USB 2.0ÌáËÙ²¹¶¡¼°Ê¹Ó÷½·¨
·¢²¼£º2013-3-11 9:36:37 À´Ô´:×ªÔØ ä¯ÀÀ´Î ±à¼£ºØýÃû
ËäÈ»IntelºÍAMDÅ䱸USB 3.0¿ØÖÆÆ÷µÄÖ÷°åÒѾ´óÁ¿ÉÏÊУ¬µ«¶ÔÓÚÒѾѡÔñÁËÖ»ÓÐUSB 2.0µÄÖ÷°åµÄÓû§À´Ëµ£¬ÓÃUSB 2.0ÉÁ´æ¡¢Òƶ¯Ó²ÅÌ¿½±´´óÎļþʱ£¬¿´×ÅÄÇÎÏÅ£°ãµÄ½ø¶ÈÌõ£¬ÓÐľÓÐÖÖ²»ÄÍ·³µÄ¸Ð¾õ°¡£¿ÄÇô¿ìÀ´¿´¿´£¬ÌáËÙÆäʵºÜ¼òµ¥¡£
USB 2.0Ϊɶ´ï²»µ½60MB/s£¿
´ó¼Ò¶¼ÖªµÀUSB 2.0µÄÀíÂÛ´ø¿íÊÇ480Mbps£¬Ò²¾ÍÊÇ60MB/sµÄÊý¾Ý´«ÊäËÙÂÊ£¬µ«Êµ¼ÊʹÓÃÖÐÎÒÃǻᷢÏÖÕâ¸öÀíÂÛËÙ¶ÈÊǿӵùµÄ£¬³¤ÆÚÒÔÀ´USB 2.0×î¸ßʵ¼Ê´«ÊäËٶȱ»ÏÞÖÆÔÚ30MB/s×óÓÒ£¬Ö»ÄÜ´ïµ½ÀíÂÛ´ø¿íµÄÒ»°ë¡£ÕâÊÇÓÉÓÚÂäºóµÄÐÒéºÍ±àÂ뷽ʽÔì³ÉµÄ¡£
USB 2.0²ÉÓõÄÊÇ´«Í³µÄBulk-Only Transport(BOT)ÐÒ飬ÓÉÓÚûÓнøÐиÄÉÆ£¬Ëæ×ÅĿǰ¸ßËÙ´æ´¢É豸µÄ³öÏÖ£¬BOTÐÒé×è°USB´«ÊäËÙÂʵÄÎÊÌâÒѾÏÔÏÖ³öÀ´¡£¶øÄ¿Ç°µÄUSB 3.0ÐÂÔöÁËUSB Attached SCSI Protocol£¨UASP£©ÐÒ飬ÐÂÔöÁËÁ½×éÊý¾Ý×ÜÏߣ¬Ö§³Ö¶àÃüÁî²¢·¢Ö´ÐкÍNCQ¶ÓÁй¦ÄÜ£¬ÕâÑù¾Í¿ÉÒÔ·¢»Ó³ö5GbpsµÄ¸ßËÙ´ø¿íÓÅÊÆ¡£
ÁíÍ⣬USB 2.0ʹÓÃÁËNRZI£¨Non-Return-to-Zero Inverted£©±àÂ뷽ʽ£¬ËüÊÇ»ùÓÚ´®Ðд«Êäģʽ£¬´«ÊäÁ¬ÐøµÄ0¡¢1×Ö·û´®£¬ÓÉÓÚÆäÖÐÐèÒªÇ¿ÖÆ²å0ÒÔ±£³Ö·¢ËͶ˺ͽÓÊÕ¶ËÆµÂÊͬ²½»áÔì³ÉUSB 2.0´«Êä´ø¿íµÄÀË·Ñ¡£¶øUSB 3.0²ÉÓÃÁËʱÏÂÁ÷ÐеÄ8b/10b±àÂ뷽ʽ£¬ÓÐЧÊý¾ÝÀûÓÃÂÊΪ80%£¬Ò²¾ÍÊÇUSB 3.0µÄÓÐЧÊý¾Ý´«Êä´ø¿íΪ500MB/s¡£
С²¹¶¡ÎªUSB 2.0´óÌáËÙ
