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gaopinPCBbanbuxiandejiqiao（neifuSIfangzhenmingcijieshi）2019-04-10 13:34·EDA365dianziluntanbuxiandejiqiao（1）gaopindianluwangwangjichengdujiaogao，buxianmiduda，caiyongduocengbanjishibuxiansuobixude，yeshijiangdiganraodeyouxiaoshouduan。（2）gaosudianluqijianguanjiaojiandeyinxianwanzheyueshaoyuehao。gaopindianlubuxiandeyinxianzuihaocaiyongquanzhixian，xuyaozhuanzhe，keyong45°zhexianhuoyuanhuzhuanzhe，manzuzheyiyaoqiukeyijianshaogaopinxinhaoduiwaidefashehexianghujiandezuohe。（3）gaopindianluqijianguanjiaojiandeyinxianyueduanyuehao。（4）gaopindianluqijianguanjiaojiandeyinxiancengjianjiaotiyueshaoyuehao。suowei“yinxiandecengjianjiaotiyueshaoyuehao”shizhiyuanjianlianjieguochengzhongsuoyongdeguokong（Via）yueshaoyuehao，juce，yigeguokongkedailaiyue0.5 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InteRFerence）youchuandaoganraohefusheganraoliangzhong。chuandaoganraoshizhitongguodaodianjiezhibayigedianwangluoshangdexinhaozuohe（ganrao）daolingyigedianwangluo。fusheganraoshizhiganraoyuantongguokongjianbaqixinhaozuohe（ganrao）daolingyigedianwangluo。zaigaosuPCBjixitongshejizhong，gaopinxinhaoxian、jichengdianludeyinjiao、geleijiechajiandengdukenengchengweijuyoutianxiantexingdefusheganraoyuan，nengfashediancibobingyingxiangqitaxitonghuobenxitongneiqitazixitongdezhengchanggongzuo。shimeshixinhaowanzhengxing（signal integrity）？xinhaowanzhengxingshizhixinhaozaixinhaoxianshangdezhiliang。xinhaojuyoulianghaodexinhaowanzhengxingshizhidangzaixuyaodeshihou，juyousuobixudadaodedianyadianpingshuzhi。chadexinhaowanzhengxingbushiyoumouyidanyiyinsudaozhide，ershibanjishejizhongduozhongyinsugongtongyinqide。zhuyaodexinhaowanzhengxingwentibaokuofanshe、zhendang、didan、chuanraodeng。shimeshifanshe（reflecTIon）？fanshejiushizaichuanshuxianshangdehuibo。xinhaogonglv（dianyahedianliu）deyibufenchuanshudaoxianshangbingdadaofuzaichu，danshiyouyibufenbeifansheliao。ruguoyuanduanyufuzaiduanjuyouxiangtongdezukang，fanshejiubuhuifashengliao。yuanduanyufuzaiduanzukangbupipeihuiyinqixianshangfanshe，fuzaijiangyibufendianyafanshehuiyuanduan。ruguofuzaizukangxiaoyuyuanzukang，fanshedianyaweifu，fanzhi，ruguofuzaizukangdayuyuanzukang，fanshedianyaweizheng。buxiandejihexingzhuang、buzhengquedexianduanjie、jingguolianjieqidechuanshujidianyuanpingmiandebulianxudengyinsudebianhuajunhuidaozhicileifanshe。shimeshichuanrao（crosstalk）？chuanraoshiliangtiaoxinhaoxianzhijiandezuohe，xinhaoxianzhijiandehuganhehurongyinqixianshangdezaosheng。rongxingzuoheyinfazuohedianliu，erganxingzuoheyinfazuohedianya。PCBbancengdecanshu、xinhaoxianjianju、qudongduanhejieshouduandedianqitexingjixianduanjiefangshiduichuanraoduyouyidingdeyingxiang。shimeshiguochong（overshoot）hexiachong（undershoot）？guochongjiushidiyigefengzhihuoguzhichaoguoshedingdianya——duiyushangshengyanshizhizuigaodianyaerduiyuxiajiangyanshizhizuididianya。