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 <erez0...@gmail.com> > > > On Wed, Oct 5, 2011 at 11:14 AM, Shachar Shemesh <shac...@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 >> >> > > _______________________________________________ > Linux-il mailing list > Linux-il@cs.huji.ac.il > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > >
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