Vhdl Lab Programs

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PAGE NO: FULL ADDER

AIM: Design and verify full adder by using dataflow style with select statement. PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity fa_select is port(a:in bit_vector(2 downto 0); s:out bit_vector(1 downto 0)); end fa_select ; architecture beh of fa_select is begin with a select s<=("00")when"000", ("10")when"001", ("10")when"010", ("01")when"011", ("10")when"100", ("01")when"101", ("01")when"110", ("11")when"111"; end beh; SIMULATION OUTPUT:

RESULT: Full adder using dataflow style with select statement is simulated and Verified.

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PAGE NO: FULL SUBTRACTOR

AIM: Design and verify full subtractor by using dataflow style with select statement. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity flsub_select is port(a:in bit_vector(2 downto 0); s:out bit_vector(1 downto 0)); end flsub_select; architecture beh of flsub_select is begin with a select s<=("00") when "000", ("11") when "001", ("11") when "010", ("01") when "011", ("10") when "100", ("00") when "101", ("00") when "110", ("11") when "111"; end beh; SIMULATION OUTPUT:

RESULT: Full subtractor using dataflow style with select statement is simulated and verified.

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FULL ADDER AIM: Design and verify full adder by using dataflow style with select statement PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity fa_select1 is port(a,b,c:in bit; sum,carry:out bit); end fa_select1; architecture df of fa_select1 is begin with bit_vector'(a,b,c) select (sum,carry)<=bit_vector'("00") when "000" , bit_vector'("10") when "001", bit_vector'("10") when "010", bit_vector'("10") when "100", bit_vector'("01") when "110", bit_vector'("01") when "011", bit_vector'("01" )when "101", bit_vector'("11") when "111"; end df; SIMULATION OUTPUT:

RESULT: Full adder is simulated and verified

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FULL ADDER AIM: Design and verify full adder by using behavioural model with if,elsif& then statements. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity fulladder is port(a:in std_logic_vector(2 downto 0); s,ca:out std_logic); end fulladder; architecture fulladder of fulladder is begin process(a) begin if a="000" then s<='0';ca<='0'; elsif a="001" then s<='1';ca<='0'; elsif a="010" then s<='1';ca<='0'; elsif a="011" then s<='0';ca<='1'; elsif a="100" then s<='1';ca<='0'; elsif a="101" then s<='0';ca<='1'; elsif a="110" then s<='0';ca<='1'; else s<='1';ca<='1'; end if; end process; end fulladder; SIMULATION OUTPUT:

RESULT: Full adder is simulated and verified

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FULL SUBTRACTOR AIM: Design and verify full subtractor by using behavioural model with if,elsif& then statements. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity fullsub is port(a:in std_logic_vector(2 downto 0); d,b:out std_logic); end fullsub; architecture fullsub of fullsub is begin process(a) begin if a="000" then d<='0';b<='0'; elsif a="001" then d<='1';b<='1'; elsif a="010" then d<='1';b<='1'; elsif a="011" then d<='0';b<='1'; elsif a="100" then d<='1';b<='0'; elsif a="101" then d<='0';b<='0'; elsif a="110" then d<='0';b<='0'; else d<='1';b<='1'; end if; end process; end fullsub; SIMULATION OUTPUT:

RESULT: Full adder is simulated and verified

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FULL ADDER (DATAFLOW STYLE) AIM: Design and verify full adder by using dataflow style . PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity fa1 is port(a,b,c:in bit;s,cout:out bit); end fa1; architecture fa1 of fa1 is begin s<=a xor b xor c; cout<=(a and b)or(a and c)or (b and c); end fa1; SIMULATION OUTPUT:

RESULT: Full adder is simulated and verified

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HALF ADDER ( DATAFLOW STYLE) AIM: Design and verify half adder by using dataflow style . PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity ha1 is port(a,b:in bit;s,c:out bit); end ha1; architecture ha1 of ha1 is begin s<=a xor b; c<=a and b; end ha1; SIMULATION OUTPUT:

