Piso 253vj

AIM:- Write a VHDL program to implement PISO.

entity andg is port(a,b:in bit; c: out bit); end andg;

-- entity declaration -- declaration of input output port -- end of entity

architecture a1 of andg is begin c<= a and b; end a1;

-- architecture declaration -- architecture body

entity org is port(i,e:in bit; f: out bit); end org;

-- entity declaration -- declaration of input output port -- end of entity

architecture a2 of org is begin f<= i or e; end a2;

-- architecture declaration -- architecture body

entity notg is port(g:in bit;h:out bit); end notg;

-- entity declaration -- declaration of input output port -- end of entity

architecture a3 of notg is begin h<=not g; end a3;

-- architecture declaration -- architecture body -- end of architecture

entity dff is port(d1,clk1:in bit; q1:out bit); end dff;

-- entity declaration -- declaration of input output port -- end of entity

architecture dff1 of dff is signal s:bit; begin process(clk1,d1) begin if(clk1 ='1'and clk1'event) then s<=d1;q1<=s; end if; end process; end dff1;

-- architecture declaration -- architecture body

entity main is port(SL,clk:in bit;d: in bit_vector(0 to 3);

-- end of architecture

-- end of architecture

-- end of architecture -- entity declaration -- declaration of input output port

qout: out bit); end main;

-- end of entity

architecture a5 of main is component andg is port(a,b:in bit; c: out bit); end component;

-- architecture declaration -- component declaration

component org is port(i,e:in bit; f: out bit); end component;

-- component declaration

component notg is port(g:in bit;h:out bit); end component ;

-- component declaration

component dff is port(d1,clk1:in bit; q1:out bit); end component ;

-- component declaration

signal a:bit_vector(0 to 8); signal q:bit_vector(0 to 2); signal SL1:bit; begin g10: notg port map (SL,SL1); g1: andg port map (q(0),SL,a(0)); g2: andg port map (q(1),SL,a(1)); g3: andg port map (q(2),SL,a(2)); g4: andg port map (d(1),SL1,a(3)); g5: andg port map (d(2),SL1,a(4)); g6: andg port map (d(3),SL1,a(5)); g7: org port map (a(0),a(3),a(6)); g8: org port map (a(1),a(4),a(7)); g9: org port map (a(2),a(5),a(8)); dff0: dff port map (d(0),clk,q(0)); dff1: dff port map (a(6),clk,q(1)); dff2: dff port map (a(7),clk,q(2)); dff3: dff port map (a(8),clk,qout); end a5;

-- end of architecture

AIM:- Write a VHDL program to implement PISO LIBRARY IEEE; USE IEEE.STD_LOGIC_1164.ALL; USE IEEE.STD_LOGIC_UNSIGNED.ALL; USE IEEE.STD_LOGIC_ARITH.ALL; ENTITY PTS IS PORT(X : IN STD_LOGIC_VECTOR(3 DOWNTO 0); CLOCK,RESET : IN STD_LOGIC; Z : OUT STD_LOGIC); END PTS; ARCHITECTURE PTS_A OF PTS IS SIGNAL I: STD_LOGIC ; BEGIN PROCESS(RESET,CLOCK) VARIABLE I : INTEGER; BEGIN IF RESET = '0' THEN Z <= '0'; I := 0; ELSIF(CLOCK'EVENT AND CLOCK = '1') THEN IF I < 4 THEN z <= X(I); ELSE Z <= '0'; END IF; I := I + 1; ELSE NULL; END IF; END PROCESS; END PTS_A;

AIM:- Write a VHDL program to implement PISO( For ECE students)

library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating ---- any Xilinx primitives in this code. --library UNISIM; --use UNISIM.VComponents.all;

entity PISO is PORT(X : IN STD_LOGIC_VECTOR(3 DOWNTO 0); CLOCK,RESET : IN STD_LOGIC; Z : OUT STD_LOGIC); end PISO;

architecture Behavioral of PISO is SIGNAL I: STD_LOGIC ; BEGIN PROCESS(RESET,CLOCK) VARIABLE I : INTEGER; BEGIN IF RESET = '1' THEN Z <= '0';

I := 0;

ELSIF(CLOCK'EVENT AND CLOCK = '1') THEN IF I < 4 THEN z <= X(I); ELSE I := 0; END IF; I := I + 1; ELSE NULL; END IF; END PROCESS; end Behavioral;