Daniel Phillips wrote: >On Tuesday 05 April 2005 16:52, Timothy Miller wrote: > > >>Um... I'm really hesitant to do that. We did a parts cost estimate, >>but I can't remember the number off hand, although I think it was >>over $300. Note that this board would include a good number of >>"debug" features, since that's its primary purpose, and that >>increases cost. However, whatever it is, we have to price it >>appropriately for development and overhead. Naturally, we don't >>expect to sustain the business on it, but it does need to be >>profitable. >> >> > >I'm torn between wanting all the trimmings and wanting the price below >$200, for the _prototype_ board. Can we have a list of costly debug >features we can kick around? I know there are bits and pieces of >debate on this back there in the archives, but that's a long way back. > >I don't think we should lose sight of "light and tight" even for the >prototype board. > >I personally would not mind having to fall back to loading the fpga via >jtag if the pci logic gets accidently destroyed, and thus be able to >put the pci login on the fpga as originally planned. Does this save >anything significant? > >I sure do not want blinking lights, led displays and that sort of thing. > >Regards, > >Daniel > It sure would be nice if it cost be the lowest possible. And the fact that the PCI interface will be in a CPLD have some draw back for the cost, the opportunity to code a pci interface and transmission delay between the CPLD and FPGA. It do have the advantage for the pci bus that the device doesn't dissaspear suddently and if the programation fail your still able to upload new code. That said, the fact the product is going to asic the FPGA card not having the CPLD would not be a great dissavantage since most of the people buying the prototype card would have or be able to build a JTAG cable www.*xilinx*.com/support/programr/*jtag*_*cable*.pdf
For the debugging feature as I see it there's only some necessary : a lot of header for signal test point something like two 40 pins headers and the jtag header. For the last part, sorry to dissapoint you Daniel ;), but I like my board to have at less 2 led, one to signal when programing and one for a visual watchdog. Andr� _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
