Digital Circuit Design II
Online Assignment # 2 :
Complete the following VHDL code to implement a multiplier using repeated addition method.
(e.g. if A=5 and B = 4 , then the product P can be calculated as 5 + 5 + 5 + 5 = 20 )
library IEEE;
use IEEE.std_logic_1164.all; use IEEE.std_logic_unsigned.all;
entity multiplier is
port( CLK : in std_logic;
A, B : in std_logic_vector(3 downto 0); P : out std_logic_vector(7 downto 0)); end multiplier;
architecture behavioral of multiplier is
Your design should include the following pins:
1. CLK: (positive edge trigger input clock)
2. A: The first number (4 bits)
3. B: The Second number (4 bits)
4. P: The result (8 bits) Notes:
• Use behavioral description
• The calculation should be synchronous with the clock (the product should be calculated at the rising edge of the input clock)
You have to submit two files:
1. A VHDL code to implement your Design.
2. A testbench file to simulate and test your design:
a. You have to cover all the possible cases for the input data (256 different cases)
b. For each case you have to:
• Select two values for A and B.
• Wait for two clock cycles
