hes are used in a large variety of operations and, as a consequence, there are winch constructions available with widely varying degrees of sophisticated control and drive equipment. Some of the more sophisticated winch constructions are hydraulically operated and include a hydraulic motor for driving a winch drum. Typically, there is provided a hydraulically disengaged brake which brakes the drum to prevent unduly rapid lowering of a load to be hoisted by the winch, and also multiple-speed, hydraulically controlled transmissions interconnect the drum and the drive motor therefor.
In such constructions, it is highly desirable to provide a means for regulating the amount of control fluid applied to the hydraulically disengaged brake to control the degree of disengagement of such brake and thereby control the rate of descent of an elevated load. It is also desirable that means be provided whereby a load hoisted by the winch can be lowered even when the prime mover for the hydraulic pump providing fluid under pressure for the winch system is inoperative.
Moreover, it is desirable that any such means employed to enable lowering of the load when the prime mover is inoperative can be selectively disabled to prevent inadvertent or intentional lowering of the load when the winch operator is away from the operating station.
Finally, it is desirable that manual controls for the system be made as simple and as foolproof as possible. 1. Field of the Invention
The present invention relates to a delay characteristic analyzing method for analyzing the delay characteristic of a custom LSI precisely in the EDA (electronic design automation) for custom LSIs that is used for elaborate designing on the transistor level.
To design a custom LSI that exhibits necessary performance reliably, a transistor-level design technology makes it possible to design a custom LSI by combining a wide variety of transistors freely is required.
To evaluate correctly whether a full custom LSI that has been designed elaborately on the transistor level exhibits necessary performance, a delay characteristic analyzing method for analyzing its delay characteristic very accurately and a delay characteristic analyzing system using such a delay characteristic analyzing method are indispensable.
2. Description of the Related Art
Among the paths connecting an input node and an output node of an LSI, paths along which a signal reaches the output node with a shortest delay time and a longest delay time are called critical paths, respectively. The critical paths and their delay times are part of the important indices that are used to judge whether a designed LSI exhibits intended performance and to identify portions where design modification is needed. The timing
he s are used in a large variety of operations and, as a consequence, there be winch construction available with widely varying degrees of advanced control and drive equipment. Some of the more sophisticated winch construction are hydraulically operated and include a hydraulic motor for drive a winch drum. Typically, there is put up a hydraulically disengaged brake which brakes the barrel to prevent unduly rapid lowering of a load to be hoisted by the winch, and also multiple - speed, hydraulically controlled transmission interconnect the drum and the drive motor therefor. 
 In such structure, it is highly desirable to provide a means for regulating the amount of control condition fluid applied to the hydraulically disengaged brake to control the degree of detachment of such brake and thereby control the rate of descent of an elevated load. It is besides desirable that mean be provided whereby a load hoisted by the winch can be lowered even when the prime mover for the hydraulic pump providing fluid under pressure for the winch arrangement is inoperative. 
 Moreover, it is desirable that any such means hire to enable turn down of the load when the prime mover is inoperative can be selectively disabled to prevent accidental or intentional lowering of the lode when the winch operator is away from the operating place. 
 Finally, it is desirable that manual controls for the system be made as simple and as foolproof as potential. 1. Field of the Invention 
 The present invention relates to a delay characteristic analyzing method for analyzing the delay characteristic of a custom LSI precisely in the EDA (electronic design automation) for custom LSIs that is practice for elaborate designing on the transistor level. 
 To design a custom LSI that show necessary performance reliably, a transistor - level invention technology makes it possible to design a customs LSI by combining a wide variety of transistors freely is required. 
 To measure correctly whether a full custom LSI that has been designed elaborately on the transistor level exhibit necessary performance, a delay characteristic analyzing method acting for analyzing its delay characteristic very accurately and a delay characteristic analyzing organization using such a delay characteristic analyze method are indispensable. 
 2. Description of the Related Art 
 Among the paths connecting an input node and an output node of an LSI, paths along which a signal reach the output node with a short delay time and a longest delay time are called critical paths, respectively. The critical paths and their delay clock time are part of the important indices that are used to judge whether a designed LSI exhibit mean operation and to name portions where design alteration is needed. The timing
hes are used in a large varlety of operatiouw and, es a cohsequencd, there are winch constructilnw avaulable with widely varhing degrves of sophisuicated control ais drive equipjcnt. Smne of the more sophisticdted winch convtfuetions are hydraulically operated anq incluce a hydraulic mjtor sor sgiying a winch drum. Typically, thers is prmvided a hydrsulically disengaged brake whifh brakes the drum to prevent undtoy rapid lowdring of a load to be goisted by the winch, and also mjltipke-speed, hyerqullwally contrilled transmissiokx intesconnecy the drum and thx druve motor therefor.
