I-MICROCHIP Ukutholwa Kwephutha Nokulungiswa Kunkumbulo ye-RTG4 LSRAM

Umlando Wokubuyekeza

Umlando wokubuyekeza uchaza izinguquko ezisetshenziswe kudokhumenti. Izinguquko zifakwe ohlwini ngokubukeza, kuqala ngokushicilelwa kwamanje.

Ukubuyekeza 4.0
Okulandelayo isifinyezo sezinguquko ezenziwe kulesi sibuyekezo.

• Buyekeza idokhumenti ye-Libero SoC v2021.2.
• Kwengezwe Isithasiselo 1: Ukuhlela Idivayisi Ngokusebenzisa iFlashPro Express, ikhasi 14.
• Kwengezwe Isithasiselo 2: Ukusebenzisa i-TCL Script, ikhasi 16.
• Kususwe izinkomba zezinombolo zenguqulo ye-Libero.

Ukubuyekeza 3.0
Kubuyekezwe idokhumenti yokukhishwa kwesofthiwe ye-Libero v11.9 SP1.

Ukubuyekeza 2.0
Kubuyekezwe idokhumenti yokukhishwa kwesofthiwe ye-Libero v11.8 SP2.

Ukubuyekeza 1.0
Ukushicilelwa kokuqala kwalo mbhalo.

Ukutholwa Kwephutha Nokulungiswa Kumemori ye-RTG4 LSRAM

Lo mklamo oyisithenjwa uchaza amakhono okutholwa kwephutha nokulungiswa (EDAC) we-RTG4™ FPGA LSRAMs. Esimweni esithintekayo somcimbi owodwa (SEU), i-RAM ijwayele ukuba namaphutha esikhashana adalwa ama-ion asindayo. Lawa maphutha angatholwa futhi alungiswe ngokusebenzisa amakhodi okulungisa amaphutha (ECCs). Amabhulokhi e-RTG4 FPGA RAM anezilawuli ezakhelwe ngaphakathi ze-EDAC ukukhiqiza amakhodi okulungisa amaphutha okulungisa iphutha le-1-bit noma ukuthola iphutha le-2-bit.

Uma kutholwa iphutha le-1-bit, isilawuli se-EDAC silungisa ibhithi yephutha futhi sisethe ifulegi lokulungisa iphutha (SB_CORRECT) libe phezulu okusebenzayo. Uma kutholwa iphutha le-2-bit, isilawuli se-EDAC sisetha ifulegi lokuthola iphutha (DB_DETECT) libe phezulu okusebenzayo.
Ukuze uthole ulwazi olwengeziwe mayelana nokusebenza kwe-RTG4 LSRAM EDAC, bheka ku-UG0574: RTG4 FPGA Fabric

Umhlahlandlela Womsebenzisi.
Kulo mklamo wereferensi, iphutha le-1-bit noma iphutha le-2-bit yethulwa nge-SmartDebug GUI. I-EDAC ibonwa kusetshenziswa i-graphical user interface (GUI), kusetshenziswa isixhumi esibonakalayo se-UART ukufinyelela i-LSRAM ukuze idatha ifundwe/ibhalwe, i-Libero® System-on-Chip (SoC) SmartDebug (JTAG) isetshenziselwa ukujova amaphutha kumemori ye-LSRAM.

Izidingo Zomklamo
Ithebula 1 libala izidingo zedizayini yesithenjwa zokuqalisa idemo ye-RTG4 LSRAM EDAC.

Ithebula 1 • Izidingo Zomklamo

Isofthiwe

• I-Libero SoC
• I-FlashPro Express
• I-SmartDebug
• Sekela abashayeli be-PC I-USB kuya kubashayeli be-UART

Qaphela: I-Libero SmartDesign kanye nezithombe zesikrini zokumisa eziboniswe kulo mhlahlandlela ezenhloso yemifanekiso kuphela.
Vula idizayini ye-Libero ukuze ubone izibuyekezo zakamuva.

