I would like to ask, how can I write vectors in VHDL.
Below I have written the VHDL code in Integers, But I am having
difficulties in writing it as Vectors?
The equation I am working with to find the correct answer from Waveform
is:
FX= A0 +A1x +A2^x2 +A3^x3
1  ENTITY Polynomial1 IS

2  PORT ( clk, res : IN BIT;

3  ai, x : IN INTEGER:=0;

4  fx : OUT INTEGER:=0);

5  END Polynomial1;

6  ARCHITECTURE bhv OF Polynomial1 IS SIGNAL reg : INTEGER:=0;

7  BEGIN

8  PROCESS

9  BEGIN

10  WAIT UNTIL (clk'EVENT AND clk = '1');

11  IF res = '1' THEN reg <= 0;

12  ELSE reg <= x * (ai + reg);

13  END IF;

14  END PROCESS;

15  fx <= reg + ai;

16  END bhv;

I have had a go at Vectors with assumable bits:
1  ENTITY Polynomial1 IS

2  PORT ( clk, reset : IN STD_LOGIC;

3  a0, a1, a2, a3 : IN STD_LOGIC_VECTOR(2 DOWNTO 0);

4  x : IN STD_LOGIC_VECTOR (1 DOWNTO 0);

5  fx: OUT STD_LOGIC_VECTOR(8 DOWNTO 0)) ;

6  END Polynomial1;

I would like to apologies if i have made any format mistakes.