fixed-point tips

Oops, apologies... VHDL.

I've made a little progress. I've written a little function that multiplies two 16 bit unsigned integers, which results in a 32-bit unsigned integer. The function then just drops the 16 LSBs which results in the scaled answer. So this works fine for unsigned inputs whose 'real' value is =< 1. I don't know how general this is for values > 1... probably not. For signed values I suppose just a little extra logic is needed to test the sign bit and derive the appropriate sign bit for the result.

The next element I need to figure out is the division part. Assuming (A1*A2) (the divisor) is not a tidy factor of 2 then would inverting then multiplying work. Is there a simple approximation for 1/x using a Taylor expansion or some other simple way? I don't think it has to be too accurate.

Thanks in advance for any pointers, Kurt