RESULT: Half adder is simulated and verified

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HALF SUBTRACTOR ( DATAFLOW STYLE ) AIM: Design and verify half subtractor by using dataflow style . PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity hs1 is port(a,b:in bit;d,bo:out bit); end hs1; architecture hs1 of hs1 is begin d<=a xor b; bo<=(not a) and b; end hs1; SIMULATION OUTPUT:

RESULT: Half subtractor is simulated and verified

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FULL SUBTRACTOR ( DATAFLOW STYLE ) AIM: Design and verify full subtractor by using dataflow style . PROGRAM: library ieee; use ieee.std_logic_1164.all; entity fs1 is port(a,b,c:in bit;d,bo:out bit); end fs1; architecture fs1 of fs1 is begin d<=a xor b xor c; bo<=((not a)and b)or(b xor c); end fs1; SIMULATION OUTPUT:

RESULT: Full subtractor is simulated and verified

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AND GATE AIM: Simulation and verification of various logic gates. PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity and2 is port(a,b:in bit;y:out bit); end and2; architecture and2 of and2 is begin y <= a and b; end and2; SIMULATION OUTPUT:

RESULT: AND gate is simulated and verified

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OR GATE AIM: Simulation and verification of various logic gates. PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity or2 is port(a,b:in bit;y:out bit); end or2; architecture or2 of or2 is begin y<=a or b; end or2; SIMULATION OUTPUT:

RESULT: OR gate is simulated and verified.

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XOR GATE AIM: Simulation and verification of various logic gates. PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity xor2 is port(a,b:in bit;y:out bit); end xor2; architecture xor2 of xor2 is begin y<=a xor b ; end xor2; SIMULATION OUTPUT:

RESULT: XOR gate is simulated and verified

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NAND GATE AIM: Simulation and verification of various logic gates. PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity nand2 is port(a,b:in bit;y:out bit); end nand2; architecture nand2 of nand2 is begin y<=a nand b; end nand2; SIMULATION OUTPUT:

RESULT: NAND gate is simulated and verified.

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NOR GATE AIM: Simulation and verification of various logic gates. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity nor2 is port(a,b:in bit;y:out bit); end nor2; architecture nor2 of nor2 is begin y<=a nor b; end nor2; SIMULATION OUTPUT:

RESULT: NOR gate is simulated and verified

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XNOR GATE AIM: Simulation and verification of various logic gates. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity xnor2 is port(a,b:in bit;y:out bit); end xnor2; architecture xnor2 of xnor2 is begin y<=a xnor b; end xnor2; SIMULATION OUTPUT:

RESULT: NOR gate is simulated and verified

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NOT GATE AIM: Simulation and verification of various logic gates. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity not1 is port(x:in bit;y:out bit); end not1; architecture df of not1 is begin y<=not x; end df; SIMULATION OUTPUT:

RESULT: NOT gate is simulated and verified

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3-INPUT NAND GATE AIM: Simulation and verification of 3-Input NAND gate. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity nand3 is port(a,b,C:in bit;y:out bit); end nand3; architecture nand3 of nand3 is begin y <= not(a and b and C); end nand3; SIMULATION OUTPUT:

RESULT: 3-INPUT NAND gate is simulated and verified

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4-INPUT NAND GATE AIM: Simulation and verification of 4-Input NAND gate. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity nand4 is port(a,b,C,d:in bit;y:out bit); end nand4; architecture nand4 of nand4 is begin y <= not(a and b and C and d); end nand4; SIMULATION OUTPUT:

RESULT: 4-INPUT NAND gate is simulated and verified.

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FUNCTION VERIFICATION AIM: Design and verification of function F(a,b,c) =∑ (0,2,4,5,6). PROGRAM library ieee; use ieee.std_logic_1164.all; entity function1 is port(a,b,c:in bit;y:out bit); end function1; architecture fun1 of function1 is begin y<= (a and (not b))or (not c); end fun1; SIMULATION OUTPUT:

RESULT: Function F(a,b,c) =∑ (0,2,4,5,6) is simulated and verified.

