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Altera_Forum's avatar
Altera_Forum
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9 years ago

Resize function not working

I'm trying to use the resize function in order to convert a signed 12 bit value to a 31 bit value. But whenever I'm using the resize function the output value is 0. But when I'm manually converting i...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

--- Quote Start ---

you didn't show your code. if it is std_logic_vector you need to define if it is resized as signed or unsigned so that negative values are filled with ones.

data_resized <= resize(signed(data),18); -- assuming data is 16 bits std_logic_vector

--- Quote End ---

data_in : IN std_logic_vector(11 downto 0); ( including the signed bit )

-- converting to 31 bit

signal l_data_in : signed(30 downto 0);

l_data_in <= resize(signed(data_in),31);

I was using the same thing that you posted, but all my converted values were 0 when I checked in signaltap