[Solved] CPE526 Homework2-Combinational Modeling

Cryptographic applications commonly require circular shifts. Whereas these shifts can be accomplished using a shift register, combinational shifting is required to complete these operations in a reasonable amount of time. Design an 8 bit barrel shifter that has 8 data inputs and 8 data outputs, and 3 control inputs that determine the shift amount (0-7). An additional enable input controls whether the outputs are tri-state or not. Use the truth table below as the functionality and use the entity declaration given.

en s2 s1 s0 c7 c6 c5 c4 c3 c2 c1 c0

Use the following entity

entity barrel is

port (a : in std_logic_vector (7 downto 0); s : in std_logic (2 downto 0; en : in std_logic;

c : out std_logic_vector (7 downto 0)); end entity barrel;

Develop a behavioral architecture for the system.

Perform the following steps

1. Modify the test bench given in homework #1 to test this circuit.
2. Compile all of the files
3. Simulate to verify correctness.

Turn in all VHDL files.