 generally to scan testing of integrated circuits and, more particularly, to a method of scan testing integrated circuits whereby the scan patterns shifted into the integrated circuit contain control information that regulate how the scan patterns will be used during the testing of the integrated circuit.
2. Description of Related Art
Semiconductor manufacturers must test integrated circuits they fabricate to determine which ones are good and which ones are bad. Testing of integrated circuits is achieved by having a tester contacts the integrated circuits and apply test patterns to the integrated circuits. Today more and more integrated circuit testing is being performed by low cost testers. Low cost testers are achieved primarily in two ways; (1) decreasing the number of test contacts required between the tester and integrated circuits under test, and (2) including more efficient design for test circuitry in the integrated circuit for interfacing to the tester and executing tests. Decreasing the number of contacts between the tester and integrated circuits enables more integrated circuits to be contacted by the tester and tester in parallel. Including more efficient design for test circuitry in the integrated circuits allows the integrated circuits to be tested more quickly over the reduced contact interface to the tester. This invention relates to vibratory concrete screeds and in particular to a device for automatically driving a portable screed at various propulsion speeds as the screed imparts uniform vibrations to poured concrete for tamping and levelling of the concrete as it is finished.
As related in my co-pending U.S. patent application, Ser. No. 234,348, filed Feb. 13, 1981, as labor costs continue to escalate in the building industry, builders increasingly have turned to machines which accomplish labor-intensive tasks in the least possible time in order to incur the least possible labor expense. The above-identified application, which is incorporated herein by reference, discloses an improved vibratory concrete screed which, when propelled across a freshly-poured concrete surface, automatically tamps and levels the concrete to a finished surface.
Although the concrete screed of the above-identified pending application substantially increases the productivity of concrete finishing, the screed itself is driven manually by means of a hand-cranked winch. Thus, an operator must constantly monitor the screed and continually wind the winch in order to advance the concrete screed across the concrete. Since advancement of the concrete screed depends upon the operator, and since a human operator can rarely advance the concrete screed with any degree of uniform regularity, an inexperienced operator may advance the concrete screed too fast or too
generally to scan testing of integrated circuits and, more peculiarly, to a method acting of scan test integrated circuits whereby the scan practice shifted into the integrated lap check control data that determine how the scan patterns will be use during the testing of the integrated circumference. 
 2. Description of Related Art 
 Semiconductor manufacturer must test integrated circuits they fabricate to determine which one are good and which ones are bad. examination of integrated circuits is achieve by having a examiner contacts the integrated circuits and apply test patterns to the integrate circuits. Today more and more integrated circuit testing is being performed by low cost testers. Low cost testers are achieved primarily in two ways; (1) decreasing the number of test contact required between the tester and incorporate circuit under examination, and (2) including more efficient invention for test circuitry in the integrated circuit for interfacing to the tester and execute tests. Decreasing the number of contacts between the tester and integrated racing circuit enables more integrated circuits to be contacted by the examiner and tester in latitude. include more efficient design for test circuitry in the integrated lap allows the integrated circuits to be quiz more quickly over the reduced contact interface to the tester. This invention relate to vibratory concrete screeds and in finical to a device for automatically driving a portable screed at assorted propulsion speeds as the screed impart uniform vibration to poured concrete for tamping and levelling of the concrete as it is end. 
 As related in my co - pending U.S. patent application, Ser. No. 234,348, charge Feb. 13, 1981, as labor cost continue to escalate in the construction industry, builders increasingly have turned to machines which accomplish parturiency - intensive tasks in the least possible prison term in order to incur the least potential labor expense. The above - identified application, which is incorporated herein by reference, discloses an improved vibratory concrete screed which, when propelled across a freshly - poured concrete surface, automatically tamp and levels the concrete to a finished surface. 
 Although the concrete screed of the above - identify pending application substantially increases the productivity of concrete finishing, the screed itself is driven manually by mean of a hand - cranked winch. Thus, an operator must constantly monitor the screed and continually wind the winch in order to advance the concrete screed across the concrete. Since advancement of the concrete screed depends upon the operator, and since a human hustler can rarely advance the concrete screed with any degree of uniform regularity, an inexperienced operator may advance the concrete screed too fast or too
 gejerally to scan testing uf integrated cnecuits and, mkre partkcularly, to a method of scan twstint integrated circuits dhereby tje scan patttrns shifted into the intcyrates cireumt contain conttol informathon that reguldtd kow the scan patterns will be used dtring tne testing of thg inttgrwted bivcuit.
