... > Buses are changing from mostly parallel to serial. PCI is going that way > and USB3.x is very promising. It's direction most computer vendors are > taking. Simplifies cabling over longer distances if nothing else.
I went to school (computer engineering) in the late 70's' and early 80's back then parallel was always faster. When serial busses started outperforming parallel wires I was puzzled for a while then read up some. The reason for serial being faster is easy, There is no chance of "bit skew" with serial. Bit Skew is when you have a parallel cable and some bits travel "faster" because not all conductors in the cable are equal. Your max speed is limited by worst possible case skew. Serial can run a gigahertz speeds for kilometers if need be. A flexible parallel cable would never run that fast. (But notice there ARE some multi channel serial cables) At any rate this is the way the computer world is going you to NOT design a card that pugs into a parallel buss like the old PCs have. You now connect you device with a high speed serial cable. Not need to have a standard form factor. I'd say that a modern CNC controller would connect to the computer with either Ethernet or USB. non-real time code would flow over the serial cable -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