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FUNCTION VERIFICATION AIM: Design and verification of function F(a,b,c) =∑ (1,2,3,5,7). PROGRAM: library ieee; use ieee.std_logic_1164.all; entity function2 is port(a,b,c:in bit;y:out bit); end function2; architecture fun2 of function2 is begin y<= ((not a)and b)or c; end fun2; SIMULATION OUTPUT:

RESULT: Function F(a,b,c) =∑ (1,2,3,5,7) is simulated and verified.

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FUNCTION VERIFICATION AIM: Design and verification of function F(a,b,c,d ) =∑ (0,1,2,4,5,6,8,9,12,13,14). PROGRAM: library ieee; use ieee.std_logic_1164.all; entity function3 is port(a,b,c,d:in bit;y:out bit); end function3; architecture fun3 of function3 is begin y<= (not c)or ((not a)and (not d))or( b and (not d )); end fun3; SIMULATION OUTPUT:

RESULT: Function F(a,b,c,d) =∑ (0,1,2,4,5,6,8,9,12,13,14) is simulated and verified.

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PAGE NO: FUNCTION VERIFICATION

AIM: Design and verification of function F(a,b,c,d) =∑ (0,2,4,6,9,13,21,23,25,29,31). PROGRAM: library ieee; use ieee.std_logic_1164.all; entity function4 is port(a,b,c,d,e:in bit;y:out bit); end function4; architecture fun4 of function4 is begin y<= ((not a)and (not b)and (not e))or( b and (not d )and e) or (a and c and e ); end fun4;

RESULT:Function F(a,b,c,d) =∑(0,2,4,6,9,13,21,23,25,29,31) is simulated and verified

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PAGE NO: HALF ADDER (STRUCTURAL MODEL)

AIM: Simulation and verification of Half Adder using structural model. PROGRAM: Library ieee; use ieee.std_logic_1164.all; use vamsi.all; entity hfadder is port(A,B:in bit;S,C:out bit); end hfadder; architecture struct of hfadder is component xor1 is port(a,b:in bit;c:out bit); end component; component and1 is port(a,b:in bit;c:out bit); end component; Begin X1:xor1 port map(A,B,S); X2:and1 port map(A,B,C); end struct; SIMULATION OUTPUT: :

RESULT: Half Adder is simulated and verified.

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PAGE NO: FULL ADDER (STRUCTURAL MODEL)

AIM: Simulation and verification of Full Adder using structural model. PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity fa2 is port(a1,b1,c1:in bit;sum,cout1:out bit); end fa2; use vamsi.all; architecture struc of fa2 is component xor2 port(a,b:in bit; y:out bit); end component; component and2 port(a,b:in bit;y:out bit); end component; component or2 port(a,b:in bit;y:out bit); end component; signal s1,s2,s3,s4,s5:bit; begin d1:exor1 port map(a1,b1,s1); d2:exor1 port map(s1,c1,sum); d3:and1 port map(a1,b1,s2); d4:and1 port map(a1,c1,s3); d5:and1 port map(b1,c1, s4); d6:or1 port map(s2,s3,s5); d7:or1 port map(s4,s5,cout1); end struc; SIMULATION OUTPUT:

RESULT: Full Adder is simulated and verified.

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PAGE NO: HALF SUBTRACTOR (STRUCTURAL MODEL)

AIM: Simulation and verification of Half Subtractor using structural model. PROGRAM: Library ieee; use ieee.std_logic_1164.all; use vamsi.all; entity hfsub is port(A,B:in bit;D,B0:out bit); end hfsub; architecture struct of hfsub is component xor2 is port(a,b:in bit;y:out bit); end component; component and2 is port(a,b:in bit;y:out bit); end component; component not1 is port(a:in bit;y:out bit); end component; signal s:bit; Begin X1:xor1 port map(A,B,D); X2:not1 port map(A,s); X3:and1 port map(s,B,B0); end struct; SIMULATION OUTPUT:

RESULT: Half Subtractor is simulated and verified.

