Odp: [sdiy] Getting back to my Midi->CV converter...

[patchell]

    The schematic is going to get a bit bigger still...I decided that besides
the DMA access, I need to add a way for the CPU to directly access the S/H's
as well, to cure the latency problem.  This shouldn't take much more logic.



Roman wrote:

> one way to prevent designs from being stolen/copied is to
> make them BIG ;)
> I really enjoy viewing your schematics Jim.
>
> as for DMA for multiple S&Hs, I made something remotely similar.
> There's small RAM (6116) with counters, that writes the DAC
> and controlls S&H's MUX. Whenever CV is to be changed,
> processor writes to this RAM, so it only cares about changes,
> leaving the hardwork for the hardware (as "hardw-" prefix
> would suggest).
>
> now, the truth is, the PCBs were only made and I didn't find
> the time to solder them in 4 years :-P
>
> Roman
>
> ----- Original Message -----
> From: patchell <patchell at silcom.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Friday, October 11, 2002 6:46 AM
> Subject: [sdiy] Getting back to my Midi->CV converter...
>
> >     http://www.silcom.com/~patchell/miditocv/miditocv.html
> >
> >     I noticed I originally posted that page about 4 years ago...my how
> > time flies.
> >
> >     The web page gives a very brief description of what I plan on doing,
> > plus, I posted a schematic of the FPGA I just got to compile that is
> > going to do the DMA services for updating the sample/holds...yep, I said
> > DMA...just call me crazy Jim...it has been a while since I did a DMA
> > (about 15 years), so I decided to so this to get my feet wet again
> > before tackling the nasty one I am going to start at work.
> >
> > --
> >  -Jim
> > ------------------------------------------------
> > * Visit:http://www.silcom.com/~patchell/
> > *-----------------------------------------------
> > *I'm sure glad Merry Christmas comes just once a year
> > * -Yogi Yorgensen
> > ------------------------------------------------
> >
> >

--
 -Jim
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* Visit:http://www.silcom.com/~patchell/
*-----------------------------------------------
*I'm sure glad Merry Christmas comes just once a year
* -Yogi Yorgensen
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