Qhov sib txawv tseem ceeb ntawm synchronous thiab asynchronous DRAM yog tias synchronous DRAM siv lub moos system los tswj lub cim xeeb nkag thaum asynchronous DRAM tsis siv lub moos moos los tswj kev nkag mus rau lub cim xeeb.
Lub computer nco khaws cov ntaub ntawv thiab cov lus qhia. Muaj ob hom kev nco hu ua RAM thiab ROM. RAM stands rau Random Access Memory thaum ROM stands rau Read Only Memory. Lub RAM ntxiv muab faib ua static RAM thiab dynamic RAM. Kab lus no tham txog ob hom dynamic RAM uas yog, synchronous thiab asynchronous DRAM.
DRAM yog dab tsi?
RAM yog lub cim xeeb tsis hloov pauv. Hauv lwm lo lus, cov ntaub ntawv thiab cov lus qhia sau rau RAM tsis tas li. Yog li ntawd, cov ntaub ntawv yuav lwv thaum lub hwj chim tawm ntawm lub computer. Nws tuaj yeem ua tau ob qho tib si nyeem thiab sau cov haujlwm hauv RAM. Ntxiv mus, nws yog ceev thiab kim. Muaj ob hom RAM. Lawv yog Static RAM (SRAM) thiab Dynamic RAM (DRAM). SRAM yuav tsum muaj lub zog tas li kom khaws cov ntaub ntawv thaum DRAM xav kom rov ua dua tshiab kom khaws cov ntaub ntawv. Synchronous DRAM thiab Asynchronous DRAM yog ob hom DRAM.
Daim duab 01: SDRAM
In Synchronous DRAM, lub kaw lus moos tswj xyuas lossis synchronizes lub cim xeeb nkag. Yog li ntawd, CPU paub lub sij hawm los yog pes tsawg lub voj voog uas cov ntaub ntawv yuav muaj los ntawm RAM mus rau lub tswv yim, tso zis tsheb npav. Nws ua kom lub cim xeeb nyeem thiab sau nrawm. Zuag qhia tag nrho, Synchronous DRAM tau nrawm dua thiab ua haujlwm tau zoo dua li DRAM ib txwm.
Asynchronous DRAM yog dab tsi?
Thawj lub khoos phis tawj tus kheej siv asynchronous DRAM. Nws yog ib qho qub version ntawm DRAM. Hauv asynchronous DRAM, lub kaw lus moos tsis ua haujlwm lossis synchronizes lub cim xeeb nkag. Thaum nkag mus rau lub cim xeeb, tus nqi tshwm rau ntawm lub tswv yim, tso zis tsheb npav tom qab qee lub sijhawm. Yog li ntawd, nws muaj qee qhov latency uas txo qhov nrawm.
Feem ntau, asynchronous RAM ua haujlwm hauv lub cim xeeb qis tab sis tsis tsim nyog rau cov tshuab nco ceev niaj hnub no. Tam sim no, kev tsim cov asynchronous RAM yog tsawg heev. Niaj hnub no, synchronous DRAM yog siv los ntawm asynchronous DRAM.
Qhov txawv ntawm Synchronous thiab Asynchronous DRAM yog dab tsi?
Synchronous DRAM siv lub moos kaw lus los tswj lub cim xeeb nkag mus thaum Asynchronous DRAM tsis siv lub moos kaw lus los synchronize lossis tswj kev nco nkag. Synchronous DRAM sai dua thiab ua tau zoo ces asynchronous DRAM.
Tsis tas li ntawd, synchronous DRAM muab kev ua haujlwm siab thiab tswj tau zoo dua li asynchronous DRAM. Niaj hnub nimno high-speed PCs siv synchronous DRAM thaum laus qis-ceev PCs siv asynchronous DRAM.
Summary – Synchronous vs Asynchronous DRAM
Qhov txawv ntawm synchronous thiab asynchronous DRAM yog tias synchronous DRAM siv lub moos system los tswj lub cim xeeb nkag thaum asynchronous DRAM tsis siv lub moos moos los tswj lub cim xeeb nkag. Hauv luv luv, lub synchronous DRAM muab kev tswj zoo dua thiab kev ua haujlwm siab dua li asynchronous DRAM.