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PAGE NO: FULL SUBTRACTOR (STRUCTURAL MODEL)

AIM: Simulation and verification of Full Subtractor using structural model. PROGRAM: Library ieee; use ieee.std_logic_1164.all; use vamsi.all; entity fulsub is port(A,B,C:in bit;D,Bo:out bit); end fulsub; architecture struct of fulsub is component and2 is port(a,b:in bit;y:out bit); end component; component xor2 is port(a,b:in bit;y:out bit); end component; component or2 is port(a,b:in bit;c:out bit); end component; component not1 is port(a:in bit;y:out bit); end component; signal S0,S1,S2,S3,S4,S5:bit; Begin X1:xor1 port map(A,B,S1); X2:xor1 port map(S1,C,D); X3:not1 port map(A,S0); X4:and1 port map(S0,B,S2); X5:and1 port map(S0,C,S3); X6:or1 port map(S2,S3,S5); X7:and1 port map(B,C,S4); X8:or1 port map(S5,S4,Bo); end struct;

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SIMULATION OUTPUT :

RESULT: Full Subtractor is simulated and verified.

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PAGE NO: 2 TO 4 DECODER

(DATAFLOW STYLE )

AIM: Simulation and verification of 2 x 4 AND gate decoder. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity dec24 is port(a,b,e:in std_logic; z:out std_logic_vector(0 to 3)); end dec24; architecture data of dec24 is begin z(0)<= NOT((not a) AND (not b) AND e); z(1)<= NOT (B AND (not a) and e); z(2)<= NOT(a and (not b) and e); z(3)<= NOT(a and b and e); end data; SIMULATION OUTPUT:

RESULT: 2 to 4 Decoder is simulated and verified.

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PAGE NO: 2 TO 4 DECODER (BEHAVIOURAL MODEL )

AIM: Simulation and verification of 2 to 4 NAND gate decoder. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity dec is port(a,b,e:in bit;z0,z1,z2,z3:out bit); end dec; architecture bm3 of dec is begin process(a,b,e) variable abar,bbar:bit; begin abar:=not a; bbar:=not b; if e='1' then z3<=not(a and b); z0<=not(abar and bbar); z2<=not(a and bbar); z1<=not(abar and b); end if; end process; end bm3; SIMULATION OUTPUT: :

RESULT: 2 to 4 Decoder is simulated and verified.

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PAGE NO: 4 TO 1 MULTEPLXER (DATA FLOW STYLE )

AIM: Simulation and verification of 4 x 1 NAND gate decoder. PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity mu4to1 is port(i0,i1,i2,i3:in bit; s:in bit_vector(1 downto 0); z:out bit); end mu4to1; architecture df1 of mu4to1 is signal t0,t1,t2,t3,t4:bit; begin t0<=(i0 and not s(1) and not s(0)); t1<=(i1 and not s(1) and s(0)); t2<=(i2 and s(1) and not s(0)); t3<=(i3 and s(1) and s(0)); z<=t0 or t1 or t2 or t3; end df1; SIMULATION OUTPUT: :

RESULT: 4 to 1 Multiplexer is simulated and verified.

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PAGE NO: 9 BIT PARITY GENERATOR (STRUCTURAL MODEL)

AIM: Simulation and verification of 9-bit parity generator using structural model. PROGRAM: Library ieee; use ieee.std_logic_1164.all; use vamsi.all; entity pg is port(d0,d1,d2,d3,d4,d5,d6,d7,d8:in bit;od:out bit); end pg; architecture str of pg is component xor2 port(a,b:in bit;y:out bit); end component; component not1 port(a:in bit;y:out bit); end component; signal e0,e1,e2,e3,f0,f1,a0,ev:bit; begin x1:xor2 port map(d0,d1,e0); x2:xor2 port map(d2,d3,e1); x3:xor2 port map(d4,d5,e2); x4:xor2 port map(d6,d7,e3); x5:xor2 port map(f0,f1,a0); x6:xor2 port map(a0,d8,ev); x7:not1 port map(ev,od); end str;

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SIMULATION OUTPUT:

RESULT: 9 bit Priority encoder is simulated and verified.