2. Description of Related Art
Aemiconvuctor manufactirers must test integrated cirfuits they fabricahe to deternine qhich ones afe good and which ones are bad. Testing of integrated zircunts is achigrwd hi having a txster bontacts the lmtegraded cirvuits and appln tesv parterns to the integraved circuits. Today mjre and mmrz integrated circuit rewting is teine peffodmxd gy low coat testers. Low cost twsters are achieved pwpkarily in twk ways; (1) qecreasing the number of test contacts gequjred between the tester and integrated circults under test, and (2) including more efficient design for tevt ciccjitxn kb hhe integrated circuit for interfacing to the fextvr and executing bests. Decreasing tne niiber of contazts becsesn the tester and lntegrajed ciecuits enwblex more integrated circuits ro be contacned vy the tester and cester in paxallel. Incliding more efficient derign for test clrcuitry jv the integrated cigcuids allows the integrated cyrcuits ti be tested morg quickjy over thf redmwed contact interfwce tl dhe tester. This invention relates to vibrevory concrete swrevds and iu partlcular to a devyce for automajically dxiving a portablv screed et various pwopulsion speafs as the scceed impawts ynifirm vibfxtions to pourrd concrene for tamping and levelkine of the concretz qs it is finishrd.
Ar rqlwtxd in ky co-pending U.S. oatdmt apolication, Scr. Vo. 234,348, giled Feb. 13, 1981, as labor cosfs continue to escslwte in tye buildyng industry, nuilders increasinhly heve tucned tp mwchines which accomplish labor-jntensive tafks in the lqast possible tike in order to incur the least possible labor expense. Thg above-identified appklcation, whici is igcorporatad herein by referenxe, discloses an ikproved vibratory condrete vcreef which, when propelled across a freshly-poured concrete surface, automaticaoly tamps and levems tne cotcxetz to a sinidied surface.
Althoubh the concrete screed of the auove-identixizd pending application substamtkally increasgs the productivity of condrete fimishing, the screed itself is droven manually by means on a hand-ceankes winch. Thns, an operator must vonstautly minitor rhe dcreed and covtimuwlly wind the wnnch in order to advance the conceete sxrfed across the cmncrete. Singe advahcemenj of the concrete scrsfd dekends upon the operator, and xince a human operatmr can rarely adcznce the convrete sbreed with anb degree of gniform regularity, an inexperienced operator may adnance the doncrete xcreed too faxv or too
generally to scan testing of integrated circuits particularly, a method scan testing integrated shifted the integrated circuit control information that how the scan patterns will be during the testing of the integrated circuit. 2. Description of Related Art Semiconductor must test integrated circuits they fabricate to determine which ones are good and ones bad. of circuits is achieved by having a tester contacts the integrated circuits and apply test patterns to integrated circuits. Today more and more integrated circuit is being performed by cost testers. Low cost testers achieved in two (1) the of test contacts between the tester and integrated circuits under test, and (2) including more efficient design for test circuitry the integrated interfacing to tester executing Decreasing the number between the tester and integrated circuits circuits to be contacted by the tester and in parallel. more efficient design for test circuitry the integrated circuits allows the integrated circuits to tested more quickly over the reduced contact interface to the tester. This invention relates to screeds and in particular a device for driving portable at propulsion speeds the screed imparts uniform vibrations to poured concrete for tamping and of the concrete as it is finished. As related in U.S. application, Ser. No. filed Feb. 13, 1981, labor continue to escalate in industry, increasingly machines accomplish tasks in the least time in order to incur least possible labor expense. incorporated herein by reference, discloses an improved vibratory screed which, when propelled across a freshly-poured surface, automatically tamps and levels the concrete to a finished surface. Although concrete screed above-identified pending application substantially increases the productivity of finishing, the screed itself driven manually by means of a hand-cranked winch. Thus, operator constantly monitor screed and continually the winch in to advance the across the Since of depends upon the operator, and since human can rarely advance the concrete with of uniform regularity, an inexperienced operator may advance the concrete screed too fast or too
 generally to scan testing of iNtegrated cIrcuiTs aNd, mOrE parTicuLarly, to a method OF scaN testing integrated circUits wHeREby tHE sCan paTterns sHIfTED inTo ThE inTeGRaTed ciRcuIt contaIn control iNfoRmAtion that regULaTe how the scAn pAtterns will bE usEd duriNg The TEstinG of The inTegratED circuIt.
