How to convert 8 bits to 16 bits in VHDL?

Question

I have an input signal from ADC convertor that is 8 bits (std_logic_vector(7 downto 0)). I have to convert them to a 16 bits signal (std_logic_vector(15 d

Answer 1

For completeness, yet another way which is occasionally useful:

--  Clear all the slv_16 bits first and then copy in the bits you need.  
process (slv_8)
begin
    slv_16 <= (others => '0');
    slv_16(7 downto 0) <= slv_8;
end process;

I've not had to do this for vectors that I can recall, but I have had need of this under more complex circumstances: copying just a few relevant signals into a bigger, more complex, record was one time.