Masisitimu ekuchengetera zvinhu emazuva ano haangokure pamatanho epamusoro chete uye ane mwero wekutamisa data wakakwira, asiwo anoda simba shoma uye anogara munzvimbo diki. Masisitimu aya anodawo kubatana kuri nani kuti ape kuchinjika kwakanyanya. Vagadziri vanoda ma "connection" madiki kuti vape mwero wedata unodiwa nhasi kana mune ramangwana. Uye tsika kubva pakuzvarwa kusvika pakukura uye kukura zvishoma nezvishoma haisi basa rezuva nezuva. Kunyanya muindasitiri yeIT, chero tekinoroji iri kuramba ichivandudzika uye ichichinja-chinja, sezvakaita Serial Attached SCSI (SAS) specification. Semutsivi weSCSI yakafanana, SAS specification yave iripo kwenguva yakati.
Mumakore apfuura SAS, magadzirirwo ayo akavandudzwa, kunyangwe protocol iri pasi yakaramba iripo, hapana shanduko dzakawanda, asi magadzirirwo einternet connector ekunze akachinja zvakawanda, inova shanduko yakaitwa neSAS kuti ienderane nemamiriro emusika, nekuvandudzwa kuri kuitwa "matanho ekuwedzera kusvika kumakiromita chiuru" aya, magadzirirwo eSAS akakura zvakanyanya. Ma interface connectors emhando dzakasiyana anonzi SAS, uye shanduko kubva pa parallel kuenda ku serial, kubva pa parallel SCSI technology kuenda ku serial connected SCSI (SAS) technology yakachinja zvakanyanya nzira yekufambisa tambo. SCSI yekare yaimbove ne single-end kana differential pamusoro pe16 channels kusvika ku320Mb/s. Parizvino, SAS3.0 interface iyo inowanzo kuwanikwa mumunda wekuchengetedza enterprise ichiri kushandiswa pamusika, asi bandwidth inokurumidza kaviri kupfuura SAS3 iyo isina kuvandudzwa kwenguva yakareba, inova 24Gbps, inenge 75% ye bandwidth ye common PCIe3.0×4 solid-state drive. Chinobatanidza cheMiniSAS chazvino chatsanangurwa muSAS-4 chidimbu chidiki uye chinobvumira density yakanyanya. Chinobatanidza cheMini-SAS chazvino chakaenzana nehafu yekubatanidza kweSCSI yekutanga uye 70% saizi yekubatanidza kweSAS. Kusiyana netambo yeSCSI yekutanga yakafanana, SAS neMini SAS dzine nzira ina. Zvisinei, pamusoro pekumhanya kwakanyanya, density yakanyanya, uye kuchinjika kwakanyanya, kunewo kuwedzera kwekuomarara. Nekuda kwehukuru hudiki hwechinobatanidza, mugadziri wetambo yekutanga, muunganidzi wetambo, uye mugadziri wesystem vanofanirwa kunyatsoteerera ma signal integrity parameters mukati mekubatanidza kwetambo.
Havasi vese vanounganidza tambo vanokwanisa kupa masaini ekumhanya kwepamusoro-soro kuti vasangane nezvinodiwa zvekuchengetedza masaini emagetsi. Vanounganidza tambo vanoda mhinduro dzemhando yepamusoro uye dzinodhura zvishoma dzemasisitimu ekuchengetedza matsva. Kuti vagadzire masaini ekumhanya-mhanya akasimba uye akasimba, zvinhu zvakawanda zvinofanira kufungwa nezvazvo. Kuwedzera pakuchengetedza mhando yemuchina wekugadzira nekugadzira, vagadziri vanofanirwa kunyatsoteerera maparamita ekuchengetedza masaini anoita kuti tambo dzememory device dzemazuva ano dzikwanise kukwanisika.
Tsanangudzo yekuvimbika kwechiratidzo (Chiratidzo chipi chakakwana?)
Zvimwe zvezvinhu zvikuru zvekusimbisa masaini zvinosanganisira kukanganiswa kwekuisa, kutaura kwepedyo neparutivi neparutivi, kurasikirwa kwekudzoka, kukanganiswa kwepakati pemusiyano mukati, uye amplitude yemusiyano kune common mode. Kunyangwe zvinhu izvi zvakabatana uye zvichipesvedzerana, tinogona kufunga nezvechinhu chimwe nechimwe kuti tidzidze kukanganisa kwayo kukuru.