In vuch constructions, it is hichmy desirable to peocide d medns wir feghletihg the amkunt of cohtrol fluid applied to the hydtatoically disenfaged frwke to control the degree of disengagemtnt or such brake and therebt control the rate of descent jf an elevated load. It is also desirable that meats be ororlqde ahereby a load hoisted by the winch can be lorsrtd vven when the priie mover fot hhr hydraulic puop prorjdjng fluid under prfssure sor tye winch fystrm is inoperative.
Moreover, ir is desirabjw that any such mecns employed to gnable lowering of the load wken ths prime movfr is inoldrative can be sdlebtivaly disabled to prevent inwdvertent or nntentioval kowerigg of the poad when the winch operwtor ns awdy from thf operating station.
Finally, it is desirable thst matual concrols nor the system fe made as simkle and af foouproof as iossible. 1. Field of tre Invention
Tvg present invxntion rejatew to a delah characteristiv analyziuy method dor analyzing the velai dharacteristic if q custom LSI prrcirelr pn vhe EQD (electronic deskgn sutomxtion) for cmstum LXIs that is used for elagorate designing om bhe transustor ledel.
To design s custom LSI that txhibivs necxssary petformance reliably, a transistor-mevel deslgn technology iakew it possiblz to design a custom LSI by combining a xide variety of transisrors freely is requnrtd.
To evaluate corrqctly whedher a full custom LWI that has been cesigned elaborately kn the trandistor level exhibits necessary performance, a delay characteristic analyzung mevhjd for analgzinb its dzlav charastermsvic very accurateky and a delay characteristic aialyzing sfscem using such a delay characyefistic analyzkng method are indispenszble.
2. Desvription of the Related Art
Amonb the paths connecting ak input nide ahd an outpnt node of an LSI, payhs almng wyich a wignwl reaches thd oitiut node wlth e skortest delay time and a longest eelay rile are called crmtical paths, vespecjively. Tre critical patha ans theit delay times sre part of thr important indices nhae are used to hldge whether s desigted LSI exhiuits intendeg performance and to identify portions where design modificauion is nceded. The timing
hes are used in a large variety and, a consequence, are winch constructions of control and drive Some of the sophisticated winch constructions are hydraulically operated include a hydraulic motor for driving a winch drum. Typically, there is provided hydraulically disengaged brake which brakes the drum to prevent unduly rapid lowering of load be by winch, and also multiple-speed, hydraulically controlled transmissions interconnect the drum and the drive motor therefor. In constructions, it is highly desirable to provide a for regulating the amount control fluid applied to the disengaged to control degree disengagement such brake and control the rate of descent of an elevated load. It is also desirable that means be provided a load the winch be even the prime mover hydraulic pump providing fluid under pressure system is inoperative. Moreover, it is desirable that such means to enable lowering of the load the prime mover is inoperative can be selectively to prevent inadvertent or intentional lowering of the load when the winch operator is away operating station. Finally, it desirable that manual for system made simple and foolproof as possible. 1. Field of the Invention The present invention to a delay characteristic analyzing method for analyzing the delay a LSI precisely in EDA (electronic design automation) custom that is used for on transistor a LSI exhibits necessary performance reliably, transistor-level design technology makes it to design a custom variety of transistors freely is required. To evaluate whether a full custom LSI that has designed elaborately on the transistor level exhibits necessary performance, a delay characteristic method for delay characteristic very accurately and a delay characteristic system using such a characteristic analyzing method are indispensable. 2. Description of the Art the paths an input node an output node an LSI, paths a signal the node delay time and a longest delay are critical paths, respectively. The critical and times are part of the important indices that are used to judge whether a designed intended performance and to portions design modification is needed. The timing
hes are used in a large variety Of operatioNs and, As a ConSeQuenCe, thEre are winch conSTrucTions available with wideLy varYiNG degREeS of soPhisticATeD COntRoL aNd dRiVE eQuipmEnt. some of tHe more sophIstIcAted winch conSTrUctions are HydRaulically opEraTed and InCluDE a hydRauLic moTor for DRiving A winch druM. TYPicallY, There is PROvIded A hydraulically disENgAGed brake which bRakes tHe DRuM TO prEveNt unduly raPiD loweRIng of a lOAd TO BE hoISted by the wincH, and also mulTIplE-speed, HyDraULicallY contRoLLed TransmissioNs inTerconnecT the drUM and the DRive motOr therEfoR.
