uff0c\u8fd8\u662f\u5199\u6570\u636e\uff1f\u53d1\u51fa SETUP \u4ee4\u724c\u5305\u540e\uff0c\u8fd8\u8981\u53d1\u51fa DATA0 \u6570\u636e\u5305\uff0c\u6839\u636e\u6570\u636e\u7684\u5185\u5bb9\u6765\u786e\u5b9a\u540e\u7eed\u662f\u8bfb\u6570\u636e\uff0c\u8fd8\u662f\u5199\u6570\u636e\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3a”\u5efa\u7acb\u4e8b\u52a1”(SETUP Transaction)<\/p>\n

    \u4f46\u662f\u63a7\u5236\u4f20\u8f93\u7531\u591a\u4e2a\u4e8b\u52a1\u7ec4\u6210\uff0c\u8fd9\u4e9b\u4e8b\u52a1\u5206\u522b\u5904\u4e8e 3 \u4e2a\u8fc7\u7a0b\uff1a\u5efa\u7acb\u8fc7\u7a0b(stage)\u3001\u6570\u636e\u8fc7\u7a0b(stage)\u3001\u72b6\u6001\u8fc7\u7a0b(stage)\u3002<\/p>\n

    \u72b6\u6001\u8fc7\u7a0b(stage)\uff0c\u4f7f\u7528\u6279\u91cf\u4e8b\u52a1\uff1a<\/p>\n

    \u4e0a\u56fe\u4e2d\u7684\u6bcf\u4e00\u4e2a\u65b9\u6846\uff0c\u90fd\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u4e8b\u52a1\uff0c\u542b\u6709\uff1aToken Packet\u3001Data Packet\u3001Handshake Packet\u3002<\/p>\n

      \n
    1. \u4f7f\u7528\u5de5\u5177\u4f53\u9a8c\u6570\u636e\u683c\u5f0f<\/li>\n<\/ol>\n

      LeCroy(\u529b\u79d1)\u6210\u7acb\u4e8e 1964 \u5e74\uff0c\u662f\u4e00\u5bb6\u4e13\u4e1a\u751f\u4ea7\u793a\u6ce2\u5668\u5382\u5bb6\u3002\u65d7\u4e0b\u751f\u4ea7\u6709\u6570\u5b57\u793a\u6ce2\u5668\u3001SDA \u7cfb\u5217\u6570\u5b57\u793a\u6ce2\u5668\u3001\u6df7\u5408\u4fe1\u53f7\u793a\u6ce2\u5668\u3001\u6a21\u5757\u5316\u4eea\u5668\u3001\u4efb\u610f\u6ce2\u5f62\u53d1\u751f\u5668\u3002\u53ef\u4ee5\u5728\u641c\u7d22\u5f15\u64ce\u91cc\u641c”usbprotocolsuite” \u4e0b\u8f7d USB \u6293\u5305\u5de5\u5177\u3002<\/p>\n

      \u5b89\u88c5”usbprotocolsuite”\u540e\uff0c\u53ef\u4ee5\u5728\u6587\u6863\u76ee\u5f55\u91cc\u627e\u6253\u5f88\u591a\u793a\u7a0b\u5e8f(\u540e\u7f00\u540d\u4e3ausb)\uff1a<\/p>\n

      \"\u63e1\u624b\u5305\u7684\u6587\u4ef6\u683c\u5f0f\"<\/p>\n","protected":false},"excerpt":{"rendered":"

      USB \u534f\u8bae\u5c42\u6570\u636e\u683c\u5f0f1. \u786c\u4ef6\u62d3\u6251\u7ed3\u6784\u5728\u8f6f\u4ef6\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5ffd\u7565 Hub \u7684\u5b58\u5728\uff0c\u786c\u4ef6\u62d3\u6251\u56fe\u7b80\u5316\u5982\u4e0b\uff1a\u4e00\u4e2a\u7269\u7406\u8bbe\u5907\u91cc\u9762\u53ef\u80fd\u6709\u591a\u4e2a\u903b\u8f91\u8bbe\u5907\uff0cHost \u53ef\u4ee5\u5916\u63a5\u591a\u4e2a\u903b\u8f91\u8bbe\u5907\uff0c\u786c\u4ef6\u62d3\u6251\u56fe\u5982\u4e0b\uff1a2<\/p>\n","protected":false},"author":1,"featured_media":4061,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"topic":[],"class_list":["post-4060","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-1"],"_links":{"self":[{"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/posts\/4060","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/comments?post=4060"}],"version-history":[{"count":0,"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/posts\/4060\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/media\/4061"}],"wp:attachment":[{"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/media?parent=4060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/categories?post=4060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/tags?post=4060"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.ccwifi.cc\/blogs\/wp-json\/wp\/v2\/topic?post=4060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}