Hardware Block Diagram

BrendaWang brenda_wang at openmoko.com
Fri Jun 6 04:29:47 CEST 2008

Here is the detail spec of GTA02

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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