ÒøÓégegÓÅÔ½»á

http://edadoc.com/

ÖÐÎÄ

EN JP
ºá·ù¹ã¸æbanner-¸ßËÙÏÈÍâÐлú°æ
Ϊʲô´®×è×èֵͨ³£ÊÇ22µ½33Å·Ä· £¬¿´Íêºó²»ÐÅÄã²»¶®£¡

Ϊʲô´®×è×èֵͨ³£ÊÇ22µ½33Å·Ä· £¬¿´Íêºó²»ÐÅÄã²»¶®£¡

Ðû²¼Ê±¼ä£º2024-06-04 08:39

ÒøÓéÓÅÔ½»á¡¤GEG(Öйú)ÓÐÏÞ¹«Ë¾¹ÙÍø ÒøÓéÓÅÔ½»á¡¤GEG(Öйú)ÓÐÏÞ¹«Ë¾¹ÙÍø

ÔÚÔ­Àíͼ»òÕßPCBÉè¼ÆÉÏͨ³£»á¿´µ½Ðí¶àʱÖÓ»òÕßÖÖÖÖЭÒéµÄÊý¾ÝÐźÅÔÚоƬ·¢ËͶ˻ᴮ½Ó22µ½ 33Å·Ä·µÄµç×è¡£ÄDz»ÖªµÀ¸÷ÈËÓÐûÓÐÏë¹ý £¬ÎªÊ²Ã´ÒªÑ¡ÔñÕâ¸ö¹æÄ£µÄ×èֵĨ£¿¸ßËÙÏÈÉú½ñÌì¾Í´ÓÊÖÒÕÔ­ÀíµÄ½Ç¶ÈÀ´¸ø¸÷È˻ظ²Ï°ɣ¡

¸ßËÙÏÈÌìÉúÔ±--»Æ¸Õ


ÓÖÊÇÒ»ÄêµÄ¸ß¿¼¼¾ £¬Ã¿µ±Õâ¸öʱ¼ä £¬Chris×ܻ᲻×Ô¾õµÄ·¢³ö¸ÐÉË £¬¸ß¿¼ÄÇ»áÕæµÄÊÇÀíÂÛ֪ʶµÄáÛ·å £¬ÄÃÆð±ÊÀ´¾ÍÄÜд³öÖÖÖֵ緵Ĺ«Ê½ £¬ÈýÏÂÁ½³ý¶þ¾ÍÄÜÍÆµ¼³öÖÖÖÖÎïÀíÎÊÌâµÄЧ¹û¡£

²»ÏñÏÖÔÚ £¬ÊÂÇé¶àÄêºó´ó´ó¶¼ÇéÐÎÏÂÖ»»áÓ÷ÂÕæµÄ·½·¨À´»ñµÃ £¬¹ØÓÚÖÖÖÖÀíÂÛÅÌË㳡¾°¶¼¾´¶øÔ¶Ö®ÁË£¡³Ãן߿¼µÄ´Ì¼¤ £¬ChrisÍýÏëÔÙÕõÔúÏ £¬¸ø¸÷ÈË·ÖÏíһƪÓеãÀíÂÛÐ͵ÄÎÄÕ¹þ£¡


ÔÚÉè¼ÆÉÏʹÓô®×èµÄ³¡¾°¸÷È˶¼¼ûµÃ¶àÁË £¬»ù±¾ÉÏÐí¶à1GHzÒÔϵĵ¥¶ËÐźŶ¼ÓпÉÄÜÓõ½¡£´ÓÐźÅÀàÐÍÀ´¿´ £¬ÏñµÍËÙµãµÄI2CÐźš¢local busÐźŵ½¸ßÒ»µãµÄflashÐźš¢ÒÔÌ«ÍøRGMIIÐźÅ £¬ÉõÖÁÔÙ¸ßÒ»µãµÄDDR1µ½DDR2µÄÊý¾ÝÐźÅ £¬¶¼ÄÜ¿´µ½´®×èµÄÉíÓ°¡£