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PAGE NO: 17 BIT PARITY GENERATOR (STRUCTURAL MODEL)

AIM: Simulation and verification of 17-bit parity generator using structural model. PROGRAM: Library ieee; use ieee.std_logic_1164.all; use vamsi.all; entity pg1 is port(d0,d1,d2,d3,d4,d5,d6,d7,d8,d9,d10,d11,d12,d13,d14,d15,d16:in bit; od:buffer bit;ev:buffer bit); end pg1; architecture str of pg1 is component xor2 port(a,b:in bit;y:out bit); end component; component xor2 port(a,b:in bit;y:buffer bit); end component; component not1 port(a:in bit;y:buffer bit); end component; signal e0,e1,e2,e3,e4,e5,e6,e7,a0,a1,a2,a3,b0,b1,f0:bit; begin x1:xor2 port map(d0,d1,e0); x2:xor2 port map(d2,d3,e1); x3:xor2 port map(d4,d5,e2); x4:xor2 port map(d6,d7,e3); x5:xor2 port map(d8,d9,e4); x6:xor2 port map(d10,d11,e5); x7:xor2 port map(d12,d13,e6); x8:xor2 port map(d14,d15,e7); x9:xor2 port map(e0,e1,a0); x10:xor2 port map(e2,e3,a1); x11:xor2 port map(e4,e5,a2); x12:xor2 port map(e6,e7,a3); x13:xor2 port map(a0,a1,b0); x14:xor2 port map(a2,a3,b1); x15:xor2 port map(b0,b1,f0); x16:xor2 port map(f0,d16,od); x17:not1 port map(od,ev); end str;

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SIMULATION OUTPUT: :

RESULT: 17- bit Priority encoder is simulated and verified

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PAGE NO: ALU (ARITHMATIC OPERATIONS)

AIM: simulation and verification of arithmetic operations. PROGRAM: library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; entity arithmatic is port(a,b:in std_logic_vector(3 downto 0); q1:out std_logic_vector(4 downto 0); q2:out std_logic_vector(3 downto 0); q3:out std_logic_vector(7 downto 0)); end arithmatic; architecture df of arithmatic is begin q1<=('0'&a)+('0'&b); q2<=a-b; q3<=a*b; end df; SIMULATION OUTPUT: :

RESULT: ALU is simulated and verified.

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PAGE NO: ALU(1’s&2’s COMPLEMENTATION)

AIM: simulation and verification of 1’s 2’s complement arithmetic operations. PROGRAM: library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all; use ieee.std_logic_unsigned.all; entity complement is port(a:in std_logic_vector(4 downto 0); c2:out std_logic_vector(4 downto 0)); end complement; architecture beh of complement is signal c1:std_logic_vector(4 downto 0); begin c1<=(not a); c2<=c1 + 1; end beh; SIMULATION OUTPUT: :

RESULT:ALU is simulated and verified.

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PAGE NO: BCD TO EXCESS-3 CODE CONVERSION

AIM: simulation and verification of BCD to Excess – 3 code. PROGRAM: library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; entity bin2ex3 is port(d: in std_logic_vector(3 downto 0); q: out std_logic_vector(3 downto 0);p:out std_logic); end bin2ex3; architecture bin2ex3 of bin2ex3 is signal s:std_logic_vector(4 downto 0); begin s<=('0'& d)+"0011"; q<=s(3 downto 0); p<=s(4); end bin2ex3; SIMULATION OUTPUT: :

RESULT: BCD TO EXCESS-3 CODE CONVERSION is simulated and verified

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PAGE NO: 2 TO 4 DECODER (STRUCTURAL MODEL)