xiachongshizhixiayigeguzhihuofengzhi。guofendeguochongnenggouyinqibaohuerjiguangongzuo，daozhiguozaodishixiao。guofendexiachongnenggouyinqijiadeshizhonghuoshujucuowu（wucaozuo）。shimeshizhendang（ringing）he 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domain）hepinyu（frequency domain）zhijianyoushimebutong？shiyu（TIme domain）shiyishijianweijizhundedianyahuodianliudebianhuadeguocheng，keyiyongshiboqiguanchadao。tatongchangyongyuzhaochuguanjiaodaoguanjiaodeyanshi（delays）、pianyi（skew）、guochong（overshoot）、xiachong（undershoot）yijijianlishijian（settling TImes）。pinyu（frequency domain）shiyipinlvweijizhundedianyahuodianliudebianhuadeguocheng，keyiyongpinpufenxiyiguanchadao。tatongchangyongyuboxingyuFCCheqitaEMIkongzhixianzhizhijiandebijiao。shimeshizukang（impedance）？zukangshichuanshuxianshangshurudianyaduishurudianliudebizhi（Z0=V/I）。dangyigeyuansongchuyigexinhaodaoxianshang，tajiangzuaitaqudong，zhidao2*TDshi，yuanbingmeiyoukandaotadegaibian，zaizheliTDshixiandeyanshi（delay）。shimeshijianlishijian（settling time）？jianlishijianjiushiduiyuyigezhendangdexinhaowendingdaozhidingdezuizhongzhisuoxuyaodeshijian。shimeshiguanjiaodaoguanjiao（pin-to-pin）deyanshi（delay）？guanjiaodaoguanjiaoyanshishizhizaiqudongqiduanzhuangtaidegaibiandaojieshouqiduanzhuangtaidegaibianzhijiandeshijian。zhexiegaibiantongchangfashengzaigeidingdianyade50%，zuixiaoyanshifashengzaidangshuchudiyigeyueguogeidingdezuozhi（threshold），zuidayanshifashengzaidangshuchuzuihouyigeyueguodianyazuozhi（threshold），celiangsuoyouzhexieqingkuang。shimeshipianyi（skew）？xinhaodepianyishiduiyutongyigewangluodaodabutongdejieshouqiduanzhijiandeshijianpiancha。pianyihuanbeiyongyuzailuojimenshangshizhongheshujudadaodeshijianpiancha。shimeshixielv（slew rate）？Slew ratejiushibianyanxielv（yigexinhaodedianyayouguandeshijiangaibiandebilv）。I/O dejishuguifan （ruPCI）zhuangtaizailianggedianyazhijian，zhejiushixielv（slew rate），tashikeyiceliangde。shimeshijingtaixian（quiescent line）？zaidangqiandeshizhongzhouqineitabuchuxianqiehuan。lingwaiyebeichengwei “stuck-at” 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BUFFERkuaisuzhunquejianmodefangfa，shifanyingxinpianqudonghejieshoudianqitexingdeyizhongguojibiaozhun，tatigongyizhongbiaozhundewenjiangeshilaijiluruqudongyuanshuchuzukang、shangsheng/xiajiangshijianjishurufuzaidengcanshu，feichangshihezuozhendanghechuanraodenggaopinxiaoyingdejisuanyufangzhen。IBISbenshenzhishiyizhongwenjiangeshi，tashuomingzaiyibiaozhundeIBISwenjianzhongruhejiluyigexinpiandequdongqihejieshouqidebutongcanshu，danbingbushuomingzhexiebeijiludecanshuruheshiyong，zhexiecanshuxuyaoyoushiyongIBISmoxingdefangzhengongjulaiduqu。yushiyongIBISjinxingshijidefangzhen，xuyaoxianwanchengyixiasijiangongzuo。