Printed circuit board (PCB) prototyping nrog high-speed memory interfaces tuaj yeem ua haujlwm nyuaj. Cov neeg tsim qauv feem ntau ntsib teeb meem kom ntseeg tau cov teeb liab kev ncaj ncees, txo qis suab nrov, thiab ua tiav kev ua haujlwm siab. Txawm li cas los xij, nrog txoj hauv kev thiab cov cuab yeej zoo, nws muaj peev xwm kov yeej cov kev cov nyom no thiab ua tiav cov qauv PCBs rau kev sib txuas ceev ceev.
Hauv tsab ntawv blog no, peb yuav tshawb txog ntau yam txuj ci thiab kev coj ua zoo tshaj plaws rau PCB prototyping siv lub cim xeeb nrawm nrawm. Peb yuav tham txog cov teeb liab kev ncaj ncees, txo suab nrov, thiab qhov tseem ceeb ntawm kev xaiv cov khoom tsim nyog. Yog li, cia peb dhia mus rau hauv lub ntiaj teb ntawm kev kub ceev nco interface prototyping!
Kawm txog cov teeb liab kev ncaj ncees
Lub teeb liab kev ncaj ncees plays lub luag haujlwm tseem ceeb hauv kev kub ceev nco interface tsim. Nws hais txog qhov zoo ntawm cov teeb liab hluav taws xob dhau los ntawm PCB kab thiab cov khoom sib txuas. Txhawm rau kom muaj kev ncaj ncees ntawm lub teeb liab, nws yog ib qho tseem ceeb uas yuav tsum xav txog yam xws li impedance txuam, kev txiav tawm, thiab kev tswj impedance routing.
Kev sib txuam impedance yog qhov tseem ceeb rau kev tiv thaiv cov teeb meem kev xav uas tuaj yeem ua rau cov ntaub ntawv kev noj nyiaj txiag thiab teeb meem sijhawm. Nws suav nrog kev tsim cov kab sib kis nrog cov yam ntxwv impedance uas phim qhov chaw thiab thauj khoom impedances. Cov cuab yeej software xws li Altium Designer thiab Cadence Allegro tuaj yeem pab suav thiab txheeb xyuas qhov impedance qhov tseem ceeb ntawm cov cim tseem ceeb.
Termination technology yog siv los tshem tawm cov teeb liab reflections thiab xyuas kom meej lub teeb liab hloov dua siab tshiab. Cov txheej txheem kev txiav tawm nrov muaj xws li kev txiav tawm series, kev txiav tawm thaum uas tig mus, thiab kev txiav qhov sib txawv. Qhov kev xaiv ntawm kev txiav tawm yog nyob ntawm qhov tshwj xeeb nco interface thiab qhov yuav tsum tau muaj teeb liab zoo.
Kev tswj cov impedance routing yuav tsum tswj xyuas qhov sib npaug ntawm qhov dav, qhov sib nrug, thiab txheej txheej kom ua tiav qhov tshwj xeeb impedance tus nqi. Qhov no yog qhov tseem ceeb rau kev ceev ceev ceev interfaces vim nws pab txo cov teeb liab degradation thiab tswj cov teeb liab kev ncaj ncees.
Tsawg suab nrov
Suab nrov yog yeeb ncuab ntawm kev kub ceev nco interfaces. Nws tuaj yeem ua rau cov ntaub ntawv tsis raug, qhia txog kev ua yuam kev, thiab txo qis kev ua haujlwm tag nrho. Txhawm rau txo qis suab nrov, cov txheej txheem hauv av kom raug, decoupling capacitors, thiab kev txheeb xyuas cov khoom siv hluav taws xob ncaj ncees yog qhov tseem ceeb.
Cov txheej txheem hauv av suav nrog tsim lub dav hlau hauv av thiab txo qis hauv av voj voog. Lub dav hlau hauv av ruaj khov pab tiv thaiv lub suab nrov los ntawm cov khoom nyob ib sab thiab txo cov lus sib dhos. Cov cheeb tsam hauv av yuav tsum tau txo qis los ntawm kev tsim ib qho kev sib txuas hauv av rau tag nrho cov khoom.
Decoupling capacitors yog siv los nqus cov suab nrov nrov thiab ua kom lub zog ruaj khov. Muab decoupling capacitors nyob ze ntawm lub cim xeeb ceev ceev thiab lwm yam tseem ceeb yog qhov tseem ceeb rau kev muab lub zog huv si thiab txo qis suab nrov.
Kev txheeb xyuas lub zog ncaj ncees pab txheeb xyuas cov teeb meem muaj peev xwm faib hluav taws xob. Cov cuab yeej xws li SIwave, PowerSI, thiab HyperLynx muab lub peev xwm simulation los txheeb xyuas cov khoom siv hluav taws xob thiab txheeb xyuas thaj chaw uas xav tau kev hloov kho kom zoo.