298-02.png

ÒÔRGMIIΪÀý £¬µ¥¸ùÐźŵÄËÙÂÊ»òÐíÊÇ250Mbps £¬ÊǺÜÊǵ䷶µÄÐèÒª¼Ó´®×èµÄÓ¦Óó¡¾°¡£ÄÇÁÐλӲ¼þ¹¤³Ìʦ»òÕßÉè¼Æ¹¤³Ìʦ £¬ÄãÃÇÓ¡ÏóÖеĴ®×èµÄ×èÖµÒ»Ñùƽ³£ÊǼ¸¶àÄØ £¬ÊDz»ÊǾÍÊÇ22Å·Ä·»òÕß33Å·Ä·ÄØ£¿²»ÖªµÀ¸÷ÈËÓÐûÓÐÏë¹ýΪʲô»ù±¾¾ÍÊÇÕâÁ½¸öÖµ £¬»òÕß»ù±¾¾ÍÊÇÔÚ22µ½33Å·Ä·Õâ¸ö¹æÄ£ÄØ£¿ÕâÄÚÀ﾿¾¹Òþ²Ø×ÅʲôÀíÂÛ £¬Chris½«¸ø¸÷ÈË×Ðϸ˵˵£¡


Ê×Ïȸ÷ÈËÐèÒªÖªµÀµÄÊÇ £¬ÏñÉÏÃæËµµ½µÄÕâÒ»ÀàÐ͵ÄÐźÅ £¬Ö÷ÒªµÄµçƽ±ê×¼¶¼°Ë¾Å²»ÀëÊ® £¬¾ÍÊÇÏÂÃæµÄÕâЩ¡£

298-04.png

²î±ðµÄµçƽ±ê×¼´ÓÌåÏÖÉÏ¿´¾ÍÊÇµçÆ½²î±ð £¬ÉÐÓоÍÊÇÉÏÉýʱ¼ä·×ÆçÑù¡£ÎÒÃÇÄýñÌìÒªÑо¿µÄLVCMOSµçƽΪÀýÀ´Ëµ £¬ÎÒÃÇÕÒµ½Ò»¸ö¾ßÓÐ¸ÃµçÆ½±ê×¼µÄibisÄ£×Ó £¬¿´¿´LVCMOSµçƽµÄһЩ

µçÐÔÄܲÎÊý¡£

298-05.png

ÉÏÃæ³ýÁË˵Ã÷¸ÃµçƽµÄµçѹ±ê×¼ £¬ãÐÖµ¹æÄ£Íâ £¬¸üÖ÷ÒªµÄ×Åʵ¼Í¼×Å¸ÃµçÆ½µÄÊäÈëÊä³öµÄÐÐÎªÌØÕ÷ £¬Ò²¾ÍÊÇË׳ƵÄV-TÇúÏß¡£ÀýÈçÎÒÃÇ·­¿ªÓë±¾ÎÄÇ¿Ïà¹ØµÄrising waveformÕâÒ»Ïî £¬ÄÚÀï

¿ÉÒÔ¿´µ½Ëü¹ØÓÚÇл»µçƽµÄÌØÕ÷¡£

298-06.png

¿´µ½Õâ £¬ÎÒÏàП÷ÈËÕÕ¾ÉûŪ¶® £¬¿´ÕâÍæÒ⾿¾¹¸úÒªÚ¹ÊÍÔÚÉè¼ÆÉϼӼ¸¶àÅ·Ä·µÄ´®×èÓÐʲô¹ØÏµÄØ£¿


ChrisÎÞ·ÁÏÈÎÊÎʸ÷ÈË £¬ÔÚÉè¼ÆÉϼӴ®×èµÄ×÷ÓÃÊÇʲô£¿Õâ¸ö¸÷ÈËÔ¤¼Æ¶¼½ÏÁ¿ÏàʶÁË £¬¾ÍÊÇΪÁ˸ÄÉÆÔ´¶ËÐźŵķ´Éä £¬ÏêϸµÄÔ­Àí¸÷ÈË¿ÉÒÔ»ØÊ×ÏÂÕâÆªÎÄÕ£¨Á´½Ó¡¶Ì½ÌÖÔ´¶Ë´®Áª¶Ë½Ó¡·£©¡£

