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Altera_Forum
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14 years ago

Arithmetics in VHDL

Hi, I need to implement some arithmetic functions in an FPGA (which I never done before) and I have a few questions. I'm currently using a Cyclone IV E dev kit, the actual design will use either C...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

My suggestion is to use the Cordic algorithm coded in VHDL. The Cordic in rotation mode will give you sin(theta) and cos(theta), where you supply the theta. You can then use the Cordic algorithm in vectoring mode to get atan(y/x) and sqrt(x^2 + y^2), which is magnitude. With regards to the power function, I would suggest expansion in a Taylor series and then simply using the large amounts of embedded multipliers in Cyclone IV and up devices to do the multiplication and addition. -James