（1）huoquyouguanxinpianqudongqihejieshouqideyuanshixinxiyuan；（2）huoquyizhongjiangyuanshishujuzhuanhuanweiIBISgeshidefangfa；（3）tigongyongyufangzhendekebeijisuanjishibiedebujubuxianxinxi；（4）tigongyizhongnenggouduquIBIShebujubuxiangeshibingnenggoujin 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Emphasisdesuoxie。yingjiandiaoshijiqiaoyingjiandiaoshishiyinggaizhuyideyixiewenti。ruzaiyingjiandiaoshiqian，yingxianduidianlubanjinxingxizhidejiancha，guanchayouwuduanluhuoduanluqingkuang（youyuDSPdePCBbanbuxianyibanjiaomi、jiaoxi，zhezhongqingkuangfashengdegailvhuanshibijiaogaode）。jiadianhou，yingyongshouganjueshifouyouxiexinpiantebiere。ruguofaxianyouxiexinpiantangdelihai，xulijidiaodianzhongxinjianchadianlu。paichuguzhanghou，jiezhuojiuyingjianchajingtishifouzhendang，fuweishifouzhengquekekao。ranhouyongshiboqijianchaDSPdeCLK-OUT1heCLK-OUT2yinjiaodexinhaoshifouzhengchang，ruozhengchangzebiaomingDSPbenshengongzuojibenzhengchang。1baozhengdianyuandewendingkekaozaiDSPyingjianxitongdiaoshiqian，yingquebaogeishiyanbangongdiandedianyuanyoulianghaodehengyahengliutexing。youqiyaozhuyideshi，DSPderukoudianyayingbaochizai5.0V±0.05V。 dianyaguodi，zetongguoJTAGjiekouxiangFlashxieruchengxushi，huichuxiancuowutishi；dianyaguogao，zehuisunhuaiDSPxinpian。2fangzhenruanjianpaichuyingjianguzhangzaiwanchengduidianlubandejianchahou，jiuketongguofangzhenruanjianlaidiaoshichengxu。youyufangzhenshi，chengxudaimaxiazaidaomubiaoxitongzhongdepianwaichengxucunchuqi，yinertongguofangzhenruanjiankeyibijiaorongyidijianchachuyixieyingjianguzhang。zaishangdianhou，ruofangzhenruanjiandiaoshichuangkoushizhongwufadiaoruchengxu，zeyouliangzhongkeneng：① DSPxinpianyinjiaocunzaiduanluhuoduanluxianxiang；②DSP xinpiansunhuai。tangruoshidiyiciliyongfangzhenruanjiandiaoshichengxu，cishiyingduishiyanbanduandian，zixijianchaDSPxinpiangeyinjiaodehanjieqingkuang。ruguoruanjiandiaoshichuangkouzengzhengquediaoruchengxu，zekenengshiDSPxinpiansunhuai。cishi，ketongguojianceshiyanbandezhengbanzukangjinyibupanduanDSPxinpianshifoushousun。ruozhengbanzukangjijuxiajiang，kejianggeiDSPxinpiangongdiandedianyuanxiangeduan，jianceDSPxinpiandedianzu。ruguoruanjiandiaoshichuangkoukediaoruchengxu，dandiaorudechengxujubuchucuo，ruduipianwaichengxucunchuqihuoshujucunchuqicaozuodedaimabiancheng.word xxxx，cishikenengshipianwaichengxucunchuqihuoshujucunchuqichuxianguzhang。yingzixijianchacunchuqishifoucunzaiduanluhuoxuhan，ruobucunzaizeyingjinyibupanduancunchuqishifoushousun。【ruguonixihuanEDA365dewenzhang，jideguanzhuhedianzano！】7yue14ri xingqiri
就(闯颈耻)算(厂耻补苍)是(厂丑颈)平(笔颈苍驳)时(厂丑颈)，儿(贰谤)子(窜颈)对(顿耻颈)父(贵耻)母(惭耻)的(顿别)态(罢补颈)度(顿耻)，跟(骋别苍)女(狈惫)儿(贰谤)也(驰别)完(奥补苍)全(蚕耻补苍)不(叠耻)一(驰颈)样(驰补苍驳)。
今天，阳光穿透云层，为大地铺上了金黄的地毯，陈耀轩独自一人坐在窗边，看着院子里风中摇曳的柳枝，一种说不清的落寞在胸中蔓延。杨晓梅推开门进来，手中提着一个装满菜籽油的提篮。北京时间2024年7月12日19:35分，中超第19轮的比赛继续进行，由第1的上海海港迎战第4的北京国安，本轮对决是上海海港豪取13连胜还是北京国安终结海港12连胜呢？钱盛于糖小说冲钱盛于糖的小说全文免费在线阅读冲瑞文...
乐通股份3月7日晚间公告公司拟以13.46元/股向优悦美晟发行股票募资不超1.4亿元扣除发行费用后将用于偿还债务及补充流动资金优悦美晟为公司控股股东大晟资产的全资子公司