looking for an embedded linux hw.

[Udi Finkelstein]

If you want to simply add a high-speed connection, you may be better off
with an FTDI chip attached to the USB connection.
I don't know how fast the FT232RL is, but the FT232H has a parallel
interface that is certainly fast enough to get all the USB2 bandwidth.

http://www.ftdichip.com/FTProducts.htm

For prototyping:

FR232RL chip - $3 including shipping
http://www.ebay.com/itm/IC-FT232RL-FTDI-SSOP-28-/260810572949?pt=LH_DefaultDomain_0&hash=item3cb9858495

FT232RL based complete module - $10 incl. shipping
http://www.ebay.com/itm/Arduino-FT232RL-USB-6Pin-Serial-Port-Download-Cable-/180720938343?pt=LH_DefaultDomain_0&hash=item2a13cead67

FT232H eval module ($20 not including shipping)
http://parts.digikey.com/1/parts/2398630-mod-usb-hs-ft232h-eval-um232h.html

Udi


2011/10/5 Erez D <erez0001 at gmail.com>

>
>
> On Wed, Oct 5, 2011 at 11:14 AM, Shachar Shemesh <shachar at shemesh.biz>wrote:
>
>>  On 10/05/2011 10:28 AM, Erez D wrote:
>>
>>
>>
>> The serial baud rates are derived from a clock, which is divided by a
>> divider (and then usually divided again by 4).
>> you can set the baud rate to any tandard one (if supported by hardware).
>> however you can simply supply the divide_by value (if hardware supports
>> that, not all hw does, many usb-serial e.g. pl2303 based , does not support
>> that).
>>
>> I'm not sure what SoC the Sheeva is using, but doesn't it have external
>> memory access pins you can hook your FPGA to? Wouldn't that be much faster
>> than anything a UART will provide (and not be considerably more difficult to
>> implement in FPGA)?
>>
> it uses a marvel SOC (afaik sheevaplug is a marvel refernce design).
> actually i wanted more of a streaming connection then a mem-map one, but
> connecting directly to the dram interface could be a nice idea.
> this would involve creating a dram interface on the fpga, and connecting to
> the dram bus. this would also lessen the amount of dram i can have.
> I guess currently i would stick with the uart solution. if it would be too
> slow, and i would have my own board (currnetly i am using the dockstar), i
> would really consider using the dram interface.
>
> thanks for the nice idea
> erez.
>
>
>> Shachar
>>
>>
>> --
>> Shachar Shemesh
>> Lingnu Open Source Consulting Ltd.http://www.lingnu.com
>>
>>
>
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