Latch vs Flip-Flop
Latch thiab flip flops yog lub tsev tsim cov txheej txheem sib txuas lus, yog li lub cim xeeb. Ib qho kev sib txuas ntawm cov logic Circuit Court yog ib hom digital circuit uas teb tsis yog rau cov khoom siv tam sim no, tab sis rau lub xeev tam sim no (lossis yav dhau los) ntawm Circuit Court. Yuav kom ua tiav qhov haujlwm no, lub voj voog yuav tsum muaj peev xwm khaws nws lub xeev raws li cov ntaub ntawv binary.
Ntau txog Latches
Cov cuab yeej tseem ceeb ntawm lub cim xeeb yog tias, nws yuav tsum tuaj yeem khaws nws cov txiaj ntsig ntawm lub xeev ruaj khov kom txog thaum nws tau qhia kom hloov pauv. Txoj haujlwm no yog muab los ntawm bistable logic circuit. Cias muab, nws muaj ob lub xeev ruaj khov; ib lub xeev Set thiab Reset xeev. Los ntawm lub rooj sib tham, lub xeev teeb pom kev zoo suav tias yog 1 thiab rov pib lub xeev yog suav tias yog 0. Cov khoom siv hluav taws xob zoo li no hu ua latch; Zoo sib xws rau cov cuab yeej siv tshuab latching cov khoom mus rau qhov chaw ruaj khov.
Basic Set-Reset latch (SR latch) yog daim ntawv yooj yim tshaj plaws ntawm bistable circuits. JK thiab D latches yog ob hom latches. Lawv txoj haujlwm tau yooj yim qhia los ntawm lub rooj tseeb. Nws yog ib qho kev sawv cev ntawm txhua qhov tshwm sim tau rau cov tswv yim sib txawv.
Ib qho yooj yim latch hloov nws tus nqi thaum twg muab cov tswv yim raug. Qhov no ua rau muaj teeb meem rau kev tswj cov ntaub ntawv me ntsis khaws cia hauv lub latch hauv lub voj voog loj. Kev tswj ntau dua rau bistable Circuit Court tuaj yeem qhia los ntawm kev hla txhua qhov kev tawm tswv yim los ntawm AND rooj vag. Los ntawm kev tswj lub AND rooj vag siv lwm lub teeb liab, cov tswv yim tuaj yeem tso cai ntawm cov xwm txheej uas xav tau. Qhov kev tawm tswv yim ntxiv no yog hu ua Enable, thiab lub latch teeb tsa hauv qhov no yog lub npe hu ua clocked latch lossis gated latch. Feem ntau qhov Enable yog tswj los ntawm lub moos, uas yog lub teeb liab digital nrog lub sijhawm xav tau ntawm siab (1) thiab qis (0) xeev.
Rau lub clocked D-latch, thaum twg lub moos nyob rau hauv lub xeev siab, cov zis xav tias lub xeev siab rau txhua lub xeev siab ntawm inputs. Tus cwj pwm no hu ua pob tshab. Hauv qee daim ntawv thov, pob tshab ntawm cov latches yog qhov tsis zoo.
Ntau txog Flip-Flops
Nws yog ib qho tsim nyog yuav tsum muaj peev xwm ua piv txwv cov tswv yim ntawm qhov tshwj xeeb tam sim thiab khaws tus nqi sab hauv. Vim yog lub pob tshab, lub latch teb rau txhua qhov xwm txheej tshwm sim hauv lub xeev siab ntawm lub moos. Raws li kev daws teeb meem, bistable circuits tshwm sim ntawm ntug nce lossis poob ntug ntawm lub moos mem tes tuaj yeem siv. Cov circuits no hu ua flip-flops, uas yog synchronous nrog ntug ntawm lub moos mem tes. Yog li ntawd, Flip-Flops tseem hu ua synchronous bistable multivibrator circuits. Ntawm qhov tod tes, latches yog asynchronous bistable multivibrator circuits.
Txoj kev ua haujlwm ntawm latches, SR, JK, D, thiab T flips flops kuj tsim.
Dab tsi yog qhov txawv ntawm Latches thiab Flip Flops?
• Lub latch yog asynchronous bistable multivibrator circuit, thiab flip-flop yog synchronous bistable multivibrator circuit.
• Hauv latches, lub xeev khaws cia tuaj yeem hloov pauv thaum lub sijhawm ua haujlwm siab, tab sis hauv flip flops, lub xeev khaws cia tuaj yeem hloov pauv tsuas yog ntawm ntug nce lossis poob ntug ntawm lub moos teeb tsa. raws li cov tswv yim ntawm lub enable.
