Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

NIOS2 HW & DIV Instructions + FPU

Hello i am in charge of designing a system that does a lot of complex sin/cos/* instructions and i need them to be fast. I am using NIOS2-F at 100mhz in a Cyclone IV. I've enabled HW and DIV ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Depending on what you are doing you might be able to reduce the amount of maths required!

If you only need limited precision use a lookup table and linear interpolation (and maybe a single newton-raphson step).

If you are generating values in sequence (eg tone generation) then use the equality: sin(a+b) = 2sin(a)cos(b) - sin(a-b)

Use fixed-point maths (in integers) rather than floating point.