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Altera_Forum
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13 years ago

STD_LOGIC_VECTOR multipication

I keep getting an error using the '*' to multiply SLV's: use IEEE.numeric.std.all; constant COEFF : STD_LOGIC_VECTOR (5 downto 0) := x"3F"; signal EXPx63_LTCHD : S...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I do have one final quick question relating to this:

I have a variable called duty that is an unsigned(5 downto 0); and i want to slice off the (5 downto 0) bits of the following equation and assign it to DUTY;

DUTY <= (((WIDTH_LTCHD*PERCENT)/PERIOD_LTCHD);

AT the moment (in the example above) duty is unnecesarily 23 bits wide due to the variables in the equation, but I know for a fact (due to limits) that the result cannot be bigger than a 6bit result;

I tried a few variations and couldnt get the slice right; i tried somethings like:

DUTY <= (((WIDTH_LTCHD*PERCENT)/PERIOD_LTCHD),(5 downto 0));

Thanks guys!