Okudingekayo
Ngaphambi kokuthi uqale:
Landa futhi ufake i-Libero SoC (njengoba kukhonjisiwe ku- webindawo yalo mklamo) ku-PC engumsingathi ukusuka endaweni elandelayo: https://www.microsemi.com/product-directory/design-resources/1750-libero-soc

Idemo Design
Landa idizayini yedemo files kusukela ku-Microsemi webisayithi ku: http://soc.microsemi.com/download/rsc/?f=rtg4_dg0703_df

Idizayini yedemo files zihlanganisa:

• Iphrojekthi ye-Libero SoC
• Isifaki se-GUI
• Ukuhlela files
• Fundame.txt file
• TCL_Scripts

Uhlelo lokusebenza lwe-GUI ku-PC yokusingatha lukhipha imiyalo kudivayisi ye-RTG4 ngesixhumi esibonakalayo se-USB-UART. Lesi sixhumanisi se-UART siklanywe nge-CoreUART, okuyi-IP enengqondo evela kukhathalogi ye-Libero SoC IP. I-CoreUART IP engutsheni ye-RTG4 ithola imiyalo futhi iyidlulisele ku-logic yedecoder yomyalo. I-logic yedecoder ye-command inquma umyalo wokufunda noma wokubhala, owenziwa kusetshenziswa i-logic interface yememori.

I-memory interface block isetshenziselwa ukufunda/ukubhala nokuqapha amafulegi amaphutha e-LSRAM. I-EDAC eyakhelwe ngaphakathi ilungisa iphutha le-1-bit ngenkathi ufunda ku-LSRAM futhi inikeza idatha elungisiwe kusixhumi esibonakalayo somsebenzisi kodwa ayibhali idatha elungisiwe ibuyisele ku-LSRAM. I-LSRAM EDAC eyakhelwe ngaphakathi ayisebenzisi isici sokukhuhla. Idizayini yedemo isebenzisa ingqondo yokukhuhla, eqapha ifulegi lokulungisa le-1-bit futhi ibuyekeze i-LSRAM ngedatha elungisiwe uma kwenzeka iphutha elilodwa elincane.
I-SmartDebug GUI isetshenziselwa ukujova iphutha le-1-bit noma le-2-bit kudatha ye-LSRAM.
Umfanekiso 1 ubonisa umdwebo webhulokhi wezinga eliphezulu wedizayini yedemo ye-RTG4 LSRAM EDAC.

Umfanekiso 1 • Umdwebo Webhulokhi Wezinga eliphezulu

Okulandelayo ukulungiselelwa kwedizayini yedemo:

1. I-LSRAM ilungiselelwe imodi ye-×18 futhi i-EDAC inikwe amandla ngokuxhuma isignali ye-LSRAMs ECC_EN ukuya phezulu.
   Qaphela: I-LSRAM EDAC isekelwe kumamodi angu-×18 kanye ne-×36 kuphela.
2. I-CoreUART IP ilungiselelwe ukuthi ixhumane nohlelo lokusebenza lwe-PC lomsingathi ngenani le-baud elingu-115200.
3. I-RTG4FCCCECALIB_C0 ilungiselelwe ukuthi iwashise i-CoreUART nokunye okunengqondo kwendwangu kokuthi 80 MHz.

Izici
Okulandelayo yizici zedizayini yedemo:

• Funda futhi ubhalele i-LSRAM
• Faka iphutha le-1-bit kanye ne-2-bit usebenzisa i-SmartDebug
• Bonisa amanani wephutha angu-1-bhithi no-2-bit
• Ilungiselelo lokusula amanani esibalo samaphutha
• Nika amandla noma vala i-logic yokukhuhla inkumbulo

Incazelo
Lo mklamo wedemo ubandakanya ukuqaliswa kwale misebenzi elandelayo:

• Ukuqala nokufinyelela i-LSRAM
  Ingqondo yokusebenzelana kwenkumbulo esetshenziswe kungqondongqondo yendwangu ithola umyalo wokuqalisa ovela ku-GUI futhi iqalise izindawo zokuqala zenkumbulo ezingu-256 ze-LSRAM ngedatha ekhulayo. Iphinde yenze imisebenzi yokufunda nokubhala ezindaweni zenkumbulo ezingama-256 ze-LSRAM ngokuthola ikheli nedatha evela ku-GUI. Ngomsebenzi wokufunda, idizayini ilanda idatha ku-LSRAM futhi iyinikeze ku-GUI ukuze iboniswe. Okulindelekile ukuthi umklamo ngeke udale amaphutha ngaphambi kokusebenzisa i-SmartDebug.