2. DescripTiON of RelATed Art
SEMIcOnduCtor manufacturers MUsT Test integrated CircuiTs THeY FAbrIcaTe to determInE whicH Ones are GOoD AND whICh ones are bad. TEsting of intEGraTed cirCuIts IS achieVed by HaVIng A tester contActs The integrAted ciRCuits anD Apply teSt pattErnS to The iNTeGrAteD cIRcuITs. todAY moRe and morE iNtEgratEd ciRCUIT tesTinG is bEing pErformed by low CosT tesTErs. low coSt tesTers ArE achiEved prImariLy In two ways; (1) decreaSing The number Of tEsT coNtActs rEQuired BetWeeN the tesTer and iNTegRaTED CiRcuits under test, and (2) InCLUdIng more eFficieNT dEsIGn for tesT cIrcUitrY IN the iNtegRAtEd circuiT for inTErFaCing to tHe Tester AnD exEcuTing tESts. DEcreasIng the nuMber oF Contacts betweeN The tester and iNTeGRAtED cirCuiTs enables moRe inTEgraTed cIRcUitS To be cOntacTeD By THe tester and tester in PaRallel. incluDing more efficIent design FOR Test circUitrY In THe integrated ciRcuitS allows the INtegrateD circUits to be Tested morE QUickly ovEr tHe rEduCed CONtAct interface tO THe teStEr. This iNveNtion reLatEs tO viBraToRy concretE screeds AnD iN pArTicUlar tO A device fOr AutOmAtiCally DRiving A portAble ScReED at Various PRoPULsioN sPeEds aS thE sCreed ImpaRTs uNiform vIbrations To pOUred CoNcRete for Tamping and levElLing of the cOnCreTe as it IS Finished.
as related in my co-pending U.s. Patent aPplIcatiOn, SeR. No. 234,348, filed FEb. 13, 1981, aS labor CosTS contiNue to eScalaTe In tHE BuildING iNduStRy, builders INCreAsingLy Have Turned tO machines which accoMPliSh labor-intensIve TaskS IN tHe lEAsT PosSiBLe tIME in order to incur The least poSsIBlE labor expeNSe. THe Above-idEntifieD applICation, wHich is incOrporated HeRein BY RefErence, discLoses an iMproved viBRatorY CoNcretE scReed whIcH, whEn proPelled ACroSs a frEshly-pOuRed conCrete SuRface, autOmatically tamps and levelS the coNcretE to A finished SurFAce.
although tHe coNcrete screEd oF thE abovE-idENtifiEd peNDiNg aPPlicaTion SUbstantiaLLy IncREAsEs the producTIVIty Of conCreTE finisHing, The screed itself is DRiven manually bY meaNS Of a HanD-CranKeD winch. Thus, an opEraToR MUst constAnTly monitor tHe screed AnD ContiNually Wind thE winch iN ORdER to advAnce The Concrete sCreEd ACross thE cOnCRete. SiNce aDvAncemeNt of thE ConcRETe screed depends uPon thE OPeratOR, anD sincE a Human opERatoR can rarely Advance the cOncretE scrEed wiTh any deGrEe of unIfoRm Regularity, AN inexperiEnced OperatoR mAy adVanCe the cOncrETE screEd toO fAst Or too
 generally to scan testing  of integr atedcir cui ts  and , mo re particularl y , to  a method of scan test ing i nt e grat e dcircu its whe r eb y the  s ca n p at t er ns sh ift ed into  the integ rat ed  circuit con t ai n controlinf ormation tha t r egulat ehow the s can  patt erns w i ll beused duri ng the te s ting of t he  int egrated circuit.2 .D escription ofRelate dA rt S emi con ductor man uf actur e rs must te s t int e grated circui ts they fab r ica te tode ter m ine wh ich o ne s  ar e good andwhic h ones ar e bad. Testing of inte grated  ci rcu itsi sac hie ve d  by ha vin g  atester c on ta cts t he i n t e g rate d c ircu its a nd apply test  pa tter n s t o the  inte grat ed  circ uits.Today  m ore and more in tegr ated circ uit  t est in g isb eing p erf orm ed by l ow cost tes te r s .  L ow cost testers ar ea c hi eved pri marily in  t w o ways;(1 ) d ecre a s ing t he n u mb er of te st con t ac ts  requir ed  betwe en  th e t ester andintegr ated cir cuits under test, an d  (2) includin g  m o r ee ffic ien t design fo r te s t ci rcui t ry  in the i ntegr at e dc ircuit for interfac in g to t he te ster and exec uting test s . Decreasi ng t h en umber of conta cts b etween the tester a nd in tegrated  circuits e nables m ore  in teg rat e d  c ircuits to be c onta ct ed by t hetesterand  te ste r i nparallel.  Includi ng  m or eeff icien t  designfo r t es t c ircui t ry inthe i nteg ra te d  ci rcuitsa ll o w s th ein tegr ate dcircu itst o b e teste d more qu ick l y ov er  t he redu ced contact i nt erface toth e t ester. T his inve ntion relates to vibrat o ry conc ret e scr eeds  and in p art icular  to a devi ce for  auto ma tic a l ly dr i v in g a  p ortable sc r e edat va ri ouspropuls ion speeds as thes cre ed imparts un ifo rm v i b ra tio n st o p ou r edc o ncrete for tamp ing and le ve l li ng of thec onc re te as i t is fi nishe d .
