Re: [jornada] Flashboard for a 720

That USB host chip may physically be too large. :(

And, yes, I was planning on 64-128Megs flash and 64-128Megs RAM (I'm hoping the newer technology chips are denser that their earlier counterparts).

If you do a chip swap on a board, your biggest problem is going to be putting the initial bits into the flash memory. Plus, if you put the bits in before soldering the chips down and if anything goes wrong, you're gonna have a REALLY hard time trying to figure out what.

The plan I wanted to use was to assemble the boards, then use the Jornada's JTAG interface to do the initial programming, but, as of yet, I've not heard of anyone actually identifying the JTAG pinouts on the J720/8 mainboard.

So, the plan I'm now executing is still to assemble the boards and then program them, but I will be using a USB-connected PIC to do the inital programming instead. However, dropping JTAG and adding the PIC has complicated the design.

As to price, it is still too early to tell. I'm hoping the absolute most they will be is US$100, but since this is going to be low-quantity work (20 maybe 25 boards + 5 more for me to short out while testing... ;)), I really don't yet know. The memory and flash parts are pretty cheap nowadays....

Regards,
-MarkG

Filip Zyzniewski wrote ..
> Dnia 23-06-2006, pi± o godzinie 14:29 -0400, Mark Gollahon napisa³(a):
>
> > Hehe, I'm still working on it.... Does anyone know of a good ohci or
> uhci usb host chip that I could put on the flashboard? Depending on its
> size, I might be able to get that on there as well....
>
> Huh, I had the same idea :)
>
> There is one...
>
> It can be easily (so they say) connected to various buses, EVEN LPT!
> It has a linux driver.
>
> It's a Cypress SL811HS.
>
> It would ROCK to have it inside :D
>
> They use it in this:
> http://www.ratocsystems.com/english/products/subpages/cfu1u.html
>
>
> Documentation:
> http://www.cypress.com/publishedcontent/publish/design_resources/datasheets/contents/sl811hs_8.pdf
>
>
> I thought about removing the modem (no driver for it anyway, and no use
> for modem for me because I'm going to use UMTS) and putting sl811hs,
> it's companions and usb socket there.
>
>
>
> Do you plan to include a megabyte range flash space on this board? Or
> just place for a simple bootloader?
>
> What would be the estimated cost of this board?
>
> How about... 128MB or more RAM :)? We could use chips from old
> PC100/PC133 DIMMs (the original rom board samsungs k4s281632b were used
> on DIMMS too ;)).
>
> What do you think about the idea of replacing mx23l6430 with flash on
> original one? I am buying rom board solely for this purpose right now...
>
>
> bye,
> Filip Zyzniewski
>
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Received on Fri Jun 23 2006 - 15:15:03 EDT