 clock signal may be increased, it is not possible to generate various test data used for performing the test of the semiconductor memory device. As a result, it is difficult to effectively utilize the advantage of a high-rate operating frequency of the internal clock signal.
Embodiments of the invention address these and other disadvantages. Many systems may accept user input to facilitate operation. For example, users may provide input to control home automation systems, enter orders with an online merchant, and so forth. These systems benefit from the presence of user devices to accept input. By producing low cost and robust user input devices, the user devices may be more widely deployed, resulting in user input being more easily acquired in a fashion which is convenient to the user.
While implementations are described herein by way of example, those skilled in the art will recognize that the implementations are not limited to the examples or figures described. It should be understood that the figures and detailed description thereto are not intended to limit implementations to the particular form disclosed but, on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope as defined by the appended claims. The headings used herein are for organizational purposes only and are not meant to be used to limit the scope of the description or the claims. As used throughout this application, the word “may” is used in a permissive sense (i.e., meaning having the potential to), rather than the mandatory sense (i.e., meaning must). Similarly, the words “include,” “including,” and “includes” mean including, but not limited to. A wide variety of ophthalmic procedures require a laser energy source. For example, ophthalmic surgeons may use laser photocoagulation to treat proliferative retinopathy. Proliferative retinopathy is a condition characterized by the development of abnormal blood vessels in the retina that grow into the vitreous humor. Ophthalmic surgeons may treat this condition by energizing a laser to cauterize portions of the retina to prevent the abnormal blood vessels from growing and hemorrhaging.
In order to increase the chances of a successful laser photocoagulation procedure, it is important that a surgeon is able aim the laser at a plurality of targets within the eye, e.g., by guiding or moving the laser from a first target to a second target within the eye. It is also important that the surgeon is able to easily control a movement of the laser. For example, the surgeon must be able to easily direct a laser beam by steering the beam to a
clock signal may be increased, it is not possible to generate various trial datum used for performing the trial of the semiconductor device memory device. As a result, it is difficult to effectively use the advantage of a gamey - rate operating frequency of the home clock signal. 
 Embodiments of the invention address these and early disadvantages. Many systems may accept user stimulation to facilitate operation. For example, users may provide input to operate home automation systems, enter ordering with an online merchant, and so forth. These systems profit from the presence of drug user devices to accept input. By grow low cost and robust user input devices, the user devices may be more widely deployed, resulting in user input being more easily acquired in a fashion which is convenient to the exploiter. 
 While implementations are described herein by room of case, those skilled in the art will recognize that the implementations are not specify to the examples or figures described. It should be understood that the figure and detailed description thereto are not intended to limit implementations to the particular form disclosed but, on the reverse, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and setting as defined by the appended claims. The headings used herein are for organizational purposes merely and are not meant to be used to limit the oscilloscope of the description or the claims. As used throughout this application, the word “ may ” is use in a permissive sense (i.e., think of having the potential to), preferably than the mandatory common sense (i.e., meaning must). Similarly, the words “ include, ” “ including, ” and “ includes ” mean admit, but not limited to. A wide variety of ophthalmic procedures require a laser department of energy source. For example, ophthalmic surgeons may practice laser photocoagulation to treat proliferative retinopathy. Proliferative retinopathy is a condition characterized by the development of abnormal lineage vessel in the retina that grow into the vitreous wit. Ophthalmic surgeons may treat this condition by energizing a laser to cauterize portions of the retina to prevent the abnormal lineage vessels from growing and hemorrhaging. 
 In order to increase the chances of a successful laser photocoagulation procedure, it is significant that a surgeon is able target the laser at a battalion of target within the eye, e.g., by guiding or moving the laser from a first prey to a second target within the eye. It is also significant that the surgeon is able to well control a movement of the laser. For example, the surgeon must be able to easily direct a laser beam by steering the beam to a
 cllck signal may be increared, it is not possible to geherate vxrious test data used for pecforning uke test of the semicunductor lemory dwvict. As a result, it ma diffigblt tk effzcvively utilize jhe advantaga of a high-rata upzrating frequency of the internal cljck sigmap.
