Kenneth Lerman wrote: > Hey Peter, > > You don't happen to have an ethernet interface IFDEFed out there too, do > you? > > Ken
As Peter pointed out, it isn't the FPGA that is the limiting factor, it is the computer interface. The reason the parallel port (in EPP mode) works for connecting to external devices is that the parallel port is simple and well defined and the SAME in just about every PC. (Even so, EPP version 1.7 vs EPP version 1.9 has caused some grief.) Ethernet on the other hand has about a thousand different chips that can be used on network cards. The vast army of Linux programmers has written a thousand network drivers, so our PCs can connect to the world using Ethernet. But those Linux drivers are not realtime capable. For EMC to support Ethernet, we need realtime drivers. There are some out there, associated with a project called RTNet, but so far nobody is motivated enough to figure out how to use them. The same thing goes for USB, only about 10x worse. Personally, I'll stick with Parport EPP for low cost, and PCI for performance. Both are extremely generic and don't need special drivers for realtime. Regards, John Kasunich ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
