Tim> Since we can't count on the user's UART being fast... why not ship Tim> our own? Most inexpensive USB to Serial adapters claim they can do > Tim> 1Mbps. Roughly 128k/s, or 34 minutes for a full 256Mb ram dump. We Tim> get the simplicity of serial on the FPGA-side, the compatibility and Tim> speed of USB on the PC side. And all for $5 - $15. Tim> Tim> See: http://www.newegg.com/Product/Product.asp?Item=N82E16812189123
$7.99 + $4.99 shipping http://www.link-depot.com/USB-DB9.htm Question is, what chip does this one use? We need device driver support for the various OSes. I'm told that increasing the speed of a UART is just a matter of using a faster crystal. So any RS-232 port that we can change the crystal on should work. USB has its problems, but one advantage to a USB-to-RS232 is that we can make the rs232 cable very very short. Wire the OGD as a DCE and plug it in directly, no rs232 cable at all. ------------------------------- Timothy> I want to make sure we can identify that this serial Timothy> device is the one associated with our board, as opposed to some random Timothy> serial device. This just makes it easier for our tracer software to Timothy> figure out which serial device it wants to talk to. Figure out what /dev entry it is manually, then ln -s /dev/tty037 /ogd_pci_analyzer/control_port and have the software use /ogd_pci_analyzer/control_port ------------------------------- Timothy> I'm inspired by the Itanium instruction set. Timothy> the effect will be that we report that a signal changed 2.5ns Timothy> later than it actually did. Yep, getting incorrect answers sounds like something inspired by Intel. :-( Itanium is especially bad. ------------------------------- Timothy> Yeah. Excepting the case of a 64-bit PCI bus (which we could Timothy> support), we have fewer than 64 signals to track. I thought you were debugging a 64-bit PCI bus? ------------------------------- Daniel> It's a Microsoft spec Isn't that enough of a warning? _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