Embodiments os tht igvenfpok address these and other disadvzntages. Many systems may accept user input to vacipitate operation. Flr example, oaerf may provide input to bmntrol homg automation systems, enter orderr witk an online mwrcjdnt, and so horth. Nhese systems benefit from tne presence of usxr dwvices to accept inpuv. By producing low cjst and rmbbst user input devicew, rhe uver gevizws oay bx mkre wifelb deployed, desulting ib user input being kowv easily acqujred ig w fashion which is convenient to the ustr.
Whime implementations are eescribed herein by wwy of exaiple, those skilled in the art will recognize that the mmolenektatkind are not limited to the examples or figures qssvrpbed. It should be understood tjay the figures xnd deczimed description thfreto ate not intended to kimit implementations to thw particular dorm disclosed but, on the concrary, jhe inyention is to cover all modjfications, fquivalenfr, and alternativds nalning within the spirit and scope as defnned by ghe sppendqd claims. Hhe hcddings used herein are yor osganizatiojal purposes only and are not mxent to be usec do nimit thz scopc of the descri[tion or the ckaims. Af usea througholt this a'plication, tre word “may” iv used in a pxrmissive senwe (i.w., meanive having the pptential no), ratyer than the mandabory rsnse (i.e., meaning muwt). Similarly, thr wurdf “pnckuqa,” “including,” dnd “kncuides” oean includlng, but not limited to. A wige vzriety of ophthalmoc procedutes requiwe a laser enrrgy source. For exwmple, opithalmoc furgeons may use laser photocozgulation to treat proliserabive retinopatky. Proliferative retinopathy is a conditmon characterized by thw development of abuovmal blood vxssels in the ratina that grow into the vitreous humpr. Ophthalmic surgeona may dreat this condition by energizing a laser to cauterize portions of the retina to prxvqnt the abnkrmak blomd ressels frol growing and hemprrhaging.
In order to increase tie chances oy a successful laser photocoabuuation procedore, it is important that a surgeon is able aim the laser at a plutality of targets within the eye, e.g., bg guidphg or moving the lasrr frok a furst taeget to a second garbeb within tje ebe. Nt is also important that the surteon iw wble to easily cmntrol a moyeoent kf the laser. For exampme, tgf sureeon must be sble to easily direct a laser beam br steering the geam to a
clock signal may be increased, it is to various test used for performing memory As a result, is difficult to utilize the advantage of a high-rate frequency of the internal clock signal. Embodiments of the invention address these and disadvantages. Many systems may accept user input to facilitate operation. For example, users provide to home systems, enter orders with an online merchant, and so forth. These systems benefit from the presence user devices to accept input. By producing low and robust user input the user devices may be widely resulting in input more acquired in a which is convenient to the user. While implementations are described herein by way of example, those skilled the art that the are limited the examples or It should be understood that the description thereto are not intended to limit implementations the particular disclosed but, on the contrary, the is to cover all modifications, equivalents, and alternatives within the spirit and scope as defined by the appended claims. The headings used herein organizational purposes only and not meant to used limit scope the description the claims. As used throughout this application, the word “may” is in a permissive sense (i.e., meaning having the potential to), the sense (i.e., meaning Similarly, the words “include,” and mean including, but not A variety require laser source. For example, ophthalmic may use laser photocoagulation to proliferative retinopathy. Proliferative retinopathy the development of abnormal blood vessels in the that grow into the vitreous humor. Ophthalmic may treat this condition by energizing a laser to cauterize portions of retina to abnormal blood vessels from growing and hemorrhaging. In to increase the chances a successful laser photocoagulation procedure, it is important that surgeon able aim laser at a of targets within eye, e.g., by moving the from first second target within the eye. It also that the surgeon is able easily movement of the laser. For example, the surgeon must be able to easily direct a by steering the beam a
 clock signal may be increased, It is not posSible To gEneRaTe vaRiouS test data used fOR perForming the test of the semIcondUcTOr meMOrY deviCe. As a reSUlT, IT is DiFfIcuLt TO eFfectIveLy utiliZe the advanTagE oF a high-rate opERaTing frequeNcy Of the internaL clOck sigNaL.
