Ukunakwa kufanele kunikezwe PCB design

Umbono oyiphutha 1: izidingo zokuklanywa kwe-PCB zaleli bhodi aziphakeme, ngakho-ke sebenzisa ucingo olucekeceke nendwangu ezenzakalelayo.

Beka amazwana ku: Izintambo ezizenzakalelayo kufanele zithathe indawo enkulu ye-PCB, ngasikhathi sinye, izikhathi eziningi ukwedlula imbobo yokufaka izintambo, enkulu emikhiqizweni yeqoqo, intengo yomkhiqizi we-PCB ecubungula izici ngaphezu kwezici zebhizinisi, ububanzi bomugqa nenombolo yezimbobo, ezithinta isivuno se-PCB nokusetshenziswa kwenombolo encane, gcina izindleko zomhlinzeki, futhi unikeze inani ukuthola isizathu.

Inganekwane 2: Lezi zimpawu zebhasi zidonswa ngama-resistors ukuze zizizwe ziphephile.

Amazwana: Amasiginali adinga ukudonswa phansi naphansi ngenxa yezizathu eziningi, kodwa hhayi zonke. Donsa ukumelana nokudonsela phansi naphansi kwesiginali eyodwa yokufaka, i-current ingaphansi kwama-microamp ambalwa, kepha isignali yokushayela, i-current izofinyelela kuma-milliamperes, manje isistimu ivame ukuba idatha yedatha engama-32-bit, kungahle kube ne-244/245 ngemuva ukuhlukaniswa kwebhasi nolunye uphawu, kuyadonswa, ama-watts ambalwa wokusebenzisa amandla ekumelaneni.

Amazwana: Uma itheku le-I / O elingasetshenziswanga limisiwe, ukuphazamiseka okuncane okuvela ngaphandle kungaba yisiginali yokufaka yokukhishwa okuphindaphindwayo, futhi ukusetshenziswa kwamandla kwamadivayisi we-MOS ngokuyisisekelo kuncike enanini lesango elijikijelwayo. Uma uyidonsa, iphini ngalinye lizophinda libe nama-microamperes wamanje, ngakho-ke indlela engcono ukuyibeka ekukhishweni (kunjalo, ayikho enye isignali eqhutshwa ngaphandle).

Inganekwane 4: Kuneminyango eminingi kakhulu esele kule FPGA, ngakho-ke masikwenze

Amazwana: Ukusetshenziswa kwamandla kwe-FGPA kulingana nenani lama-flip-flops asetshenzisiwe kanye nenombolo yama-flips, ngakho-ke ukusetshenziswa kwamandla kwemodeli efanayo ye-FPGA kungahluka ngezikhathi eziyi-100 kumasekethe ahlukene ngezikhathi ezahlukahlukene. Ukunciphisa inani lama-flip-flops ngesivinini esikhulu kuyindlela eyisisekelo yokunciphisa ukusetshenziswa kwamandla we-FPGA.

Inganekwane 5: Ukusetshenziswa kwamandla kwala machips amancane kuphansi kakhulu ukuthi ungakhathazeka ngakho

Beka amazwana ku: I-ABT16244 idla ngaphansi kuka-1 ma ngaphandle komthwalo, kepha inkomba yayo ukuthi iphini ngalinye lingashayela umthwalo we-60mA (njengokumelana namashumi amashumi we-ohm), okungukuthi, ukusetshenziswa kwamandla okuphezulu kwe-60 * 16 = 960mA ngokuphelele umthwalo. Vele, kumane nje kungukuthi amandla wamandla aqinile kangangokuba ukushisa kwehla emthwalweni.

Inganekwane 6: Kunezimpawu eziningi zokulawula kwimemori, ngidinga ukusebenzisa kuphela amasiginali we-OE kanye NATHI kuleli bhodi, ukuze idatha izophuma ngokushesha okukhulu lapho kufundwa.

Amazwana: Ukusetshenziswa kwamandla kwenkumbulo eningi kuzoba kukhulu ngaphezu kwezikhathi eziyi-100 lapho ukukhethwa kwe-chip kusebenza (kungakhathalekile ukuthi i-OE ne-WE) kunalapho ukukhetha kwe-chip kungenjalo, ngakho-ke i-CS kufanele isetshenziselwe ukulawula i-chip noma nini lapho kungenzeka khona nobubanzi be-chip i-pulse yokukhetha kufanele yehliswe ngangokunokwenzeka uma ezinye izidingo zihlangatshezwa.

Inganekwane 7: Ngabe lezi zimpawu zisheshe kanjani? Uma nje kungumdlalo omuhle, ungasuswa

Amazwana: Ngaphezu kwezimpawu ezithile ezithile (njenge-100BASE-T, i-CML), zigcwele ngokweqile, inqobo nje uma ingeyona enkulu kakhulu, akudingeki ukuthi ifane, noma ngabe umdlalo awulona umdlalo omuhle kakhulu. Njengoba ukukhishwa kwe-TTL impedance ingaphansi kwama-ohms angama-50, noma i-20 ohm, uma kumdlalo omkhulu kangaka ukumelana kwabo, i-current inkulu kakhulu, ukusetshenziswa kwamandla akwamukeleki, futhi i-signal amplitude izobe incane kakhulu ukuthi ingasetshenziswa, yisho isilinganiso sokukhishwa ukukhishwa kwamazinga kagesi aphezulu kanye nokukhipha okuphansi kukagesi ngezikhathi ezijwayelekile akufani, futhi akuhambisani ncamashi. Ngakho-ke, ukufaniswa kwe-TTL, i-LVDS, i-422 namanye amasiginali kungamukelwa inqobo nje uma kufinyelelwa kuma-overshoot.

Inganekwane 8: Ukunciphisa ukusetshenziswa kwamandla kuyindaba yabasebenzi behadiwe, futhi isoftware ayihlanganise lutho.

Beka amazwana ku: I-Hardware iyisiteji nje, kepha umbukiso yisoftware, cishe yonke i-chip ekufinyeleleni kwebhasi, yonke i-flip yesiginali icishe ilawulwe yi-software. Uma isoftware inganciphisa izikhathi zokungena kwememori yangaphandle (ukusetshenziswa okuningi kokuguquguqukayo kwerejista, ukusetshenziswa okuningi kwe-CACHE yangaphakathi, njll.), Ukuphendula ngesikhathi esifanele kokuphazanyiswa (ukuphazamiseka kuvamise ukuba sezingeni eliphansi elisebenza kahle ngokumelana nokudonsa) nezinye izindlela ezithile amabhodi athile azokwenza iminikelo emikhulu ekunciphiseni ukusetshenziswa kwamandla