looking for an embedded linux hw.

[Erez D]

On Wed, Oct 5, 2011 at 3:49 PM, Udi Finkelstein <Linux-IL at udif.com> wrote:

> 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.
>
> Thanks,
That may be a good option.

btw,
I had some bad experiance with usb relibility.It could have been bacause of
the ubuntu linux kernel driver, or because of the hub, but after some time
the usb devices were unresponsive and i had to disconnect-reconnect to make
them work again.
I tried different OS (centos) + different hub. it fixed the problem, so i
guess a certain system (ubuntu specific version) had a problem with a
specific hub.
still i do not know what kernet version i am running on the target, and how
stable it is with the specific chip. and because i want MTBF of months or
even years, i am not sure this is the best solution.

however it is tempting ...


anyway, for other uses, i love this chip. solves me the headache of how to
connect simple hardware to be controlled by a pc.
I will surely use it in other applications.

> 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
>
> thanks for the thorough work.

erez.

>
> 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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>>
>>
>
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