Let's say I have a single bit std_vector called x, and 4 bit std_vector y. I want to AND all of the bits of y with x separately in a process. I know that I can do it in multiple lines like this:
output(3) <= y(3) and x;
output(2) <= y(2) and x;
output(1) <= y(1) and x;
output(0) <= y(0) and x;
But I want to do that in single line. How can I achieve it? Thanks.
You can create another signal where x is repeated as many times as needed, so that you can and it with the whole y vector at once.
signal xs : std_logic_vector(1 to y'length);
xs <= (others => x);
output <= y and xs;
I'm not sure if this can be reduced to a single line.
Or you can just write a loop:
for i in y'low to y'high loop
output(i) <= y(i) and x;
end loop;