[Arm-netbook] EOMA68-A20 interface redesign

[joem]

On Sat, 2014-05-31 at 14:39 +0100, Luke Kenneth Casson Leighton wrote:
> On Sat, May 31, 2014 at 1:17 PM, joem <joem at martindale-electric.co.uk> wrote:
> > On Fri, 2014-05-30 at 21:39 +0100, Luke Kenneth Casson Leighton wrote:
> >> On Fri, May 30, 2014 at 9:13 PM, Boris Barbour <barbour at biologie.ens.fr> wrote:
> >> >
> >> > On 30/05/14 21:04, Luke Kenneth Casson Leighton wrote:
> >> >>
> >> >> so i*think*  we can go to 2gbyte of RAM.
> >> >
> >> >
> >> > Good news! It could be a reasonably capable machine.
> >>
> >>  yeah.  now we have to test it, at least creating a batch of minimum 5
> >> CPU Cards.  just to be on the safe side, probably make 3 with 2Gbyte
> >> RAM and 2 with 1 Gbyte RAM.  i'm guessing we will need somewhere
> >> around $1.5k for 5 boards including components.
> >>
> >>  joe if i get you the modified pcb layout can you handle getting this
> >> sorted (PCB printed, populated etc.)?
> >
> > No problem, but remember, as company we still need the SATA.
> 
>  aw f**** :)
> 
> > It would be good if you can put in some wings that
> > can be broken off that has SATA and a lot more IO coming out
> > of FPC. The wings should be at the HDMI end
> 
>  there isn't enough space to do that....
> 
>  ohhh waaait, i got one.  there is *just* enough room to put an FPC20
> underneath the MicroSD.  4 pins SATA.
> 
>  i should just about be able to route the TS/CS group 0 (pin group
> PE0-PE11) through to it via a couple of routes.
> 
>  that's 16 pins... actually if i make it TS/CS group 1 (pin group
> PG0-PG11) that would also give multiplex access to SD1 as well.
> 
>  2 GND... 18... 1 5V 1 3.3V that's 20.
> 
>  .... that good enough?

One 20 pin FPC at the microSD end of the EOMA with SATA 
and more IO pins ought to enough for anyone (TM).

Alternatively a SATA, a second USB in exchange for reduced IO pins
ought to be enough for anyone else (TM).

The GND, 5V, 3.3V essential.