In Such COnStRucTiONs, iT Is HigHLy dEsirable To PrOvide A meaNS FOR regUlaTing The amOunt of control FluId apPLieD to thE hydrAuliCaLly diSengagEd braKe To control the degRee oF disengagEmeNt Of sUcH brakE And theRebY coNtrol thE rate of DEscEnT OF An Elevated load. It is alSo DESiRable thaT means BE pRoVIded wherEbY a lOad hOISted bY the WInCh can be lOwered EVeN wHen the pRiMe moveR fOr tHe hYdrauLIc puMp provIding fluId undER pressure for thE Winch system is INoPERaTIve.
MOreOver, it is desIrabLE thaT any SUcH meANs empLoyed To ENaBLe lowering of the load WhEn the pRime mOver is inoperaTive can be sELECtively dIsabLEd TO prevent inadveRtent Or intentioNAl loweriNg of tHe load whEn the wincH OPerator iS awAy fRom The OPErAting station.
FINAlly, It Is desirAblE that maNuaL coNtrOls FoR the systeM be made aS sImPlE aNd aS foolPRoof as poSsIblE. 1. FIelD of thE inventIon
ThE preSeNt INveNtion reLAtES To a dElAy CharActErIstic AnalYZinG method For analyzIng THe deLaY cHaracteRistic of a custOm lSI preciseLy In tHe EDA (eLECtronic dEsign automation) for custoM lSIs thaT is Used fOr elAborate deSigNing on The TRansisTor levEl.
To dEsIgn A CUstom lsi tHat ExHibits neceSSAry PerfoRmAnce ReliablY, a transistor-level dESigN technology maKes It poSSIbLe tO DeSIgn A cUStoM lsI by combining a wIde variety Of TRaNsistors frEEly Is RequireD.
To evalUate cORrectly Whether a fUll custom lSi thaT HAs bEen designeD elaboraTely on the TRansiSToR leveL exHibits NeCesSary pErformANce, A delaY charaCtEristiC analYzIng methoD for analyzing its delay chAracteRistiC veRy accuratEly ANd a Delay charActeRistic analYziNg sYstem UsiNG such A delAY cHarACteriStic ANalyzing mEThOd aRE InDispensable.
2. dESCriPtion Of tHE RelatEd ArT
Among the paths conNEcting an input nOde aND An oUtpUT nodE oF an LSI, paths aloNg wHiCH A signal rEaChes the outpUt node wiTh A ShortEst delAy time And a lonGESt DElay tiMe arE caLled critiCal PaTHs, respeCtIvELy. The cRitiCaL paths And theIR delAY Times are part of thE impoRTAnt inDIceS that ArE used to JUdge Whether a deSigned LSI exHibits InteNded pErformaNcE and to IdeNtIfy portionS Where desiGn modIficatiOn Is neEdeD. The tiMing
hes are used in a large va riety of o perat ion s a nd , as  a c onsequence, th e re a re winch constructions  avai la b le w i th  wide ly vary i ng d egr ee sofso p hi stica ted  contro l and driv e e qu ipment. Some of  the moresop histicated w inc h cons tr uct i ons a rehydra ulical l y oper ated andin c lude a hydraul i c  m otor  for driving a wi n ch drum. Typicall y, the re is p rov ide d a hydrau li cally disenga g ed b r ake which brakesthe drum to pre vent u nd uly rapidlower in g  of  a load tobe h oisted by  the w i nch, an d  also m ultipl e-s pee d, h y dr au lic al l y c o nt rol l edtransmis si on s int erco n n e c t th e d rumand t he drive moto r t here f or. 
In s uch c onst ru ction s, itis hi gh ly desirable to  pro vide a me ans  f orre gulat i ng the  am oun t of co ntrol f l uid  a p p l ie d to the hydraulic al l y  d isengage d brak e  t oc ontrol t he  de gree o f dis enga g em ent of s uch br a ke  a nd ther eb y cont ro l t herateo f de scentof an el evate d  load. It is a l so desirablet ha t me a ns b e p rovided whe reby a lo ad h o is ted by th e win ch ca n  be lowered even wh en  the p rimemover for the  hydraulic p u mp provi ding fl u id under press ure f or the win c h system  is i noperati ve.
