<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><a href="http://www.ftdichip.com/FTProducts.htm">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">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">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">http://parts.digikey.com/1/parts/2398630-mod-usb-hs-ft232h-eval-um232h.html</a><br>
<br>Udi<br><br><br><div class="gmail_quote">2011/10/5 Erez D <span dir="ltr"><<a href="mailto:erez0001@gmail.com">erez0001@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div dir="ltr"><br><br><div class="gmail_quote"><div class="im">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>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 class="im"><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">
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<br>
Shachar</font><div><br>
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<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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