Qaphela: Izindawo zememori ezingakaqalwa zingase zibe namanani angahleliwe, futhi i-SmartDebug ingase ibonise amaphutha ebhithi eyodwa noma kabili kulezo zindawo.

• Ijova amaphutha angu-1-bit noma angu-2-bit
  I-SmartDebug GUI isetshenziselwa ukujova amaphutha ebhithi elingu-1 noma angu-2 endaweni eshiwo yememori ye-LSRAM. Imisebenzi elandelayo yenziwa kusetshenziswa i-SmartDebug ukujova amaphutha angu-1-bit no-2-bit ku-LSRAM:
  • Vula i-SmartDebug GUI, chofoza i-Debug FPGA Array.
  • Iya kuthebhu ye-Memory Blocks, khetha isibonelo sememori, bese uchofoza kwesokudla u-Engeza.
  • Ukuze ufunde i-memory block, chofoza okuthi Funda Block.
  • Faka iphutha lebhithi eyodwa noma eliphindwe kabili kunoma iyiphi indawo ye-LSRAM yokujula okuthile.
  • Ukuze ubhalele indawo elungisiwe, chofoza okuthi Bhala Vimba.
    Ngesikhathi se-LSRAM ukufunda nokubhala ukusebenza nge-SmartDebug (JTAG) isixhumi esibonakalayo, isilawuli se-EDAC siyeqiwe futhi asibali izingcezu ze-ECC zomsebenzi wokubhala esinyathelweni e.
• Iphutha Ukubala
  Izibali ze-8-bit zisetshenziselwa ukunikeza isibalo samaphutha futhi ziklanywa kungqondongqondo yendwangu ukubala amaphutha angu-1-bit noma angu-2-bit. I-logic yedecoder yomyalo inikeza amanani okubala ku-GUI lapho ithola imiyalo evela ku-GUI.

Isakhiwo Sewashi
Kulo mklamo wedemo, kunesizinda sewashi esisodwa. I-oscillator yangaphakathi engu-50 MHz ishayela i-RTG4FCCC, eqhubeka nokushayela i-RTG4FCCCECALIB_C0. I-RTG4FCCCECALIB_C0 ikhiqiza iwashi elingu-80 MHz elihlinzeka ngomthombo wewashi kumamojula we-COREUART, cmd_decoder, TPSRAM_ECC, kanye ne-RAM_RW.
Umfanekiso olandelayo ubonisa isakhiwo sewashi somklamo wedemo.

Umfanekiso 2 • Isakhiwo sewashi

Setha kabusha Isakhiwo
Kulo mklamo wedemo, isignali yokusetha kabusha ku-COREUART, cmd_decoder, namamojula we-RAM_RW anikezwa ngembobo ye-LOCK ye-RTG4FCCCECALIB_C0. Umfanekiso olandelayo ubonisa ukwakheka kokusetha kabusha kwedizayini yedemo.

Umfanekiso 3 • Hlela kabusha Isakhiwo

Isetha Idizayini Yedemo
Izigaba ezilandelayo zichaza indlela yokusetha i-RTG4 Development Kit kanye ne-GUI ukuze kuqalise idizayini yedemo.

Izilungiselelo Ze-Jumper

1. Xhuma ama-jumper Kukhithi Yokuthuthukisa ye-RTG4, njengoba kuboniswe kuThebula 2.
   Ithebula 2 • Izilungiselelo Ze-Jumper

   I-Jumper	Phina (Kusuka)	Phina (Ku)	Amazwana
   J11, J17, J19, J21, J23, J26, J27, J28	1	2	Okuzenzakalelayo
   J16	2	3	Okuzenzakalelayo
   J32	1	2	Okuzenzakalelayo
   J33	1	3	Okuzenzakalelayo
   	2	4

   Qaphela: Cisha inkinobho kagesi, i-SW6, ngenkathi uxhuma ama-jumpers.

2. Xhuma ikhebula le-USB (i-USB encane kukhebuli ye-USB yohlobo A) ku-J47 ye-RTG4 Development Kit kanye nokunye umkhawulo wentambo embobeni ye-USB ye-PC yokusingatha.
3. Qinisekisa ukuthi izishayeli zebhuloho le-USB kuya ku-UART zitholwa ngokuzenzakalelayo. Lokhu kungaqinisekiswa kusiphathi sedivayisi ye-PC yosokhaya.
   Umfanekiso 4 ubonisa izakhiwo zembobo ye-USB 2.0 kanye ne-COM31 exhunyiwe kanye ne-USB serial converter C.

