On 6/24/2014 9:46 AM, 吳政昌 wrote: > > * hostmot2 VHDL code > I have't heard of hostmot2 before. Thank you for mentioning it. From > linuxcnc's document the 7i43 supports 8-channel servo or 4-channel servo > plus 4 step/dir generator. I'm not that ambitious. I have had only 4 > step/dir generators in my mind when I started to design the board. I'm > planning to write the step/dir generators from scratch and connected it to > a j1 Forth CPU. Maybe I should go for a iCE40HX8K so there is more room for > VHDL.
The iCE40 ought to be big enough to do step/dir generation, it just probably isn't big enough to run the existing hostmot2 code. I'd personally love to see a small Forth engine in an FPGA for motion control, I think it would work very well. I just wasn't sure how much you were going to be designing. If you're not trying to squeeze in the hostmot2 code, you ought to be able to do quite a bit even in the smaller iCE40 parts. 3,520 flip-flops can handle quite a few step/dir generators if you're careful with the design, and the j1 CPU is about as small as you can get. :) Very exciting! Keep us posted on your progress! -- Charles Steinkuehler [email protected]
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