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Altera_Forum
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15 years ago

How to choose device : CPLD or FPGA ?

I want to implement a polynomial function to continuously process a digital temperature signal and output a variable based on such evaluation. What device to look out for ? CPLD or FPGA ? How ca...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

it wont be as simple as 43 adders

if x is 8 bits, x^2 will need 16 bits, and x^3 needs 24. Then if A,B,C,D are 8 bits again, the output is going to be 32 bits.

So thats a lot of adders. Different devices have different size LEs - some have 4input LUTs, some have 6. So to estimate the number of LEs required its simpler just to write the code and compile it.