Umfanekiso 4 • I-USB kuya ku-UART Bridge Driver

Qaphela: Uma izishayeli zebhuloho le-USB kuya ku-UART zingafakiwe, landa futhi ufake abashayeli ukusuka www.microsemi.com//documents/CDM_2.08.24_WHQL_Certified.zip

Umfanekiso wesi-5 ubonisa ukusethwa kwebhodi kokusebenzisa idemo ye-EDAC Kukhithi Yokuthuthukisa ye-RTG4.

Ukuhlela iDemo Design

1. Yethula isoftware ye-Libero SOC.
2. Ukuhlela i-RTG4 Development Kit nomsebenzi file inikezwe njengengxenye yomklamo files usebenzisa isofthiwe ye-FlashPro Express, bheka ku-Appendix 1: Ukuhlela idivayisi usebenzisa i-FlashPro Express,ikhasi 14.
   Qaphela: Uma uhlelo seluqediwe nomsebenzi file ngesofthiwe ye-FlashPro Express, qhubekela ku-EDAC Demo GUI, ikhasi 9. Uma kungenjalo, qhubekela esinyathelweni esilandelayo.
3. Ekugelezeni komklamo we-Libero, chofoza isenzo se-Run Program.
4. Uma ukuhlela sekuqediwe, umaka oluhlaza uyavela phambi kokuthi 'Run Program action' okubonisa ukuhlelwa ngempumelelo komklamo wedemo.

I-EDAC Demo GUI
Idemo ye-EDAC ihlinzekwa nge-GUI esebenziseka kalula, njengoba kuboniswe kuMfanekiso 7, osebenza ku-PC yomsingathi, exhumana ne-RTG4 Development Kit. I-UART isetshenziswa njengephrothokholi yokuxhumana eyisisekelo phakathi kwe-PC ephethe kanye ne-RTG4 Development Kit.

I-GUI iqukethe izigaba ezilandelayo:

1. Ukukhethwa kwembobo ye-COM ukuze kusungulwe uxhumano lwe-UART ku-RTG4 FPGA ngesilinganiso se-baud esingu-115200.
2. Bhala Inkumbulo ye-LSRAM: Ukubhala idatha ye-8-bit ekhelini lememori elishiwo le-LSRAM.
3. I-Memory Scrubbing: Ukuze unike amandla noma ukhubaze ingqondo yokukhuhla.
4. Inkumbulo ye-LSRAM Ifundiwe: Ukufunda idatha ye-8-bit ekhelini lememori elishiwo le-LSRAM.
5. Ukubalwa Kwephutha: Ibonisa isibalo samaphutha futhi inikeza inketho yokusula inani eliphikisayo libe yiziro.
6. Isibalo sephutha le-1-bit: Ibonisa isibalo samaphutha angu-1-bit futhi inikeza inketho yokusula inani eliphikisayo libe yiziro.
7. I-2-bit Isibalo Sephutha: Ibonisa isibalo samaphutha angu-2-bit futhi inikeza inketho yokusula inani eliphikisayo libe yiziro.
8. Idatha Yelogi: Ihlinzeka ngolwazi lwesimo kuwo wonke umsebenzi owenziwe kusetshenziswa i-GUI.

Ukuqalisa iDemo
Izinyathelo ezilandelayo zichaza indlela yokusebenzisa idemo:

1. Iya ku \v1.2.2\v1.2.2\Exe bese uchofoza kabili EDAC_GUI.exe njengoba kuboniswe kuMfanekiso 8.
2. Khetha imbobo ye-COM31 ohlwini bese uchofoza Xhuma.

