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CLyna's avatar
CLyna
Icon for New Contributor rankNew Contributor
7 years ago

Hi guys I am writing code for shifting rows section in an AES algorithm stuck getting errors.

I am trying to create a matrix from a vector using for loops then mapping a matrix to move them to there required positions. but i keep getting the error Error (10028): Can't resolve multiple constan...
sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
7 years ago

I think the problem is you have your reset and loading of matrix1 in two separate processes, causing multiple drivers into matrix1. The code should probably look like this:

process (reset, clock)

BEGIN

if(reset) then

for i in 15 downto 0 loop

matrix1(15-i) <= (others => '0');

matrix2(15-i) <= (others => '0');

end loop;

elsif (start and rising_edge(clock)) then

FOR i IN 15 downto 0 LOOP

matrix1(15-i) <= data_in((8*i)+(7 downto (8*i)));

END LOOP;

else matrix1 <= matrix1;

end if;

end process;

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