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Altera_Forum
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15 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
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15 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.