Umjovo wephutha lebhithi elilodwa nokulungiswa

1. Kumklamo onikeziwe we-Libero, chofoza kabili ku-SmartDebug Design ekugelezeni komklamo.
2. Ku-SmartDebug GUI, chofoza okuthi Susa Iphutha le-FPGA Array.
3. Kuwindi le-Debug FPGA Array, hamba kuthebhu ethi I-Memory Blocks. Izokhombisa ibhulokhi ye-LSRAM ekwakhiweni ngokunengqondo nangokomzimba view. Amabhulokhi anengqondo akhonjiswa ngesithonjana sika-L, futhi amabhlogo aphathekayo aboniswa ngesithonjana sika-P.
4. Khetha isenzakalo sokuvimba ngokomzimba bese uchofoza kwesokudla u-Engeza.
5. Ukuze ufunde i-memory block, chofoza okuthi Funda Block.
6. Faka iphutha lebhithi elingu-1 kudatha engu-8 bit kunoma iyiphi indawo ye-LSRAM kuze kufike ekujuleni okungu-256, njengoba kuboniswe esithombeni esilandelayo lapho kufakwa khona iphutha elingu-1 endaweni engu-0 ye-LSRAM.
7. Chofoza okuthi Bhala Vimba ukuze ubhale idatha eshintshiwe endaweni ehlosiwe.
8. Iya ku-EDAC GUI bese ufaka inkambu Yekheli engxenyeni ethi Funda Inkumbulo ye-LSRAM bese uchofoza okuthi Funda, njengoba kuboniswe emfanekisweni olandelayo.
9. Qaphela I-1 Bit Error Bala futhi Funda izinkambu zedatha ku-GUI. Inani lesibalo samaphutha likhuphuka ngo-1.
   Inkambu ye-Read Data ibonisa idatha elungile njengoba i-EDAC ilungisa iphutha.

Qaphela: Uma ukukhuhla inkumbulo kungavunyelwe, khona-ke isibalo samaphutha siyakhuphuka kukho konke ukufundwa okuvela ekhelini elifanayo le-LSRAM njengoba kubangela iphutha le-1-bit.

Umjovo wephutha le-double bit kanye nokutholwa

1. Yenza isinyathelo 1 ukuya esinyathelweni sesi-5 njengoba sinikezwe kumjovo wephutha lebhithi eyodwa kanye nokulungiswa, ikhasi 10.
2. Faka iphutha le-2-bit kudatha engu-8-bit kunoma iyiphi indawo ye-LSRAM kuze kufike ekujuleni okungu-256, njengoba kuboniswa emfanekisweni olandelayo lapho iphutha le-2-bit lijovwa khona endaweni 'A' ye-LSRAM.
3. Chofoza okuthi Bhala Vimba ukuze ubhale idatha eshintshiwe endaweni ehlosiwe.
4. Iya ku-EDAC GUI bese ufaka inkambu Yekheli engxenyeni ethi Funda Inkumbulo ye-LSRAM bese uchofoza okuthi Funda, njengoba kuboniswe emfanekisweni olandelayo.
5. Qaphela Ukubala Kwephutha okungu-2-bit futhi Funda Izinkambu Zedatha ku-GUI. Inani lesibalo samaphutha likhuphuka ngo-1.
   Inkambu ye-Read Data ibonisa idatha eyonakele.

Zonke izenzo ezenziwe ku-RTG4 zifakwe kusigaba se-Serial Console se-GUI.

Isiphetho
Le demo igqamisa amandla e-EDAC ezinkumbulo ze-RTG4 LSRAM. Iphutha le-1-bit noma iphutha le-2-bit yethulwa nge-SmartDebug GUI. Ukulungisa iphutha le-1-bit kanye nokutholwa kwephutha le-2-bit kubonwa kusetshenziswa i-EDAC GUI.

Ukuhlela idivayisi usebenzisa i-FlashPro Express

Lesi sigaba sichaza indlela yokuhlela idivayisi ye-RTG4 ngomsebenzi wokuhlela file usebenzisa i-FlashPro Express.

Ukuze uhlele idivayisi, yenza lezi zinyathelo ezilandelayo:

