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XMOS xCORE
#42
Pokušao sam postojeću šemu staviti na PCB, ovaj puta na 4-slojnu, što je i moj prvi dizajn na više od 2 sloja. Trebalo mi je malo da shvatim (ili se pomirim) s činjenicom da većina PCB proizvođača pod najjeftinijom izvedbom ovakve PCB dozvoljavaju samo dizajn sa prolazima (vias) koje prolaze kroz sve slojeve (thru-hole). Neki nude blind i buried prolaze/vias, ali tako da spaja dva unutarnja sloja koji bi se inače trebali koristiti za napajanje pa u tome nisam vidio neku prednost. Ograničenje na samo thru-hole prolaze jako troši slobodan prostor na gornjem i donjem sloju tako da stvar oko čipova sa puno pinova (MCU) stvar može biti poprilično nategnuta, posebice jer se u njegovoj blizini očekuje veliki broj decoupling kondenzatora.
Sve mi je uspjelo stati na 85 x 100 mm, što je unutar kineskih limita od 100 x 100 mm za najpovoljniju cijenu. Evo kako izgledaju gornja i donja strana renderirano na OSHparku:

[Image: FianrNR.png]

[Image: XRstRm9.png]

S donje strane sam stavio samo micro SD card konektor (J2) i 20-pinski Riverdi LCD konektor (X5). U drugom sloju koje se ne vidi je GND, a na trećem je +3.3 V i +1 V. Još pomalo dvoumim da li mijenjati funkcionalnost sa šeme ili ne. Isto tako ne znam i dalje jesam li napravio sve što je potrebno da se USB port može koristiti kao host ili device.
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Messages In This Thread
XMOS xCORE - by prasimix - 12-23-2017, 12:07 PM
RE: XMOS xCORE - by mikikg - 12-23-2017, 03:09 PM
RE: XMOS xCORE - by prasimix - 12-23-2017, 04:38 PM
RE: XMOS xCORE - by Macola - 12-23-2017, 10:04 PM
RE: XMOS xCORE - by mikikg - 12-24-2017, 01:07 AM
RE: XMOS xCORE - by prasimix - 12-25-2017, 11:12 AM
RE: XMOS xCORE - by mikikg - 12-24-2017, 03:10 AM
RE: XMOS xCORE - by prasimix - 12-24-2017, 10:32 AM
RE: XMOS xCORE - by mikikg - 12-24-2017, 11:54 AM
RE: XMOS xCORE - by prasimix - 12-24-2017, 04:18 PM
xCORE MCU tipovi - by prasimix - 12-24-2017, 04:20 PM
RE: XMOS xCORE - by mikikg - 12-26-2017, 12:31 AM
RE: XMOS xCORE - by mikikg - 12-26-2017, 01:19 AM
Pin mappings - by prasimix - 12-26-2017, 11:47 AM
RE: XMOS xCORE - by mikikg - 12-26-2017, 12:36 PM
RE: XMOS xCORE - by mikikg - 12-26-2017, 11:54 PM
RE: XMOS xCORE - by mikikg - 12-27-2017, 03:24 AM
RE: XMOS xCORE - by prasimix - 12-27-2017, 12:49 PM
RE: XMOS xCORE - by mikikg - 12-28-2017, 01:31 AM
RE: XMOS xCORE - by prasimix - 12-28-2017, 01:10 PM
RE: XMOS xCORE - by mikikg - 12-28-2017, 05:42 AM
RE: XMOS xCORE - by prasimix - 12-28-2017, 01:18 PM
RE: XMOS xCORE - by gorankg - 12-28-2017, 02:58 PM
RE: XMOS xCORE - by prasimix - 12-28-2017, 03:19 PM
RE: XMOS xCORE - by gorankg - 12-28-2017, 03:56 PM
RE: XMOS xCORE - by prasimix - 12-28-2017, 05:46 PM
xCORE eval. ploča - by prasimix - 01-04-2018, 03:33 PM
RE: XMOS xCORE - by vojinilic - 01-04-2018, 05:42 PM
RE: XMOS xCORE - by prasimix - 01-05-2018, 09:36 AM
RE: XMOS xCORE - by gorankg - 01-04-2018, 06:33 PM
RE: XMOS xCORE - by prasimix - 01-05-2018, 09:53 AM
RE: XMOS xCORE - by gorankg - 01-05-2018, 10:48 AM
RE: XMOS xCORE - by prasimix - 01-05-2018, 11:24 AM
RE: XMOS xCORE - by prasimix - 01-05-2018, 10:10 AM
RE: XMOS xCORE - by vojinilic - 01-05-2018, 04:20 PM
RE: XMOS xCORE - by prasimix - 01-05-2018, 04:59 PM
RE: XMOS xCORE - by vojinilic - 01-05-2018, 06:40 PM
RE: XMOS xCORE - by prasimix - 01-05-2018, 06:45 PM
RE: XMOS xCORE - by gorankg - 01-05-2018, 06:06 PM
RE: XMOS xCORE - by vojinilic - 01-05-2018, 07:06 PM
RE: XMOS xCORE - by prasimix - 01-09-2018, 12:33 PM
RE: XMOS xCORE - by gorankg - 02-06-2018, 10:19 PM
RE: XMOS xCORE - by prasimix - 02-06-2018, 11:02 PM
RE: XMOS xCORE - by prasimix - 02-17-2018, 11:55 AM

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