On Sat, 10 Nov 2007, Jon Elson wrote: > Date: Sat, 10 Nov 2007 00:12:54 -0600 > From: Jon Elson <[EMAIL PROTECTED]> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Low Cost Motion Contorl Card? > > Peter C. Wallace wrote: >> On Fri, 9 Nov 2007, Jon Elson wrote: >> >> >>> Date: Fri, 09 Nov 2007 20:36:30 -0600 >>> From: Jon Elson <[EMAIL PROTECTED]> >>> Reply-To: "Enhanced Machine Controller (EMC)" >>> <emc-users@lists.sourceforge.net> >>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >>> Subject: Re: [Emc-users] Low Cost Motion Contorl Card? >>> >>> Peter C. Wallace wrote: >>> >>>> >>>> Besides I dont think parallel port cards are going away any time soon, I >>>> just >>>> saw a just released PCI-express - Serial/parallel/localbus chip... >>> >>> How much was that PCI-E card? I may have to get a system with >>> PCI-E and use a parallel card in it to explore the implications >>> of serializing the communications. >>> >>> Thanks for the news flash! >>> >>> Jon >> >> >> >> This was just the chip (MOSCHIP MCS9901), but cards should not be too far >> behind. I was interested as it can also be used as a cheap PCI-E to 8 bit >> local bus (ISA) bridge and the serial ports go up to 16 MBaud... > Hmmmm, 16 MBits/sec? Gee, I could send a 16-byte packet, with > start and stop bits, in 10 us! And, UARTs are full-duplex. I > was thinking "what a pity it doesn't have SYN recognition", but > it is ASYNC, so it doesn't need them. Most likely has > 16450-style FIFOs, too, and 16 bytes, I'll bet. So, you can > collect all 16 bytes of the packet in one burst. Definitely an > interesting alternative, but the parallel port OUGHT to work > right out of the box with no software changes (I hope). > > Thanks, > > Jon
The unknown is the read and write overhead from the PCI-E bus, though I doubt it will be any worse than a PCI parallel port. The UARTs are indeed 16550 type with 256 byte receive and trasnmit FIFOs The fact that the parallel port connects via PCI-E should be transparent. Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users