Kev xaiv cov khoom siv
Xaiv cov khoom tsim nyog rau kev kub ceev nco interface prototyping yog qhov tseem ceeb. Cheebtsam uas ua tau raws li qhov yuav tsum tau ua kom nruj hluav taws xob thiab lub sijhawm yog qhov tseem ceeb kom ntseeg tau tias kev xa cov ntaub ntawv muaj tseeb thiab raug. Cov ntsiab lus tseem ceeb thaum xaiv cov khoom muaj xws li:
1. Nco Chip:Txheeb xyuas lub cim xeeb chips tsim los rau kev sib txuas ceev ceev thiab muab lub peev xwm thiab kev ua tau zoo. Cov kev xaiv nrov suav nrog DDR4, DDR5, LPDDR4 thiab LPDDR5.
2. Cov khoom sib txuas:Siv cov khoom sib txuas zoo uas tuaj yeem tswj cov teeb liab nrawm yam tsis ua rau lub teeb liab attenuation. Xyuas kom cov connectors tsis muaj qhov tsis zoo, tsis muaj crosstalk thiab EMI kev ua tau zoo.
3. Clock ntaus ntawv:Xaiv cov khoom siv moos uas tuaj yeem muab lub cim moos ruaj khov thiab raug. PLL-raws li moos generators lossis siv lead ua oscillators feem ntau yog siv rau kev kub ceev ceev interfaces.
4. Passive Cheebtsam:Xaiv cov khoom siv passive xws li resistors, capacitors, thiab inductors uas ua tau raws li qhov yuav tsum tau muaj rau impedance, capacitance, thiab inductance qhov tseem ceeb.
Cov cuab yeej Prototyping thiab cov txheej txheem
Tam sim no peb tau tham txog cov kev xav tseem ceeb rau kev tsim lub cim xeeb nrawm nrawm, nws yog lub sijhawm los tshawb txog cov cuab yeej prototyping thiab cov tswv yim muaj rau cov neeg tsim qauv PCB. Qee cov cuab yeej siv dav thiab cov txheej txheem suav nrog:
1. PCB tsim software:Siv cov software tsim PCB siab heev xws li Altium Designer, Cadence Allegro, lossis Eagle los tsim PCB layouts. Cov cuab yeej software no muab cov cai tsim kev kub ceev, lub tshuab xam zauv impedance, thiab simulation peev xwm los xyuas kom meej lub teeb liab.
2. Cov khoom siv ntsuas kub ceev:Siv cov cuab yeej ntsuas kub ceev xws li oscilloscopes, logic analyzers, thiab cov teeb liab generators los xyuas thiab debug lub cim xeeb interface tsim. Cov cuab yeej no pab ntes thiab txheeb xyuas cov teeb liab, ntsuas cov teeb liab ncaj ncees, thiab txheeb xyuas cov teeb meem.
3. PCB Manufacturing Services:Koom tes nrog txhim khu kev qha PCB tsim cov kev pab cuam uas tshwj xeeb hauv kev kub ceev thiab high-density PCB manufacturing. Cov tuam ntxhab no xyuas kom meej meej, raug thiab zoo hauv kev tsim qauv.
4. Teeb liab kev ntseeg siab simulation:Siv cov cuab yeej xws li HyperLynx, SIwave, los yog Cadence Sigrity los ua cov teeb liab kev ncaj ncees simulation los xyuas qhov tsim, txheeb xyuas cov teeb meem muaj peev xwm ncaj ncees, thiab txhim kho txoj hauv kev kom txo qis cov teeb liab degradation.
Los ntawm kev siv cov cuab yeej thiab cov tswv yim no, koj tuaj yeem nce qhov kev vam meej ntawm koj lub cim xeeb ceev interface prototyping kev siv zog. Nco ntsoov rov hais dua, sim, thiab txhim kho koj tus qauv tsim kom pom kev ua tau zoo.
Hauv kev xaus
Tsim thiab prototyping PCB nrog lub cim xeeb nrawm nrawm tuaj yeem ua haujlwm txaus ntshai. Txawm li cas los xij, los ntawm kev nkag siab txog cov ntsiab cai ntawm kev ncaj ncees, txo qis suab nrov, xaiv cov khoom tsim nyog, thiab siv cov cuab yeej prototyping thiab cov tswv yim zoo, koj tuaj yeem ua kom muaj kev ua tiav.
Kev txiav txim siab xws li impedance txuam, txiav cov txheej txheem, tswj impedance routing, tsim nyog grounding, decoupling capacitors, thiab lub hwj huam mov kev ntsuam xyuas kev ncaj ncees yog ib qho tseem ceeb rau kev ua tiav cov teeb liab kev ncaj ncees thiab txo cov suab nrov. Ua tib zoo xaiv cov khoom thiab kev koom tes nrog cov chaw tsim khoom PCB txhim khu kev qha yog qhov tseem ceeb rau kev ua tiav lub cim xeeb ua haujlwm siab.
Yog li ntawd, siv sij hawm los npaj, tsim, thiab qauv koj lub siab ceev ceev interface PCB, thiab koj yuav ua tau zoo raws li qhov xav tau ntawm cov tshuab hluav taws xob niaj hnub no. Zoo siab prototyping!
Post lub sij hawm: Oct-28-2023
Rov qab
