<div dir="ltr"><br><br><div class="gmail_quote">On Wed, Oct 5, 2011 at 3:49 PM, Udi Finkelstein <span dir="ltr"><<a href="mailto:Linux-IL@udif.com">Linux-IL@udif.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div dir="ltr">If you want to simply add a high-speed connection, you may be better off with an FTDI chip attached to the USB connection.<br>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.<br>
<br></div></blockquote><div>Thanks,<br>That may be a good option.<br><br>btw,<br>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.<br>
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.<br>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.<br>
<br>however it is tempting ...<br><br><br>anyway, for other uses, i love this chip. solves me the headache of how to connect simple hardware to be controlled by a pc.<br>I will surely use it in other applications.<br></div>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div dir="ltr"><a href="http://www.ftdichip.com/FTProducts.htm" target="_blank">http://www.ftdichip.com/FTProducts.htm</a><br>
<br>For prototyping:<br><br>FR232RL chip - $3 including shipping<br><a href="http://www.ebay.com/itm/IC-FT232RL-FTDI-SSOP-28-/260810572949?pt=LH_DefaultDomain_0&hash=item3cb9858495" target="_blank">http://www.ebay.com/itm/IC-FT232RL-FTDI-SSOP-28-/260810572949?pt=LH_DefaultDomain_0&hash=item3cb9858495</a><br>
<br>FT232RL based complete module - $10 incl. shipping<br><a href="http://www.ebay.com/itm/Arduino-FT232RL-USB-6Pin-Serial-Port-Download-Cable-/180720938343?pt=LH_DefaultDomain_0&hash=item2a13cead67" target="_blank">http://www.ebay.com/itm/Arduino-FT232RL-USB-6Pin-Serial-Port-Download-Cable-/180720938343?pt=LH_DefaultDomain_0&hash=item2a13cead67</a> <br>
<br>FT232H eval module ($20 not including shipping)<br><a href="http://parts.digikey.com/1/parts/2398630-mod-usb-hs-ft232h-eval-um232h.html" target="_blank">http://parts.digikey.com/1/parts/2398630-mod-usb-hs-ft232h-eval-um232h.html</a><br>
<br>Udi<br><br></div></blockquote><div>thanks for the thorough work. <br><br>erez.<br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div dir="ltr"><br><div class="gmail_quote">2011/10/5 Erez D <span dir="ltr"><<a href="mailto:erez0001@gmail.com" target="_blank">erez0001@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div dir="ltr"><br><br><div class="gmail_quote"><div>On Wed, Oct 5, 2011 at 11:14 AM, Shachar Shemesh <span dir="ltr"><<a href="mailto:shachar@shemesh.biz" target="_blank">shachar@shemesh.biz</a>></span> wrote:<br>
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On 10/05/2011 10:28 AM, Erez D wrote:
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<div dir="ltr"><br>
<div class="gmail_quote"><br>
<div>The serial baud rates are derived from a clock, which is
divided by a divider (and then usually divided again by 4).<br>
you can set the baud rate to any tandard one (if supported
by hardware).<br>
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).<br>
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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)?<br></div></blockquote></div><div>it uses a marvel SOC (afaik sheevaplug is a marvel refernce design).<br>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.<br>
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.<br>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.<br>
<br>thanks for the nice idea<br><font color="#888888">erez.<br><br></font></div><div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000">
<font color="#888888">
<br>
Shachar</font><div><br>
<br>
<pre cols="72">--
Shachar Shemesh
Lingnu Open Source Consulting Ltd.
<a href="http://www.lingnu.com" target="_blank">http://www.lingnu.com</a>
</pre>
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