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DDR se ke yo rele tou doub-pousantaj SDRAM Doub Dat To SDRSM. DDR SDRAM se yon gwo vitès CMOS memwa ak aksè dinamik o aza. Asosyasyon Teknoloji Solid Eta JEDEC Ozetazini te pibliye Double Done To Synchronous Dynamic Memory (DDR SDRAM) spesifikasyon JESD79 nan mwa Jen 2000. Transmisyon done yo ka fèt sou kwen siperyè ak pi ba nan kwen deklanche revèy la, se konsa lajè a ka rive nan 2.128GB / s menm nan yon frekans otobis nan 133MHz. DDR pa sipòte 3.3V LVTTL men sipòte 2.5V SSTL2 estanda. Li ka toujou itilize jodi a. Pri fabrikasyon nan yon sistèm pwodiksyon ak SDRAM se yon ti kras pi wo pase sa yo ki an SDRAM men byen lwen mwens pase pri a nan Ranbo. Memwa DDR reprezante yon direksyon devlopman memwa ki ka fè konpetisyon ak Rambu nan lavni.
DDR2 (Double Done To 2) SDRAM se yon nouvo teknoloji jenerasyon memwa estanda devlope pa JEDEC (Joint Elektwonik Ekipman Jeni Komite). Pi gwo diferans ki genyen ant li ak jenerasyon anvan DDR memwa teknoloji estanda a se ke byenke menm bagay la tou itilize revèy la k ap monte / Metòd debaz la nan transmisyon done pandan y ap tonbe reta, men DDR2 memwa gen de fwa kapasite a pre-li nan jenerasyon anvan an memwa DDR ( sètadi: done 4bit li pre-chache). Nan lòt mo, memwa DDR2 ka li / ekri done nan 4 fwa vitès otobis ekstèn lan pou chak revèy, epi li ka kouri nan 4 fwa vitès otobis kontwòl entèn la.
1. Fondamantal:
400 nan DDR400 refere a Pleasant memwa a, ki se yon valè konvèti nan frekans fonksyònman an. Memwa DDR400 kouri nan yon frekans revèy nan 200MHz, ak DDR ka jwenn aksè nan done de fwa pou chak sik revèy, kidonk li ekivalan a kouri nan 400MHz (200MHz × 2). Algoritm nan menm, memwa DDR2 533, kouri nan 133MHz, kapab jwenn aksè nan done kat fwa pou chak sik revèy, ki ekivalan a 533MHz (133MHz × 4).
Natirèlman, pi gwo a valè a ak pi wo a frekans lan, pi vit nan vitès la memwa pral definitivman dwe. Frekans nan memwa DDR400 se fèmen nan limit la. Li evidan DDR2 kouri nan yon frekans pi ba anpil pase memwa DDR, men li ka bay pi bon pèfòmans, kidonk li pral endikap la nan de pwochen ane yo.
DDR3, 4 memwa ki deja disponib, ki se de fwa osi vit ke DDR2. Kounye a, li se sitou itilize pou kat grafik ak kondisyon vitès ki pi wo pou memwa videyo. Li pral definitivman dwe piti piti itilize pou memwa prensipal nan tan kap vini an.
lòt pwodwi nou an:
Pwofesyonèl pakè ekipman estasyon radyo FM
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