hw stepper card, linuxcnc, top view?!

arhi wrote: perfect, many thanks for confirming ... so I can have 1 THz stepping if I want (can execute on the hw step generator) and I communicate to step generator ever "servo period"

In principle, yes. However it probably doesn't make sense to have more than a few orders of magnitude difference between step rate and update rate.

(Also, you will probably find it hard to make and program your own FPGA more cost-effectively than just buying a Mesa card, the cheapest one is $59 and the price drops quickly with volume.)

andypugh wrote: In principle, yes. However it probably doesn't make sense to have more than a few orders of magnitude difference between step rate and update rate.

of course, yes .. just testing the logic nothing else ..

andypugh wrote: (Also, you will probably find it hard to make and program your own FPGA more cost-effectively than just buying a Mesa card, the cheapest one is $59 and the price drops quickly with volume.)

I don't have a problem to program fpga I just have problem I don't have time to spend with my kid let alone invent hot water so of course I'm getting a ready/tested product ... I'm more interested in this as an idea then as something I'd implement ... attm my puny machine runs more then ok from a parallel port ... I'll get mesa card just for future updates ... the 2 daughters with a pci-e card solves kinda all my current and future neads + I was looking at these mesa links you gave me, I could use these cards for some other stuff ... but that's another story .. Thanks!