Problem 2:

Design a 16-bit Shifter unit with A, B, Type and Direction as inputs and ShiftOut as output. The value of A should be shifted or rotated by the value specified in B. The “Direction” bit is used to determine whether to shift/rotate left(0) or right(1). The “Op_Type” bit is used to determine whether to Shift(0) or Rotate(1) the data. This 16-bit Shifter has the following entity declaration:

entity ShiftUnit16Bits is

 port(A, B : IN std_logic_vector(15 downto 0);

 Direction, Op_Type : IN std_logic;

 ShiftOut : OUT std_logic_vector(15 downto 0));

end ShiftUnit16Bits;

 The “Direction” bit is used to determine whether to shift/rotate left (0) or right (1).

 The “Op_Type” bit is used to determine whether to shift(0) or rotate(1)

 The value of A should be shifted by the value specified in B.

 The shifted bits are replaced by 0.

Write a test bench that verifies the functionality of your design; make sure to have all possible operations of this unit in your test bench.

Below table describes this unit’s behavior:

Report : VHDL code and waveforms