ÔÚÄÚÀïÌáÈ¡µ½Ò»¸öºÜÖ÷ÒªµÄÐÅÏ¢µã £¬ÄǾÍÊÇÎÒÃÇÔÚоƬ·¢ËͶ˼ӵĴ®×èµÄ×èÖµ×ÅʵÊÇΪÁ˺ÍоƬµÄÄÚ×è¼ÓÆðÀ´¼´ÊÇ50Å·Ä·À´³ÉΪ×î¼ÑµÄ¶Ë½Ó¼Æ»®¡£ÄÇôÎÊÌâÓÖÀ´ÁË £¬ÎÒÃÇÔõô֪µÀоƬµÄÄÚ

×èÊǼ¸¶àÄØ£¿ÕâÒ²ÊDZ¾ÎĵĽ¹µãÎÊÌâ £¬ÎÒÃÇÖ»ÓÐÖªµÀÁËоƬµÄÄÚ×èÊǼ¸¶à £¬²Å»ª¹»È¥Ñ¡ÔñºÏÊʵĴ®×è¾ÙÐкÏÀíµÄ¶Ë½Ó £¬±¬·¢½ÏÁ¿ºÃµÄЧ¹û¡£


Chris½ñÌì¾Í½Ì¸÷ÈËÔõÑù´ÓibisÄ£×ÓÖÐÅÌËã³öоƬÄÚ×裡ÉÏÃæËµÁË £¬ibisÄ£×Óչʾ¸ø¸÷ÈËÊǶ¼ÊÇV-TÇúÏß¡¢I-TÇúÏß £¬I-VÇúÏßÕâЩÐÐΪ¼¶µÄ²ÎÊý £¬ÎÒÃÇÖ»ÓдÓÕâЩÇúÏßÈ¥ÍÆµ¼³ö¸ÃµçƽÊä³öbuffer

µÄÄÚ×è¡£ÏêϸÔõô×öÄØ£¿ÎÒÃÇÕվɿ´»Ø¸Õ¸ÕµÄrising waveformÇúÏß £¬ÕâÕÅͼÄÚÀïÓÐÁ½¸öÒªº¦µÄµã £¬Ò»¸öÊǺìµÄȦȦµÄоƬ¸ÃbufferµÄ²âÊÔÑéÖ¤ÇéÐÎ £¬ÁíÍâ¾ÍÊÇÂÌɫȦȦµÄ²âÊÔ³öÀ´µÄÖµ£¨ÎÒ

ÃÇ¿´typicalµÄÖµ£©¡£

298-07.png

ÕâÕÅͼÐÎòµÄÒâ˼ÊÇÕâÑùµÄ£º²âÊÔÇéÐÎÊǰѸÃÊä³öbuffer½Ó50Å·Ä·µç×èµ½µØ¾ÙÐÐÊä³ö²âÊÔ £¬È»ºóÈ¥ÊÓ²ì50Å·Ä·µç×èλÖõÄÖµÊÇ2.18V×óÓÒ £¬Ó÷ÂÕæÈí¼þÈ¥´î½¨¾ÍÊÇÕâ¸öÑù×ÓÁË¡£

298-08.png

VINµÄÖµ²âÊÔ³öÀ´¾ÍÊÇ2.18V £¬ÄÇô¸ÃbufferµÄÄÚ×èÒªÔõôÅÌËãÄØ£¿×ÅʵԭÀí¾ÍÊǰÑÄÚ×èRºÍ50Å·Ä·µç×è¾ÙÐзÖѹ £¬»ñµÃVINÊÇ2.18VµÄÀú³Ì¡£ÄÇôChris»òÐíÔÚÖ½ÉÏËãÁËÏ £¬»ñµÃµÄÄÚ×è¾ÍÊÇÕâ

