I-Microsemi SmartFusion2 FIFO Isilawuli esingenawo Umhlahlandlela Womsebenzisi Wokucushwa Kwememori
Isingeniso
Isilawuli se-FIFO ngaphandle kweMemori sikhiqiza kuphela ingqondo yesilawuli se-FIFO. Lo mgogodla uhloselwe ukusetshenziswa kanye ne-Two-Port Large SRAM noma i-Micro SRAM. Isilawuli se-FIFO esingenayo iMemori sizimele ekujuleni nobubanzi be-RAM Blocks. I-FIFO Controller without Memory inombudumbudu wendawo ye-RAM eyodwa namafulegi angenalutho / agcwele. Isekela izimbobo eziningi zesimo ozikhethela zona ukuze kukhule ukubonakala nokusebenziseka. Lezi zimbobo ozikhethela zona zichazwe kabanzi ezigabeni ezingezansi. Kulo mbhalo, sichaza ukuthi ungasimisa kanjani isilawuli se-FIFO ngaphandle kwesibonelo seMemori futhi uchaze ukuthi amasiginali axhumeke kanjani.
1 Ukusebenza
Bhala Ukujula/Ububanzi bese Ufunda Ukujula/Ububanzi
Ibanga lokujula lembobo ngayinye ngu-1-99999. Ububanzi bobubanzi bembobo ngayinye ngu-1-999. Izimbobo ezimbili zingalungiselelwa ngokuzimele nganoma yikuphi ukujula nobubanzi. (Bhala Ukujula * Bhala Ububanzi) kufanele kulingane (Funda Ukujula * Funda Ububanzi).
Iwashi Elilodwa (CLK) noma Amawashi Okubhala Nokufunda Azimele (WCLOCK, RCLOCK)
I-FIFO Controller without Memory inikeza idizayini ekabili- noma yewashi elilodwa. Idizayini yewashi elikabili ivumela izizinda ezizimele zokufunda nokubhala. Ukusebenza esizindeni esifundwayo kuvumelana newashi elifundwayo, futhi ukusebenza esizindeni sokubhala kuvumelana newashi lokubhala. Ukukhetha inketho yewashi elilodwa kubangela umklamo olula, omncane futhi osheshayo. Ukucushwa okuzenzakalelayo kwe-FIFO Controller without Memory iwashi Elilodwa (CLK) ukushayela i-WCLOCK ne-RCLOCK ngewashi elifanayo. Susa ukumaka ibhokisi lokuhlola lewashi Elilodwa ukuze ushayele amawashi azimele (lilodwa ngalinye elokuthi Bhala futhi Ufunde). I-Clock Polarity - Chofoza imicibisholo eya phezulu noma phansi ukuze ushintshe unqenqema olusebenzayo lwewashi lakho elithi Bhala Nokufunda. Uma usebenzisa iwashi elilodwa ungakhetha ku-CLK kuphela; uma usebenzisa amawashi azimele ungakhetha i-polarity yakho kokubili i-WCLOCK ne-RCLOCK.
Bhala Vumela (WE)
SIlawula ukuthi idatha yokubhala ibhalwa nini Ekhelini Lokubhala (MEMWADDR) le-RAM onqenqemeni lwewashi. WE Polarity - Chofoza imicibisholo eya phezulu noma phansi ukuze ushintshe unqenqema olusebenzayo lwesiginali ye-WE.
Funda Vumela (RE)
Ukugomela i-RE kubangela ukuthi idatha ye-RAM endaweni yekheli elifundiwe (MEMRADDR) ifundwe. I-RE Polarity - Chofoza imicibisholo eya phezulu noma phansi ukuze ushintshe unqenqema olusebenzayo lwesiginali ye-RE.
Vumela Bhala uma i-FIFO isigcwele
Khetha leli bhokisi lokuthikha ukuze unike amandla i-FIFO ukuthi iqhubeke nokubhala uma isigcwele. Inani lakho le-FIFO elikhona lizocishwa.
Vumela ukufunda uma i-FIFO Ingenalutho
Khetha leli bhokisi lokuhlola ukuze unike amandla i-FIFO ukuthi iqhubeke ifunde uma ingenalutho.
Ukusetha Kabusha Okungavumelani (SETHA KABUSHA)
Ukugomela isignali esebenzayo ephansi ye-RESET kusetha kabusha Isilawuli se-FIFO ngaphandle kweMemori. SETHA KABUSHA I-polarity - Chofoza imicibisholo eya phezulu noma phansi ukuze ushintshe unqenqema olusebenzayo lwesiginali ye-RESET.
Ikhiqiza Amafulegi kusilawuli se-FIFO ngaphandle kweMemori
Amafulegi kusilawuli se-FIFO ngaphandle kweMemori akhiqizwa ngendlela elandelayo:
- Amafulegi Agcwele, Angenalutho, Acishe Agcwele, futhi Acishe Angenalutho ayimiphumela ebhalisiwe yale mojula.
