This has the effect of reducing power consumption on the system while still delivering peak performance.
这可以在保持最高性能的同时减少系统的电力消耗。
We have one organism that lives off of carbon monoxide, and we use as a reducing power to split water to produce hydrogen and oxygen.
有种依赖一氧化碳生存的生物，我们利用其还原能力使水分子破裂，制造出氢和氧。
Keeping soldiers on the ground better connected to their team members and commanders while reducing power consumption and extending battery life is the HMS mission.
HMS无线电的目的是保持地面士兵更好地连接到他们的部队和指挥官，同时降低功耗并延长电池寿命。
A new network design that avoids the need to convert optical signals into electrical ones could boost capacity while reducing power consumption.
一种无需将光信号转换为电信号的联网设计可能大幅提升容量，同时降低功耗。
Reducing power consumption by monitoring application usage can take many forms.
通过监视应用程序使用情况来降低功耗可以采取许多形式。
Techniques for reducing power usage during data transmission
数据传送中的节电技术
Meanwhile, onion peel flavonoid has stronger reducing power when comparing to tea polyphenol.
同时洋葱皮黄酮还原能力较强，高于茶多酚。
But Madhusudan relented and let me off with just a taste of his pride-reducing power.
但是马都苏丹大发慈悲，只用他一点儿贬损骄傲的能量，就把我放过了。
The key technology and its solution method were probed in design from avoiding warn-omitted, enhancing reliability of system and reducing power wastage.
从防止漏报警、提高系统可靠性和降低系统功耗三个方面探讨了设计中涉及到的关键技术及其具体解决方法。
The antioxidant activity of Limonium sinense(Girard) Kuntze root extract was examined using various antioxidant assays, such as reducing power, DPPH assay, TEAC assay, lipid peroxidation.
利用不同的方法（还原能力、DPPH法、TEAC法和脂质体过氧化）评价了中华补血草根提取物的抗氧化活性，同时测定了其总酚、黄酮和原花青素的质量分数。
It has excellent optical character and pigment performance, high purity, whiteness, tint reducing power and dispersibility.
它具有优良的光学性质和颜料性能，纯度高，白度，色彩还原能力和分散性。
Both Zophobs morio L hydrolyzate and purified-polypeptide has some reducing power, and appeared good linear relationship.
水解液及纯化后多肽具有一定的还原能力，且呈良好的线性关系。
This product can multiple with coal mine transformer use, improving the pf to above 0.95 while reducing power loss, improve safety, promoting mining equipment working production.
该产品可以与煤矿井下移动变电站或者干式变压器并联使用，提高井下电网功率因数至0.95以上，减少电能损耗，提高井下设备安全性，促进采掘工作的生产。
The reduction in size of components and circuits for increasing package density and reducing power dissipation and signal propagation delays.
减少元件和电路的几何尺寸，以达到增加电路的封装密度、减少功耗和减小信号传播延迟的目的。
Low power loss is the key of loop powered transducer design. The methods for reducing power loss are discussed in this paper.
总线供电的变送器设计中的关键问题是降低功耗，文中讨论了关于降低功耗方面的几个问题。
Based on the quality of linear operation about indefinite integral, the article puts forward an indefinite integral principle of making linear combination and reducing power of integrand.
从不定积分的线性运算性质出发，给出了计算不定积分的被积函数线性组合化、降幂的积分原则，并结合实例分析了这一原则在不定积分计算中的指导作用。
Philipp Karch , from BITKOM, says new technology can help in reducing power consumption.
电信产业协会的飞利浦卡契说，新的科技能够帮助耗电量的减低。
In addition, as the result of optimizing ALU, system resources are saved and parasitic capacitance is minimized, and the aim of reducing power consumption is achieved accordingly.
另外，通过对算术逻辑单元进行优化设计，节省了系统的资源，减小了电路的寄生电容，从而达到了降低功耗的设计目标。
Dynamic compensation on the spot is one of the best manner of reducing power network loss, enhancing its transmission efficiency.
