Hi

I'm building a 8052 based control system for a large power converter, where MOSFETs need to be turned very on for very accurate short lengths of time. The calculation requires the value of COSINE to determined with a resolution of upto 0.0001 degree at upto 30,000 Hz. I have looked at using an algorithm to do this in real time, (Goertzal, CORDIC, trigonomic identity), but none is able to perform at the high speed and accuracy that I require, since 32bit division and multiplication is so lengthy.

My solution to this is use an external lookup table to store precalculated data at 32bit resolution. Since my controller( i plan to use the new Cygnal microcontroller for it's speed) has 32 IO pins, a standard 4mb eeprom would use most of the available IO pins, leaving no spare pins for display and control lines.

The only solution I can see working would be to use a Toshiba SMARTMEDIA Nand flash memory, since it requires only 8 io pins along with 5 control lines.

I dont any experience using external memory, my applications up until now have been modest, but any advice on this matter would be greatly appreciated.

Konrad