On Sat, Jan 14, 2012 at 4:32 AM, <[email protected]> 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": http://www.embeddedtronics.com/pic_core.html 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