1. Qinisekisa ukuthi izilungiselelo ze-jumper ebhodini ziyefana nalezo ezisohlwini lweThebula 3 le-UG0617:
   I-RTG4 Development Kit User Guide.
2. Uma uthanda, i-jumper J32 ingasethwa ukuthi ixhume izikhonkwane ezingu-2-3 uma kusetshenziswa i-FlashPro4, i-FlashPro5, noma i-FlashPro6 yangaphandle esikhundleni sokusetha okuzenzakalelayo kwe-jumper ukuze usebenzise i-FlashPro5 eshumekiwe.
   Qaphela: Iswishi yokuphakela amandla, i-SW6 kumele IVALWE ngenkathi kwenziwa ukuxhumana kwe-jumper.
3. Xhuma ikhebula likagesi kusixhumi se-J9 ebhodini.
4. vula iwishi yokunikeza amandla i-SW6.
5. Uma usebenzisa i-FlashPro5 eshumekiwe, xhuma ikhebula le-USB kusixhumi i-J47 kanye ne-PC yokusingatha.
   Kungenjalo, uma usebenzisa umhleli wangaphandle, xhuma intambo yeribhoni ku-JTAG J22 bese uxhuma umhleli ku-PC ephethe.
6. Ku-PC yokusingatha, vula isofthiwe ye-FlashPro Express.
7. Chofoza Okusha noma khetha Iphrojekthi Yemisebenzi Emisha ku-FlashPro Express Job kusuka kumenyu yephrojekthi ukuze udale iphrojekthi entsha yomsebenzi, njengoba kuboniswe esithombeni esilandelayo.
8. Faka okulandelayo kuphrojekthi Yemisebenzi Emisha evela ebhokisini lengxoxo le-FlashPro Express Job:
   • Umsebenzi wokuhlela file: Chofoza Phequlula, bese uzulazula uye endaweni lapho .job file itholakala bese ukhetha i file. Indawo ezenzakalelayo ithi: \rtg4_dg0703_df\Programming_Job
   • Indawo yephrojekthi ye-FlashPro Express: Chofoza Phequlula futhi uzulazule uye endaweni oyifunayo yephrojekthi ye-FlashPro Express.
9. Chofoza KULUNGILE. Uhlelo oludingekayo file ikhethiwe futhi ilungele ukuhlelwa kudivayisi.
10. Iwindi leFlashPro Express lizovela, qinisekisa ukuthi inombolo yomklami ivela kunkambu yoMhleli. Uma ingakwenzi, qinisekisa ukuxhumana kwebhodi bese uchofoza Vuselela/Skena Kabusha Abahleli.
11. Chofoza okuthi RUN. Uma idivayisi ihlelwe ngempumelelo, isimo se-RUN PASSED siyavezwa njengoba kukhonjisiwe esithombeni esilandelayo.
12. Vala i-FlashPro Express noma chofoza okuthi Phuma kuthebhu yephrojekthi.

Isebenzisa iskripthi se-TCL

Imibhalo ye-TCL inikeziwe ekwakhiweni kwayo files ngaphansi kohla lwemibhalo TCL_Scripts. Uma kudingeka, design
ukugeleza kungenziwa kabusha kusukela Ekusetshenzisweni Kwedizayini kuze kube yilapho kukhiqizwa umsebenzi file.

Ukuze usebenzise i-TCL, landela lezi zinyathelo ezingezansi:

1. Yethula isoftware ye-Libero
2. Khetha Iphrojekthi > Sebenzisa Isikripthi….
3. Chofoza Phequlula bese ukhetha i-script.tcl ohlwini lwemibhalo olulandiwe lwe-TCL_Scripts.
4. Chofoza u-Run.

Ngemva kokukhishwa ngempumelelo kweskripthi se-TCL, iphrojekthi ye-Libero idalwa ngaphakathi kohla lwemibhalo lwe-TCL_Scripts.
Ukuze uthole ulwazi olwengeziwe mayelana nemibhalo ye-TCL, bheka ku-rtg4_dg0703_df/TCL_Scripts/readme.txt.
Bheka ku-Libero® SoC TCL Command Reference Guide ukuze uthole imininingwane eyengeziwe ngemiyalo ye-TCL. Xhumana Nosekelo Lobuchwepheshe nganoma yimiphi imibuzo ohlangabezane nayo lapho usebenzisa umbhalo we-TCL.

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Ukubuyekezwa kwe-Microsemi Proprietary DG0703 4.0

Amadokhumenti / Izinsiza

I-MICROCHIP Ukutholwa Kwephutha Nokulungiswa Kunkumbulo ye-RTG4 LSRAM [pdf] Umhlahlandlela Womsebenzisi Idemo ye-DG0703, Ukutholwa Kwephutha Nokulungiswa ku-RTG4 LSRAM Inkumbulo, Ukutholwa Nokulungiswa Kumemori ye-RTG4 LSRAM, Inkumbulo ye-RTG4 LSRAM, Inkumbulo ye-LSRAM

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