动态就地补偿是降低电网损耗，提高输配电效率的最佳方式之一。
Reducing power consumption to extend network lifetime with limited energy resource is one of the most important challenges in industrial wireless networks.
在能量有限条件下通过降低能耗来延长网络生存时间是工业无线网络面临的重要挑战之一。
SOI (Silicon On Insulator) used for integrated circuit (IC) manufacturing has two advantages of increasing speed and reducing power consumption.
绝缘层上硅）硅片用于制造集成电路具有高速、低功耗、集成度高等优势。
Reducing power, metal chelating ability and metal contents of the pure natural melanin from Osmanthus fragrans' seeds was studied.
对桂花种子皮黑色素的还原性、金属鏊合性能进行了研究，并测定了其金属含量。
Reactive power compensation which is abroad used in the end of lines and large corporations have good effects in reducing power losses.
无功补偿广泛应用于线路末端和大型厂矿企业，能很好地降损增益。
Any PC manufactured after 2000 should provide hardware and software capable of reducing power consumption.
年以后制造的所有PC都应当能够提供降低功耗的硬件和软件。
The topics covered include recommentation of memory devices for these applications, methods for reducing power consumed and detailed analysis for relative circuits.
文中简介了适用于这种场合的几种存贮器件，提出了降低功耗的措施，分析了有关电路。
We propose that NTRC constitutes an alternative system for chloroplast protection against oxidative damage, using NADPH as the source of reducing power.
我们认为NTRC利用NADPH作为还原力来源，形成了保护叶绿体免受氧化伤害的替代系统。
A certain positive correlation exited between reducing power and vitamin C content and flavonoids content respectively.
沙棘酒还原力与维生素C含量和总黄酮含量间均呈正相关关系。
Its function is storing pressure, reducing power consumption.
有储蓄能量、稳定压力、减少电耗等功能。
Its function is storing pressure, reducing power consumption.
有储蓄能量、稳定压力、减少电耗等功能。
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& 在基于LFSR重播种的压缩环境下同时降低测试数据量和测试功耗
在基于LFSR重播种的压缩环境下同时降低测试数据量和测试功耗
半导体学报-2011.7
Vol.32,No.7JournalofSemiconductorsJuly2011
Reducingtest-datavolumeandtest-powersimultaneouslyinLFSRreseeding-basedcompressionenvironment
WangWeizheng(王伟征),KuangJishun(邝继顺)
,YouZhiqiang(尤志强),andLiuPeng(刘鹏)
CollegeofInformationScience&Engineering,HunanUniversity,Changsha410082,China
Abstract:Thispaperpresentsanewtestschemebasedonscanblockencodinginalinearfeedbackshiftregis-ter(LFSR)reseeding-basedcompressionenvironment.Meanwhile,ourpaperalsointroducesanovelalgorithmofscan-blockclustering.Themaincontributionofthispaperisaflexibletest-applicationframeworkthatachievessignificantreductionsinswitchingactivityduringscanshiftandthenumberofspecifiedbitsthatneedtobegener-atedviaLFSRreseeding.Thus,itcansignificantlyreducethetestpowerandtestdatavolume.ExperimentalresultsusingMintesttestsetonthelargerISCAS’89benchmarksshowthattheproposedmethodreducestheswitchingactivitysignificantlyby72%C94%andprovidesabestpossibletestcompressionof74%C94%withlittlehardwareoverhead.
Keywords:built-inself-LFSRscanblockDOI:10.26/32/7/075009EEACC:1265A
tionaltoSmaxandcanapproximatethetotalnumberofspeci-fiedbitsinallofthetestcubesinthetestset.
