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Altera_Forum
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15 years ago

Dividing two N-bit signed binary (with fractional bits) in Quartus

In my design, I am required to divide a signed 16-bit binary, say A, with another signed 16-bit binary, say d. Both inputs have decimal and fractional bits. The denominator d is actually a posi...
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Altera_Forum
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15 years ago

You are on right track. you only need to scale 1/d by some power of 2 then truncate final result equally. e.g. .999 = .999 x 2^14/2^14

hence scale .999 to = .999 * 2^14 = 16368

In hardware truncate off 14 LSBs thus you get .999 in effect

The real issue is how to get 1/d from d if not constant(may be lut...)