[Arm-netbook] GR8 based EOMA68 card
zapper at openmailbox.org
Thu May 11 01:16:06 BST 2017
On 05/10/2017 08:05 PM, Ismo Väänänen wrote:
> 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:
> 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
> 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
> 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
Good luck to you sir!
> Ismo Väänänen de OH2FTG alias 2ftg
> arm-netbook mailing list arm-netbook at lists.phcomp.co.uk
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