AlthoughtheLFSRreseedingschemeisanefficientmethodfortestdatacompression,itmaycauseexcessivepowerconsumption.Ifthedon’tcarebitsintestcubesarefilledwithpseudo-randombitsgeneratedbyanLFSR,therewillex-istaverylargenumberoftransitionsinthecircuitundertest(CUT)duringscan-shiftoperations.FordeterministicBIST,severaltechniquesforreducingbothswitchingactivityandtestdatavolumehavebeendeveloped.ThelowpowerschemesbasedonscansliceoverlappingwereproposedinRefs.[9,10].Intheseschemes,eachpatternispartitionedintoseveralover-notransitionisproducedandnospecifiedbitsneedtobegeneratedviaLFSRreseedingintheoverlap-pingblock.Leeetal. 11
presentedascantestschemeusingholdcubes.Inthisscheme,eachtestcubeisdividedintosev-eralblocks.Ifnotransitionoccursinablockandthedatabitsoftheblockarecompatiblewiththelastbitofthepreviousblock,thescan-indatafortheblockaresimplykeptconstantfromthelastdatabitinthepreviousblock.Boththetestdatavol-umeandtheshiftpowercanbereducedtosomeextent.Sinceadatablockbecominganon-transitionalblockislimitedbythepreviousdatablock,itsefficiencyiscompromised.
However,thetechniquesmentionedabovecannotconsidertogethertheproblemsoftest-datacompressionandlow-powertestwellorhaveonlylimitedeffectiveness.Inthispaper,wepresentanewtestschemebasedonscanblockencodingforde-terministicBIST.Theencodingalgorithmproposedinthispa-perhassomesimilaritytothealgorithmpresentedinRef.[11].Bothencodingalgorithmsdividethescanchainsintoblocksandidentifydatablocksthatdonotcontaintransitions.How-ever,theyhavealargedifference.Intheproposedapproachadatablockbecomingnon-transitionalblockisnotlimitedbythepreviousdatablockandthusitprovidesamoreflexiblemechanismforsimultaneousreductionsintransitionsduring
1.Introduction
Withtherapiddevelopmentofverylargescaleintegration(VLSI)technology,thetransistorcountperchipincreasesex-ponentiallyandthetestingforintegrationcircuits(ICs)isget-tinghardtomanage.Thegrowingtest-datavolumeincreasestestcostduetohighautomatic-test-equipment(ATE)memoryrequirementsandlongtesttime.Inaddition,thepowercon-sumedduringtestmodeisoftenmuchhigherthanthatduringnormalmode 1
.Prohibitivelyhighpowerdissipationmayleadtoincreasednoise,IR-drop,overheating,andsoon,resultinginundesiredyieldlossandreliabilityproblems 2
Built-inself-test(BIST)isapowerfulsolutionfortestingtheindividualintellectualproperty(IP)coresinsystem-on-a-chip(SOC)designs 3;4
.Recently,testcompressionschemesbasedonLFSRreseeding,whichcanprovideveryhightestcoverageandconsumearelativelyshorttesttime,havebeenwidelyresearched.Intheseschemes,deterministictestpatternsaregeneratedbyexpandingLFSRseeds.Theseedcorrespond-ingtoagivendeterministictestcubecanbecomputedbysolv-ingasystemoflinearequations(oneequationforeachspeci-fiedbit)determinedbythefeedbackpolynomialofanLFSR.LFSRreseedingmethodologywasfirstintroducedtocompresstestdatainRef.[5].Itisshownthatinordertomaketheprob-abilityofnotfindingasolutionforthesystemoflinearequa-tionslessthan10
6,thelengthofLFSRshouldbelargerthanSmaxC20,whereSmaxisthelargestnumberofspecifiedbitsinanytestcubeinatestset.ToimprovetheencodingefficiencyintheLFSRreseedingscheme,multiple-polynomialLFSRsorvariable-lengthmultiplepolynomialLFSRsareusedsothatthetotalbitsofseedscanbereducedfurther 6;7
.DynamicLFSRreseedingwasstudiedinRef.[8].PartialdynamicformofLFSRreseedingwasstudiedinRef.[8].Inthismethod,thenumberofbitsrequiredforencodingatestsetisnotpropor-
*ProjectsupportedbytheNationalNaturalScienceFoundationofChina(Nos.73207).
Correspondingauthor.Email:jshkuang@
c2011ChineseInstituteofElectronicsReceived11December2010,revisedmanuscriptreceived5March2011
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