On Friday 20 November 2009, Chris Knowlton wrote: >OK, I found the data sheets on the chip and I also found a couple of app >notes, which helped a bit, now I need some translation of the EMC tags >please > >Step Time: I assume this means the pulse width from rising edge to falling >edge?
Or better, from falling edge to rising edge, there is more giddy up on a logic zero than in a logic one, so a logic zero is generally considered the active state. >Step Space: I assume this is the smallest spacing between pulses that >should be sent? Something like that, and usually that is a lot faster than emc can send them anyway. >Direction Hold: I assume that this is the amount of time the direction >signal has to stay high to make the direction change? This one isn't clear to me. >Direction Setup: I have no idea what this is. Time a direction signal must be valid before a step should be sent. Maybe.. There is a possibility that the direction setup signal is latched by the direction hold I suppose and that tells it which direction. But I don't have any of this particular beast so I'm not sure. I'd re-read the docs & maybe even setup a test circuit that just drove small bi-colored led's to see how it actually works. There were some state graphs in the pdf that might help clarify that, a case of a picture being worth many words. ;) I'd print it, that way you have it exactly as they published it. I sure find it easier to grok anyway. [huge snip since you are top posting. Please don't, instead interleave your answers so it all reads in natural order as I tried to do above] -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> Yield to Temptation ... it may not pass your way again. -- Lazarus Long, "Time Enough for Love" ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
