On 05/10/2017 08:05 PM, Ismo Väänänen wrote: > Hello, > > The recent talk about de-blobbing R8 and thus also GR8 inspired me to > do a quick write up on how I see a Next Thing Co. GR8 > System-In-Package chip being used in an EOMA68 compatible card. > The latest version of the write up can be found here: > https://sites.google.com/site/oh2ftg/eoma68/eoma68-gr8 > > I named the project "EOMA68-GR8" because why not. > > Like Vincent I'm doing this on the side and also with Altium. > I haven't done anything this complex in Altium before it's likely > going to be an interesting challenge. > > GR8 has TTL/RGB LCD interface, USB2.0, I2C, SPI(SDMMC) and so on. > All the interfaces to make a compute card compatible with EOMA68 are > there. > Except if I want the card to have "front facing" USB I'll need to > include some USB HUB chip like TI TUSB2046, which conveniently has no > firmware being a state machine. > > I'll have to look at how the interrupts go, at AXP209 PMIC and it's > routing. > And decide on if I'll layout the NAND as the talk about blobs being > required for NAND support sounds worrying. That and seeing in general > if even a half reasonable layout is possible on 4-layer FR4 to get > cheaper rates on the pcb's. At least there's no DDR RAM to route, but > the TTL/RGB fanout and length matching is gona be chore. > One more good reason to learn how the automated length matching in > Altium works. > > Sourcing connectors and housings in small quantities. All that fun stuff. > > If anything I have missed comes to mind please mention it, I'd rather > hear it now then when I have prototype pcb's at hand or layout nearly > done. >
Good luck to you sir! > Cheers, > Ismo Väänänen de OH2FTG alias 2ftg > > > > > > _______________________________________________ > arm-netbook mailing list [email protected] > http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook > Send large attachments to [email protected]
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