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Altera_Forum's avatar
Altera_Forum
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14 years ago

sfixed to ufixed conversition

Hi all; I have learn about ufixed and sfixed operation. I want to convert -0.129 to sfixed using the code below and its has no problem; signal n1: ufixed (4 downto -4); ... out_A <= ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

you've got the sizing wrong.

(5 downto -4) * (5 downto -4) would give you a (11 downto -8) result.

out_A(i) is (9 downto -10), so it doesnt fit properly. BUT there are the correct number of bits, so you effectivly just divided the result by 4.

Secondly - you cannot put the loop outside of the clock branch. Move the for loop into the clocked bit of the process.