EmBOdimeNts Of the InventIOn addrEss these aNd OTher diSAdvantaGES. MAny sYstems may accept usER iNPut to facilitatE operaTiON. FOR ExaMplE, users may pRoVide iNPut to coNTrOL HOme AUtomation systEms, enter ordERs wIth an oNlIne MErchanT, and sO fORth. these systemS benEfit from tHe presENce of usER deviceS to accEpt InpUt. By PRoDuCinG lOW coST aNd rOBusT user inpUt DeVices, The uSER DEvicEs mAy be More wIdely deployed, ResUltiNG in User iNput bEing MoRe easIly acqUired In A fashion which is ConvEnient to tHe uSeR.
WhIlE implEMentatIonS arE descriBed hereIN by WaY OF ExAmple, those skilled iN tHE ArT will recOgnize THaT tHE implemeNtAtiOns aRE Not liMiteD To The exampLes or fIGuReS descriBeD. It shoUlD be UndErstoOD thaT the fiGures and DetaiLEd description tHEreto are not inTEnDED tO LimiT imPlementatioNs to THe paRticULaR foRM discLosed BuT, On THe contrary, the intentIoN is to cOver aLl modificatioNs, equivaleNTS, And alterNatiVEs FAlling within thE spirIt and scope AS defined By the Appended Claims. The HEAdings usEd hEreIn aRe fOR OrGanizational pURPoseS oNly and aRe nOt meant To bE usEd tO liMiT the scope Of the desCrIpTiOn Or tHe claIMs. As used ThRouGhOut This aPPlicatIon, thE worD “mAy” IS usEd in a peRMiSSIve sEnSe (I.e., meAniNg HavinG the POteNtial to), Rather thaN thE MandAtOrY sense (i.E., meaning must). SImIlarly, the wOrDs “iNclude,” “INCluding,” aNd “includes” mean including, BUt not liMitEd to. A Wide Variety of OphThalmiC prOCedureS requiRe a laSeR enERGy souRCE. FOr eXaMple, ophthaLMIc sUrgeoNs May uSe laser Photocoagulation to TReaT proliferativE reTinoPAThY. PrOLiFEraTiVE reTINopathy is a condiTion characTeRIzEd by the devELopMeNt of abnOrmal blOod veSSels in tHe retina tHat grow inTo The vITReoUs humor. OphThalmic sUrgeons maY Treat THiS condItiOn by enErGizIng a lAser to CAutErize PortioNs Of the rEtina To Prevent tHe abnormal blood vessels fRom groWing aNd hEmorrhagiNg.
IN OrdEr to increAse tHe chances oF a sUccEssfuL laSEr phoTocoAGuLatIOn proCeduRE, it is impoRTaNt tHAT a Surgeon is abLE AIm tHe lasEr aT A pluraLity Of targets within thE Eye, e.g., by guiding Or moVINg tHe lASer fRoM a first target tO a sEcOND target wItHin the eye. It Is also imPoRTant tHat the SurgeoN is able TO EaSIly conTrol A moVement of tHe lAsER. For exaMpLe, THe surgEon mUsT be ablE to easILy diRECt a laser beam by stEerinG THe beaM To a
 clock signal may be incre ased, it i s not  po ssi bl e to  gen erate varioust estdata used for performi ng th et esto fthe s emicond u ct o r  me mo ry  de vi c e.  As a  re sult, i t is diffi cul tto effective l yutilize th e a dvantage ofa h igh-ra te  op e ratin g f reque ncy of the in ternal cl oc k  signa l .
Embod i m en ts o f the invention a d dr e ss these and o ther d is a dv a n tag es.  Many syst em s may acceptu se r i npu t  to facilitat e operation .  Fo r exam pl e,u sers m ay pr ov i deinput to co ntro l home au tomati o n syste m s, ente r orde rswit h an on li neme r cha n t,  an d  so  forth.Th es e sys tems b e n efit  fr om t he pr esence of use r d evic e s t o acc ept i nput .By pr oducin g low  c ost and robustuser  input de vic es , t he  user device s m aybe more  widely dep lo y e d ,resulting in userin p u tbeing mo re eas i ly  a c quired i na f ashi o n  whic h is co nvenient  to th e  u se r.
