[time-nuts] Controlling FEI 5680A

Chris Albertson albertson.chris at gmail.com
Sat Jan 14 23:48:51 EST 2012

On Sat, Jan 14, 2012 at 4:32 AM,  <EWKehren at aol.com> wrote:
> I have no expertise when it comes to filter design or programming PIC's or
> other micro controllers. But I know what works for me. For 11 years I have
> been  using Shera controllers with very good results. (I still have some new
> assembled  extra A&A boards, if any one is interested, please contact me
> off list) Over  the years I have made hardware work around's and made my own
> boards ending up  with 120 and 240 samples and 100 MHz clock in stead of 24
> MHz. Over time chips  are harder to get. The solution is an Altera MAX 3000
> gate array and that input  circuit can be implemented on a $ 2  100 MHz
> version or $ 5   200  MHz version using either a 100 MHz or 200 MHz clock. That
> circuit works with the  present Shera PIC but that is a 28 pin $ 4   device.
> Since in  this application the controller does not have  to be all things
> for all  devices it would make sense to use a PIC16F688  or any other 14 pin
> device.

Have you thought about putting the PIC  _INSIDE_ the Altera FPGA?

It's a common trick to implement a microcontroller in the FPGA and you
can get the code for just about any CPU core online.  Here is an
example of "virtual PIC":
If the PIC fits inside then that is one less chip on the PCB.   The
example above found that could run the virtual PIC a little faster
than a real pic so you don't give up any performance


Chris Albertson
Redondo Beach, California

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