Hardware Block Diagram
BrendaWang
brenda_wang at openmoko.com
Fri Jun 6 04:29:47 CEST 2008
Here is the detail spec of GTA02
http://wiki.openmoko.org/wiki/Neo_FreeRunner_GTA02_Hardware
Dale Schumacher 提到:
>
> I've done several searches on the wiki and I can't seem to find any
> block diagram of the Freerunner hardware. Is there any such thing? It
> would sure help to clarify how all this stuff is connected.
>
>
> ---------- Forwarded message ----------
> From: Andy Green <andy at openmoko.com <mailto:andy at openmoko.com>>
> Date: Thu, 05 Jun 2008 09:29:36 +0100
> Subject: Re: Yummy new CPU/GPU combo
>
> ...
>
> We would rightly deserve to get our asses laughed at if we did that.
> You're likely thinking about the actual SD Card interface is now
> via the
> Glamo, which has an SD interface poking out of it. WIFI is hooked to
> the CPU SDIO bus and we don't otherwise use these buses.
>
> | If it's connected to the address/data bus, why is it so slow and
> why can't
> | DMA be used to copy data to it?
>
> DMA can be used, I seem to recall someone saying they did
> something with
> it in Xglamo, but PIO isn't where the problems are coming from.
>
> The Glamo offers normal async memory bus interface which we use,
> but it
> has a bunch of timing constraints. (There is a synchronous burst bus
> mode that we don't use because the CPU doesn't support it and adding a
> CPLD in there to translate will eat power and doesn't make sense.)
>
>
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