- Amafulegi Acishe Agcwele Futhi Acishe Angenalutho ayizimbobo ozikhethela zona; ungasetha amanani omkhawulo ngokwezibalo noma ngokushintshashintshayo.
- Ukusetha inani elimile le-threshold: yeka ukukhetha ibhokisi lokuhlola eduze kwembobo ye-AFVAL noma ye-AEVAL; lokhu kukhubaza izimbobo futhi kunika amandla ibhokisi lokulawula umbhalo eduze kwe-AFULL / AEMPTY port(ama). Faka umkhawulo wakho omile owufisayo kulo mkhakha.
- Ukusetha inani eliguqukayo lomngcele, khetha ibhokisi(ama) ibhokisi eduze kwembobo ye-AFVAL noma ye-AEVAL, lokhu kuvumela ukukhiqizwa okuyinhloko ngebhasi elilodwa noma womabili. Ungabe usufaka amanani omkhawulo owathandayo. - Ifulegi Eligcwele ligonyelwa ewashini elifanayo ukuthi kubhaliwe idatha egcwalisa i-FIFO.
- Ifulegi elingenalutho liyagonyelwa ewashini elifanayo ukuthi idatha yokugcina ifundwa ku-FIFO.
- Ifulegi Elicishe Liphelele ligonyelwa ewashini elifanayo lapho umkhawulo okufinyelelwe khona.
- Ifulegi elicishe lingenalutho ligonyelwa ewashini elifanayo lapho umkhawulo okufinyelelwe khona. Okwesiboneloample, uma ucacisa umkhawulo ocishe ungenalutho ongu-10, ifulegi ligomela ewashini elifanayo lokufunda elibangela ukuthi i-FIFO iqukathe izici eziyi-10.
2 Indawo kanye nesivinini kusilawuli se-FIFO
Usayizi kanye nemvamisa yokusebenza yesilawuli se-FIFO kuncike ekucushweni nasezicini ozikhethela zona ezinikwe amandla; Qaphela ukuthi:
- Umklamo wewashi elilodwa uzoba mncane futhi ngokushesha; lokhu kungenxa yokuthi ama-synchronizer kanye nesifaki khodi/izikhiphi ezimpunga azidingeki.
- Ukujula kwembobo okungewona amandla angu-2 kuzokhiqiza idizayini enkulu futhi ehamba kancane. Isizathu siwukuthi ukulungiselelwa okunengqondo kwenzeka ngamandla-oku-2 ukujula. Ngakho, uma udinga 66 x 8 FIFO, kungase kube advan ngaphezulutagkulula ukukhetha ukujula kwe-FIFO okungu-64 noma 128 uma indawo kanye/noma isivinini siwukukhathazeka.
3 Imidwebo Yesikhathi
Bhala Ukusebenza
Ngesikhathi somsebenzi wokubhala lapho isignali ye-WE igonyelwa i-FIFO igcina inani lebhasi le-DATA kumemori. Isignali ye-WACK igonyelwa isikhathi ngasinye lapho umsebenzi wokubhala ngempumelelo kwenzeka ku-FIFO. Uma i-FIFO igcwalisa, ifulegi Eligcwele liyagonyelwa libonisa ukuthi ayisekho idatha engabhalwa. Ifulegi elithi AFULL liyagonyelwa uma inani lezinto ku-FIFO lilingana nenani lomkhawulo. Uma umsebenzi wokubhala uzanywa ngenkathi i-FIFO igcwele, isignali ethi OVERFLOW igonyelwa kumjikelezo wewashi olandelayo, okubonisa ukuthi kwenzeke iphutha. Isiginali ye-VERFLOW iyagonyelwa ngomsebenzi ngamunye wokubhala ohlulekayo. A sampUmdwebo wesikhathi we-FIFO onokucushwa kokujula kuka-4, inani elicishe liphelele limiswe ukuze libe ku-3, kanye nonqenqema lwewashi elikhuphukayo liboniswa kuMfanekiso 3-1.