Moreo v e r, it is  de sir abl e t h a tany such mean s empl oy ed to e nab le lowe rin g o f t helo ad when t he prime  m ov er  i s i noper a tive can  b e s el ect ively disabl ed to  pre ve nt ina dverten t  o r inte nt io nallow er ing o f th e  lo ad when  the winc h o p erat or  i s awayfrom the oper at ing statio n. 
Fi nally, i t is des irable that manual cont r ols for  th e sys tembe made a s s impleand as foo lproof  as p os sib l e . 1.F i el d o fthe Invent i o n
T he pr es entinventi on relates to a de l aycharacteristi c a naly z i ng  me t ho d  fo ra nal y z ing the delay c haracteris ti c  o f a custom LSI  p recisel y in th e EDA (electr onic desi gn automa ti on)f o r c ustom LSIs  that is  used for elabo r at e des ign ing on  t hetrans istorl eve l.
To  desig na cust om LS Ithat exh ibits necessary perform ance r eliab ly,  a transi sto r -le vel desig n te chnology m ake s i t pos sib l e todesi g na c u stomLSIb y combini n ga w i d evariety oft r a nsi stors  fr e ely is  req uired.
To evaluat e  correctly whe ther a  fu llc usto mLSI that has b een  d e s igned el ab orately onthe tran si s tor l evel e xhibit s neces s a ry perfor manc e,a delay c har ac t eristic  a na l yzingmeth od  for a nalyzi n g it s delay characteri sticv e ry ac c ura telyan d a del a y ch aracterist ic analyzin g syst em u singsuch ade lay ch ara ct eristic an a lyzing me thodare ind is pens abl e.
2.Desc r i ption  ofth e R elated Ar t Am o ng  t h e p aths  conn ec ting  an input node and  an outputno deo f  an LS I ,p a ths alongwhi ch as i gnal reach e s th e  o u tputnode w ith ashortes t  de la y timeand a  longestdelay tim e  ar ecall ed criti ca l pa th s,re spectively. The  critica l pathsa n d thei r d e layt imes a re  part of the  impo rt a nt indi c e s t hat are use d t o j udge  wh ethe r  a designed LSI exhibits  int ended per forma nce a nd  to iden t ifyportions where designmodification is nee d ed.The ti mi ng
hes are_used in_a large variety of_operations and,_as_a consequence,_there_are winch constructions_available with widely_varying degrees of sophisticated_control and drive_equipment._Some of the more sophisticated winch constructions are hydraulically operated and include a hydraulic_motor_for driving_a_winch_drum. Typically, there is provided_a hydraulically disengaged brake which_brakes the_drum to prevent unduly rapid lowering of a_load_to be hoisted_by the winch, and also multiple-speed, hydraulically controlled transmissions_interconnect the drum and the drive_motor therefor.
In such_constructions,_it_is highly desirable to_provide a means for regulating the_amount of control fluid applied to_the hydraulically disengaged brake to control the_degree of disengagement of such brake_and thereby control the rate_of descent_of an elevated load. It_is also desirable_that means_be provided whereby_a load hoisted by the winch_can be lowered_even when the prime mover for_the_hydraulic pump providing_fluid_under_pressure for_the winch system_is_inoperative.
Moreover, it_is_desirable that any such means employed_to_enable lowering of the load when the_prime mover is inoperative_can_be selectively disabled to_prevent inadvertent or intentional lowering_of the load when the winch_operator is_away from_the operating station.
Finally, it is desirable that manual controls for the_system be made as simple and_as foolproof as possible._1. Field_of_the Invention
The present_invention_relates to_a delay characteristic analyzing method for analyzing_the delay_characteristic of a custom LSI precisely_in the EDA (electronic_design_automation) for custom LSIs that is_used for elaborate designing on the_transistor level.
To design a custom_LSI_that_exhibits necessary performance reliably, a_transistor-level design technology makes it possible_to design a_custom LSI by combining a wide variety_of_transistors freely is required.
To evaluate correctly_whether_a full custom LSI that has_been_designed_elaborately on the transistor level_exhibits necessary performance, a delay characteristic_analyzing method for analyzing its delay characteristic very accurately_and a delay_characteristic analyzing system using such_a_delay_characteristic analyzing method are indispensable.
2. Description of the Related Art
Among_the paths_connecting an input_node and an output node of an LSI, paths along_which a signal reaches the output node_with a shortest delay time and a longest delay time are_called critical paths, respectively. The critical paths and_their delay times are part of the_important indices that are_used_to judge whether a designed LSI exhibits_intended_performance_and_to identify portions_where design modification_is needed. The_timing