ÑùµÄÁË¡£

298-09.png

àÅ £¬×ÅʵҲ²»ÊǺÜÄÑÊǰÉ £¬Õâ¸öʱ¼ä¾ÍÍÆµ¼³öÁ˸ÃbufferµÄÄÚ×è»òÐíÊÇ26Å·Ä·µÄÑù×Ó¡£×ÅʵÄãÃǶàÕÒ¼¸¸ö²î±ðµçƽµÄbufferÈ¥ËãËã¾Í»á·¢Ã÷ £¬ÄÚ×èµÄ¹æÄ£»òÐíÒ²ÔÚ17µ½30Å·Ä·×óÓÒ¡£Òò´Ë¸÷ÈË

Ò²¾ÍÖªµÀÁËΪʲôÎÒÃÇÎÞÄÔÓÃ22Å·Ä·µ½33Å·Ä·Ò²»ù±¾Äִܵï½ÏÁ¿ºÃµÄ¶Ë½ÓЧ¹ûÁË¡£


ÄÇÔÚÎÒÃÇÕâ¸öcaseÖÐ £¬Ê¹ÓÃÕâ¸öµçƽbufferʱ £¬Ëã³öÀ´µÄÄÚ×èÊÇ26Å·Ä·×óÓÒ £¬ÄÇÎÒÃǾÍÓÃÒ»¸ö22Å·Ä·µÄ´®×è¾ÙÐж˽Ó £¬¼ÓÆðÀ´²îδ¼¸¾ÍÊÇ50Å·Ä·ÁË £¬È»ºóÔÚ200MµÄËÙÂÊÏ¿´¿´¼Ó´®×èºÍ²»¼Ó

´®×èµÄ·ÂÕæÐ§¹û±ÈÕÕ£¡

298-11.png

¾­ÓÉÎÒÃÇÀíÂÛËã³öÀ´µÄÄÚ×è £¬È»ºóÔÙȥ׼ȷµÄÅäÉϺÏÊʵĴ®×èºó £¬¸÷ÈË´ÓЧ¹ûÊǾÍÄÜ¿´µ½ÎüÊն˵IJ¨ÐÎÊǺÜÊǵÄÀíÏë £¬Ô£Á¿´óµ½Ã»±ß £¬Í¬Ê±Ò²ÄÜ¿´µ½²»¼Ó´®×èʱµÄ¹ý³åµ¼ÖÂÐźÅÖÊÁ¿µÄ¶ñ»¯¹þ£¡

298-12.png

ÒªÁì¶¼ÊÇÈËÏë³öÀ´µÎ £¬Í¨¹ýÕâ¸öÒªÁìÀ´×¼È·µÄ¾ÙÐд®×èµÄ¶Ë½Ó £¬¾ÍÄÜʹÐźŵÄÔ£Á¿¸ü´ó £¬²»È»¾ÍÖ»ÄÜÕվɼÌÐøÅÄÄÔ¿ÇÀ´·Å´®×èÖµÁË¡£Ï£Íû¸÷È˶¼¶àÄÃÆð±ÊÀ´Ð´Ð´¹«Ê½ £¬¸üÖ÷ÒªµÄÊÇÒªÏñÄãÃÇÎôʱ

¸ß¿¼ÄÇ»á £¬¼ÌÐø¼á³Ö×ÅÒ»¿Å×êÑеÄÐÄ £¬ÊÂʵ֤ʵÔÚÊÂÇéÖÐÒ²Õվɻҳ£µÄÓÐÓÃŶ£¡


ÎÊÌâÀ´ÁË£º


»Ø¹ýÍ·ÎÊÎʸ÷ÈË £¬ÄÇÄãÃÇÊÇÔõôÀ´¶¨Ñ¡Ôñ¼¸¶àÅ·Ä·µÄ´®×èÄØ £¬»òÕßÄãÃÇ»¹ÖªµÀÆäËûµÄ¶Ë½Ó·½·¨Âð£¿

ÍøÕ¾µØÍ¼