΢ÈíĿǰ·Å³öÒ»¸ö²¹¶¡À´Ìá¸ßUSBÉ豸µÄ·ÃÎÊËÙ¶È£¬ÓÉÓÚËüÊÇÒ»¸öHotFixÈÈÐÞ¸´²¹¶¡£¬²¢Ã»ÓÐ×÷Ϊ³£¹æ²¹¶¡ËæÏµÍ³×Ô¶¯¸üУ¬Òò´ËÎÒÃÇÆ½Ê±Ò²¾ÍÌå»á²»µ½ËüµÄ×÷Óã¬ÄÇôÎÒÃÇ¿ÉÒÔ×Ô¼ºÀ´ÊÖ¶¯ÏÂÔØ°²×°¡£
USB 2.0Ϊɶ´ï²»µ½60MB/s£¿
´ó¼Ò¶¼ÖªµÀUSB 2.0µÄÀíÂÛ´ø¿íÊÇ480Mbps£¬Ò²¾ÍÊÇ60MB/sµÄÊý¾Ý´«ÊäËÙÂÊ£¬µ«Êµ¼ÊʹÓÃÖÐÎÒÃǻᷢÏÖÕâ¸öÀíÂÛËÙ¶ÈÊǿӵùµÄ£¬³¤ÆÚÒÔÀ´USB 2.0×î¸ßʵ¼Ê´«ÊäËٶȱ»ÏÞÖÆÔÚ30MB/s×óÓÒ£¬Ö»ÄÜ´ïµ½ÀíÂÛ´ø¿íµÄÒ»°ë¡£ÕâÊÇÓÉÓÚÂäºóµÄÐÒéºÍ±àÂ뷽ʽÔì³ÉµÄ¡£
USB 2.0²ÉÓõÄÊÇ´«Í³µÄBulk-Only Transport(BOT)ÐÒ飬ÓÉÓÚûÓнøÐиÄÉÆ£¬Ëæ×ÅĿǰ¸ßËÙ´æ´¢É豸µÄ³öÏÖ£¬BOTÐÒé×è°USB´«ÊäËÙÂʵÄÎÊÌâÒѾÏÔÏÖ³öÀ´¡£¶øÄ¿Ç°µÄUSB 3.0ÐÂÔöÁËUSB Attached SCSI Protocol£¨UASP£©ÐÒ飬ÐÂÔöÁËÁ½×éÊý¾Ý×ÜÏߣ¬Ö§³Ö¶àÃüÁî²¢·¢Ö´ÐкÍNCQ¶ÓÁй¦ÄÜ£¬ÕâÑù¾Í¿ÉÒÔ·¢»Ó³ö5GbpsµÄ¸ßËÙ´ø¿íÓÅÊÆ¡£
ÁíÍ⣬USB 2.0ʹÓÃÁËNRZI£¨Non-Return-to-Zero Inverted£©±àÂ뷽ʽ£¬ËüÊÇ»ùÓÚ´®Ðд«Êäģʽ£¬´«ÊäÁ¬ÐøµÄ0¡¢1×Ö·û´®£¬ÓÉÓÚÆäÖÐÐèÒªÇ¿ÖÆ²å0ÒÔ±£³Ö·¢ËͶ˺ͽÓÊÕ¶ËÆµÂÊͬ²½»áÔì³ÉUSB 2.0´«Êä´ø¿íµÄÀË·Ñ¡£¶øUSB 3.0²ÉÓÃÁËʱÏÂÁ÷ÐеÄ8b/10b±àÂ뷽ʽ£¬ÓÐЧÊý¾ÝÀûÓÃÂÊΪ80%£¬Ò²¾ÍÊÇUSB 3.0µÄÓÐЧÊý¾Ý´«Êä´ø¿íΪ500MB/s¡£
С²¹¶¡ÎªUSB 2.0´óÌáËÙ
΢ÈíĿǰ·Å³öÒ»¸ö²¹¶¡À´Ìá¸ßUSBÉ豸µÄ·ÃÎÊËÙ¶È£¬ÓÉÓÚËüÊÇÒ»¸öHotFixÈÈÐÞ¸´²¹¶¡£¬²¢Ã»ÓÐ×÷Ϊ³£¹æ²¹¶¡ËæÏµÍ³×Ô¶¯¸üУ¬Òò´ËÎÒÃÇÆ½Ê±Ò²¾ÍÌå»á²»µ½ËüµÄ×÷Óã¬ÄÇôÎÒÃÇ¿ÉÒÔ×Ô¼ºÀ´ÊÖ¶¯ÏÂÔØ°²×°¡£