[Arm-netbook] GR8 based EOMA68 card

[CNX Software]

Wouldn't the PCMCIA card thickness be an issue when using a CPU module?


On 05/11/2017 07:05 AM, 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.
>
> Cheers,
> Ismo Väänänen de OH2FTG alias 2ftg
>
>
>
>
>
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