Funda Ukusebenza
Ngesikhathi somsebenzi wokufunda lapho isignali ye-RE igonyelwa i-FIFO ifunda inani ledatha ebhasini le-Q lisuka kumemori. Idatha iyatholakala kuklayenti imijikelezo yewashi emibili ngemva kokugomela kwe-RE, le datha ibanjelwa ebhasini kuze kugonyelwe i-RE elandelayo. Isiginali ye-DVLD igonyelwa kumjikelezo wewashi ofanayo wokuthi idatha iyatholakala. Ngakho-ke, ingqondo yeklayenti ingaqapha isignali ye-DVLD ukuze ibonise idatha evumelekile. Nokho, i-DVLD igomela kuphela ngomjikelezo wewashi wokuqala ukuthi idatha entsha iyatholakala, kuyilapho idatha yangempela isengaba sebhasini ledatha. Uma i-FIFO ithululwa lapho ifulegi le-EMPTY liyagonyelwa ukuze libonise ukuthi awasekho ama-elementi edatha angafundwa. Ifulegi le-AEMPTY liyagonyelwa uma inani lezinto ku-FIFO lilingana nenani elimisiwe lomkhawulo. Uma umsebenzi wokufunda uzama ngenkathi i-FIFO ingenalutho, isignali ethi UNDERFLOW igonyelwa kumjikelezo wewashi olandelayo obonisa ukuthi kwenzeke iphutha. Isignali ethi UNDERFLOW igonyelwa ngomsebenzi ngamunye wokufunda ohlulekayo.
A sampUmdwebo wesikhathi we-FIFO onokucushwa kokujula kuka-4, inani elicishe libe elingenalutho elibekwe ku-1, kanye nonqenqema lwewashi elikhuphukayo liboniswa kuMfanekiso 3-2.
Imisebenzi ene-variable Aspect Ratio
I-FIFO enobubanzi besici esiguquguqukayo inokucushwa okuhlukile kokujula nobubanzi bohlangothi lokubhala nokufunda. Kukhona ukucatshangelwa okukhethekile lapho usebenzisa lolu hlobo lwe-FIFO:
Ukuhleleka kwedatha - Uhlangothi lokubhala lunobubanzi obuncane kunohlangothi olufundiwe: I-FIFO iqala ukubhala engxenyeni ebaluleke kakhulu yememori phezulu. (bheka umdwebo wesikhathi ongezansi)
- Ukuhleleka kwedatha - Uhlangothi Lokubhala lunobubanzi obukhulu kunohlangothi olufundwayo, okungukuthi i-FIFO iqala ukufunda engxenyeni encane yememori. Okusho ukuthi uma igama lokuqala ohlangothini lokubhala lithi 0xABCD, amagama afundwa ku-FIFO azoba ngu-0xCD alandelwe ngu-0xAB.
- Ukukhiqizwa kwefulegi eligcwele - I-FULL iyagonyelwa uma igama eligcwele elisuka endleleni yokubhala lingakwazi ukubhalwa ngalo. I-FULL ayigonyelwa kuphela uma kunesikhala esanele ku-FIFO sokubhala igama eligcwele elisuka esilinganisweni sesici sokubhala. (bheka umdwebo wesikhathi kuMfanekiso 3-3)
- Ukukhiqizwa kwefulegi elingenalutho - I-EMPTY ayigonyelwa kuphela uma igama eligcwele elivela ku-aspect ratio efundiwe lingafundwa. I-EMPTY iyagonyelwa uma i-FIFO ingenalo igama eligcwele elisuka ku-aspect ratio efundiwe (bheka umdwebo wesikhathi kuMfanekiso 3-3).
- Okushiwo ukukhiqizwa kwefulegi lesimo ukuthi kungenzeka ukuthi kube negama eliyingxenye ku-FIFO okungenzeka lingabonakali ngokushesha ohlangothini olufundiwe. Okwesiboneloample, cabanga lapho uhlangothi lokubhala lunobubanzi obuncane kunohlangothi olufundiwe. Ihlangothi lokubhala libhala igama eli-1 bese liqeda. Kulolu hlobo lwesimo, uhlelo lokusebenza olusebenzisa i-FIFO kufanele lucabange ukuthi igama ledatha eliyingxenye limele ini.
- Uma igama ledatha eliyingxenye lingakwazi ukucutshungulwa phansi komfula kunalokho kungenangqondo ukulikhipha ku-FIFO kuze kube yilapho selifinyelele igama eligcwele. Kodwa-ke, uma igama eliyingxenye lithathwa njengelivumelekile futhi lingacutshungulwa phansi komfula esimweni salo 'sokungapheleli', khona-ke olunye uhlobo lwendlela yokusebenza ludinga ukuklanywa ukuze kusingathwe lesi simo.
Umfanekiso 3-3 ubonisa isimo lapho uhlangothi lokubhala lucushwa lube nobubanzi buka-x4 kanye nohlangothi olufundwayo njengobubanzi buka-x8.
4 Incazelo Yembobo
Ithebula 4-1 libala isilawuli se-FIFO ngaphandle kwamasiginali weMemori kumakhro akhiqiziwe.
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Amadokhumenti / Izinsiza
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I-Microsemi SmartFusion2 FIFO Controller ngaphandle kokucushwa kweMemori [pdf] Umhlahlandlela Womsebenzisi I-SmartFusion2 FIFO Controller ngaphandle kokucushwa kweMemori, i-SmartFusion2, isilawuli se-FIFO ngaphandle kokucushwa kweMemori, ukucushwa kweMemori |