Kurasikirwa kwekuisa (Ma parameter e frequency yepamusoro 01- ma parameter ekuderedza simba)
Kurasikirwa kwekuisa chiratidzo kurasikirwa kwehukuru hwechiratidzo kubva kumagumo ekutumira kwetambo kuenda kumagumo anogamuchira, izvo zvinoenderana zvakananga nefrequency. Kurasikirwa kwekuisa chiratidzo kunoenderanawo nenhamba yewaya, sezvakaratidzwa mudhayagiramu yekudzikamisa chiratidzo pazasi. Kune zvikamu zvemukati zvetambo ye30 kana 28-AWG, tambo yemhando yepamusoro inofanira kunge iine attenuation iri pasi pe2dB/m pa1.5GHz. Kune 6Gb/s SAS yekunze uchishandisa tambo dze10m, tambo ine avhareji yemutsara we24 inokurudzirwa, iyo ine attenuation ye13dB chete pa3GHz. Kana uchida margin yakawanda yechiratidzo pamitengo yakakwira yedata, taura tambo ine attenuation shoma pafrequency yakakwira yetambo refu.
Crosstalk (High Frequency Parameters Basics 03- Crosstalk parameters)
Huwandu hwesimba rinotumirwa kubva kune imwe signal kana difference pair kuenda kune imwe. Kune tambo dzeSAS, kana near-end crosstalk (NEXT) isiri diki zvakakwana, zvinokonzeresa matambudziko mazhinji ekubatanidza. Kuyerwa kweNEXT kunoitwa pamucheto mumwe chete wetambo, uye huwandu hwesimba rinotamiswa kubva pa output transmission signal pair kuenda ku input receiving pair. Far-end crosstalk (FEXT) inoyerwa nekuisa chiratidzo che transmission pair kune rumwe rutivi rwetambo uye kutarisa kuti simba rakawanda sei rinosara pachiratidzo che transmission kune rumwe rutivi rwetambo.
CHINOTEVERA mukubatanidza tambo nekubatanidza tambo chinowanzo kukonzerwa nekusabatanidzwa zvakanaka kwezviratidzo zvemagetsi, izvo zvinogona kukonzerwa nekubuda kwemagetsi nemapulagi, kusakwana kwepasi, kana kusabatwa zvakanaka kwenzvimbo yekugumisa tambo. Mugadziri wesystem anofanira kuona kuti muunganidzi wetambo agadzirisa nyaya idzi nhatu.
Makomba ekurasikirwa kwetambo dzakajairika dze100Ω dze24, 26, uye 28
Kubatanidzwa kwetambo dzemhando yepamusoro zvichienderana ne "SFF-8410-Specification for HSS Copper Testing and Performance Requirements" zvakayerwa kuti NEXT inofanira kunge iri pasi pe3%. Kana tichitaura nezve s-parameter, NEXT inofanira kunge yakakura kupfuura 28dB.
Kurasikirwa Nekudzoka (High Frequency Parameters Basics 06- Kurasikirwa Nekudzoka)
Kurasikirwa kwekudzoka kunoyera huwandu hwesimba rinobuda kubva musystem kana tambo kana chiratidzo chaiswa. Simba iri rinobuda rinogona kukonzera kudzikira kwehukuru hwesignal pamucheto wekugamuchira tambo uye rinogona kukonzera matambudziko ekuvimbika kwesignal pamugumo wekutumira, izvo zvinogona kukonzera matambudziko ekupindirana kwemagetsi kune vagadziri vesystem nevagadziri vesystem.
Kurasikirwa uku kwekudzoka kunokonzerwa nekusawirirana kweimpedance mukubatana kwetambo. Kungogadzirisa dambudziko iri nekungwarira kukuru chete ndiko kunogona kuita kuti impedance yechiratidzo isachinje painopfuura nepasocket, plug uye wire terminal, kuitira kuti shanduko yeimpedance ideredzwe. SAS-4 standard yazvino inovandudzwa kusvika paimpedance value ye±3Ω zvichienzaniswa ne±10Ω yeSAS-2, uye zvinodiwa zvetambo dzemhando yepamusoro zvinofanirwa kuchengetwa mukati me85 kana 100±3Ω.
Kukanganisa kwakakombama
Mumatambo eSAS, pane kukanganiswa kuviri kwe skew: pakati pe difference pairs uye mukati me difference pairs (chiratidzo chekusiyana kwechiratidzo chekuvimbika). Mudzidziso, kana masaini akawanda akaiswa kune rimwe divi retambo, anofanira kusvika kune rimwe divi panguva imwe chete. Kana masaini aya asingasvike panguva imwe chete, chiitiko ichi chinonzi skew distortion of the cable, kana delay-skew distortion. Kune ma difference pairs, skew distortion mukati me difference pairs kunonoka pakati pewaya mbiri dze difference pairs, uye skew distortion pakati pe difference pairs kunonoka pakati pemaseti maviri e difference pairs. Kukanganiswa kukuru kwe difference pairs kuchawedzera difference balance ye transmission signal, kuderedza amplitude yesignal, kuwedzera time jitter uye kukonzera matambudziko e electromagnetic interference. Musiyano we cable yemhando yakanaka ne internal skew distortion inofanira kunge iri pasi pe10ps.
Nguva yekutumira: Mbudzi-30-2023