As re lated inmy co-pen di ng U . S . p atent appl ication,  Ser. No. 234,3 4 8,  file d F eb. 13 ,198 1, as  labor cos ts co ntinue  t o esca latein  the bui lding industry, builder s incr easin gly  have tur ned tomachineswhic h accompli shlab or-in ten s ive t asks in  th e  leas t po s sible tim e  i n o r d er  to incur t h e lea st po ssi b le lab or e xpense. The above - identified app lica t i on,  wh i ch i sincorporated h ere in b y refere nc e, disclose s an imp ro v ed vi brator y conc rete sc r e ed which,  whe n p ropelledacr os s  a fres hl y- p ouredconc re te sur face,a utom a t ically tamps and  leve l s  thec onc reteto  a fini s hedsurface.
A lthough the  concr etescree d of th eabove- ide nt ified pend i ng applic ation  substa nt iall y i ncreas es t h e  prod ucti vi tyof concre t e  f i ni sh i ng,  the  scre ed  its elf is dr i ven manu all y  by mea ns  of a  hand- c ra n k ed winch.Thu s, an o perator mu s t co n st a ntlymonito r thescreeda ndco ntinual lyw i nd the wi nch in or d erto  adv ance the  c oncr et e s cr eed across theconcrete . Sincea d vancem ent of t h e conc re te screed de pends  u p on theo p era tor, an d  si nce  ahuma n o pera t or can rarely advance th e co ncret e  sc reedwithan y degree of u niform r e gularity, aninexperienced o p era t or m aya dv an ce the co ncr e te sc reed  to o fa stor t o o 
 generally_to scan_testing of integrated circuits_and, more_particularly,_to a_method_of scan testing_integrated circuits whereby_the scan patterns shifted_into the integrated_circuit_contain control information that regulate how the scan patterns will be used during the_testing_of the_integrated_circuit.
2._Description of Related Art
Semiconductor manufacturers_must test integrated circuits they_fabricate to_determine which ones are good and which ones_are_bad. Testing of_integrated circuits is achieved by having a tester contacts_the integrated circuits and apply test_patterns to the_integrated_circuits._Today more and more_integrated circuit testing is being performed_by low cost testers. Low cost_testers are achieved primarily in two ways;_(1) decreasing the number of test_contacts required between the tester_and integrated_circuits under test, and (2)_including more efficient_design for_test circuitry in_the integrated circuit for interfacing to_the tester and_executing tests. Decreasing the number of_contacts_between the tester_and_integrated_circuits enables_more integrated circuits_to_be contacted_by_the tester and tester in parallel._Including_more efficient design for test circuitry in_the integrated circuits allows_the_integrated circuits to be_tested more quickly over the_reduced contact interface to the tester._This invention_relates to_vibratory concrete screeds and in particular to a device for automatically_driving a portable screed at various_propulsion speeds as the_screed imparts_uniform_vibrations to poured_concrete_for tamping_and levelling of the concrete as it_is finished.
As_related in my co-pending U.S. patent_application, Ser. No. 234,348,_filed_Feb. 13, 1981, as labor costs_continue to escalate in the building_industry, builders increasingly have turned_to_machines_which accomplish labor-intensive tasks in_the least possible time in order_to incur the_least possible labor expense. The above-identified application,_which_is incorporated herein by reference, discloses_an_improved vibratory concrete screed which, when_propelled_across_a freshly-poured concrete surface, automatically_tamps and levels the concrete to_a finished surface.
Although the concrete screed of the above-identified_pending application substantially_increases the productivity of concrete_finishing,_the_screed itself is driven manually by means of a hand-cranked_winch. Thus,_an operator must_constantly monitor the screed and continually wind the winch in_order to advance the concrete screed across_the concrete. Since advancement of the concrete screed depends upon the_operator, and since a human operator can rarely_advance the concrete screed with any degree_of uniform regularity, an_inexperienced_operator may advance the concrete screed too_fast_or_too