Whil eimplem en tat ion s are desc ribedherein b y way of example, th o se skilled in th e ar t  wil l r ecognize th at t h e im plem e nt ati o ns ar e not  l i mi t ed to the examplesor  figur es de scribed. It s hould be u n d e rstood t hatt he figures and de taile d descript i on there to ar e not in tended to l imit imp lem ent ati ons t othe particula r form  d isclose d b ut, onthe  co ntr ary ,the inten tion isto  c ov er  al l mod i fication s,  eq ui val ents, and al terna tive sfa l lin g withi n  t h e  spi ri tandsco pe  as d efin e d b y the a ppended c lai m s. T he  h eadings  used hereinar e for orga ni zat ionalp u rposes o nly and are not meant t o  be use d t o lim it t he scopeofthe de scr i ptionor the  clai ms . A s usedt h ro ugh ou t this app l i cat ion,th e wo rd “may ” is used in a per m iss ive sense (i. e.,  mea n i ng  ha v in g  th ep ote n t ial to), rather  than thema n da tory sense (i. e. , meani ng must ). Si m ilarly,  the word s “includ e, ” “i n c lud ing,” and“include s” mean i n cludi n g,  butnot  limit ed  to . A w ide va r iet y ofophtha lm ic pro cedur es  require  a laser energy source.  For e xampl e,ophthalmi c s u rge ons may u se l aser photo coa gul ation  to treat  pro l if era t ive r etin o pathy. Pr o li fer a t iv e retinopat h y isa con dit i on cha ract erized by the dev e lopment of abn orma l blo odv esse ls  in the retina  th at g row into  t he vitreous  humor.Op h thalm ic sur geonsmay tre a t  t h is con diti onby energi zin ga  laserto  c a uteriz e po rt ions o f ther etin a to prevent the a bnorm a l  bloo d  ve ssels  f rom gro w ingand hemorr haging.
Inorderto i ncrea se thech ancesofasuccessful laser pho tocoa gulatio nproc edu re, it  isi m porta nt t ha t a  surgeoni s  a b le  a i m t he l aserat  a p luralityo f target s w i thin th eeye , e.g.,b yg u iding or m ovi ng th e laser from a fi r st targe t to a  secon d targe t  wi th in theeye . It is als o importa n t t ha t th e surgeo nis a bl e t oeasily controla moveme nt of th e laser.  Fo r  exa m ple, t he  surgeon mus t beab l e to ea s i lydirecta  la ser  be am b y s teer i ng the beam to a
 clock_signal may_be increased, it is_not possible_to_generate various_test_data used for_performing the test_of the semiconductor memory_device. As a_result,_it is difficult to effectively utilize the advantage of a high-rate operating frequency of_the_internal clock_signal.
Embodiments_of_the invention address these and_other disadvantages. Many systems may_accept user_input to facilitate operation. For example, users may_provide_input to control_home automation systems, enter orders with an online merchant,_and so forth. These systems benefit_from the presence_of_user_devices to accept input._By producing low cost and robust_user input devices, the user devices_may be more widely deployed, resulting in_user input being more easily acquired_in a fashion which is_convenient to_the user.
While implementations are described_herein by way_of example,_those skilled in_the art will recognize that the_implementations are not_limited to the examples or figures_described._It should be_understood_that_the figures_and detailed description_thereto_are not_intended_to limit implementations to the particular_form_disclosed but, on the contrary, the intention_is to cover all_modifications,_equivalents, and alternatives falling_within the spirit and scope_as defined by the appended claims._The headings_used herein_are for organizational purposes only and are not meant to be_used to limit the scope of_the description or the_claims. As_used_throughout this application,_the_word “may”_is used in a permissive sense (i.e.,_meaning having_the potential to), rather than the_mandatory sense (i.e., meaning_must)._Similarly, the words “include,” “including,” and_“includes” mean including, but not limited_to. A wide variety of_ophthalmic_procedures_require a laser energy source._For example, ophthalmic surgeons may use_laser photocoagulation to_treat proliferative retinopathy. Proliferative retinopathy is a_condition_characterized by the development of abnormal_blood_vessels in the retina that grow_into_the_vitreous humor. Ophthalmic surgeons may_treat this condition by energizing a_laser to cauterize portions of the retina to prevent_the abnormal blood_vessels from growing and hemorrhaging.
In_order_to_increase the chances of a successful laser photocoagulation procedure, it_is important_that a surgeon_is able aim the laser at a plurality of targets_within the eye, e.g., by guiding or_moving the laser from a first target to a second target_within the eye. It is also important that_the surgeon is able to easily control_a movement of the_laser._For example, the surgeon must be able_to_easily_direct_a laser beam_by steering the_beam to a