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Altera_Forum's avatar
Altera_Forum
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14 years ago

Fixed Point Rounding

Hey guys, I have one more question about fixed point rounding. If you multiply two numbers and have to perform rounding, how would you do that with fixed point? I'm currently round...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Personally I always use the following technique. If I want to round 16-bits into 6 - bits I do the following.

XXXX_XXXX_XXXX_XXXX

+ 0000_0010_0000_0000

Then truncate the 6 msb's this will be the rounded value. I would not make it more difficult than that. In essence you are adding 0.5 and then truncating in decimal. It does not matter how many bits you have on the right hand side of the decimal point.

Hope that helped

/Boris