AIM: Simulation and verification of 2 x 4decoder. PROGRAM: Library ieee; use ieee.std_logic_1164.all; use soujanya.all; entity twoto4dec is ort(A,B,E:in bit;Z0,Z1,Z2,Z3:out bit); end twoto4dec; architecture struct of twoto4dec is component nand2 is port(a,b,c:in bit;y:out bit); end component; component not1 is port(a:in bit;y:out bit); end component; signal A0,B0:bit; Begin X1:not1 port map(A,A0); X2:not1 port map(B,B0); X3:nand2 port map(A0,B0,E,Z0); X4:nand2 port map(A0,B,E,Z1); X5:nand2 port map(A,B0,E,Z2); X6:nand2 port map(A,B,E,Z3); end struct; SIMULATION OUTPUT: :

RESULT: 2 to 4 Decoder is simulated and verified.

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PAGE NO: BINARY TO GRAY CODE CONVERSION

AIM: simulation and verification of binary to gray code conversion. PROGRAM: library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; entity bi_to_g is port(b:in std_logic_vector(3 downto 0); g:out std_logic_vector(3 downto 0)); end bi_to_g; architecture df of bi_to_g is begin g(3)<=b(3); g(2)<=b(3) xor b(2); g(1)<=b(2) xor b(1); g(0)<=b(1) xor B(0); end df; SIMULATION OUTPUT: :

RESULT: BINARY TO GRAY CODE CONVERSION is simulated and verified.

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PAGE NO: GRAY TO BINARY CODE CONVERSION

AIM: simulation and verification of gray to binary code conversion. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity gryb2 is port(d: in std_logic_vector(3 downto 0);q: out std_logic_vector(3 downto 0)); end gryb2; architecture gryb2 of gryb2 is begin q(3)<=d(3); q(2)<=d(3) xor d(2); q(1)<=d(1) xor d(2) xor d(3); q(0)<=d(1) xor d(0) xor d(2) xor d(3); end gryb2; SIMULATION OUTPUT: :

RESULT: GRAY TO BINARY CODE CONVERSION is simulated and verified.

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PAGE NO: RS LATCH (BEHAVIOURAL MODEL )

AIM: Simulation and verification of RS-latch using behavioural model PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity rslatch is port(r,s,clk:in bit;q,nq:inout bit); end rslatch; architecture beh of rslatch is signal temp:bit; begin b1: block(clk='1') begin temp<=guarded(r nand q); nq<=temp; q<=s nand nq after 5 ns; end block b1; end beh; SIMULATION OUTPUT: :

RESULT: RS LATCH is simulated and verified.

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PAGE NO: T -FLIP FLOP (BEHAVIOURAL MODEL)

AIM: Simulation and verification of T- FLIP FLOP using behavioural model PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity tff is port(t,clk:in std_logic; q:inout std_logic:='0'); end tff; architecture beh of tff is begin process(clk) begin if (clk' event and clk='1') then if(t='1') then q<= not (q); else q<=q; end if; end if; end process; end beh; SIMULATION OUTPUT: :

RESULT: T FLIP FLOP is simulated and verified.

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PAGE NO: D-LATCH (BEHAVIOURAL MODEL WITH DATA ,ENABLE )

AIM: Simulation and verification of D- LATCH using behavioural model PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity dl2 is port(d,e:in bit; q:out bit); end dl2; architecture beh of dl2 is begin process(d,e) begin if e='1' then q<=d; end if; end process; end beh; SIMULATION OUTPUT: :

RESULT: D- LATCH is simulated and verified.

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EXPT NO:

PAGE NO: POSITIVE LEVEL TRIGGERED D-FLIP FLOP .

AIM: Simulation and verification of positive level triggered D-FLIP FLOP using behavioural model PROGRAM: library ieee; entity dff2 is port(d,clk:in bit;q:out bit); end dff2; architecture dff of dff2 is begin process(d,clk) begin if clk='1' then q<=d; end if; end process; end dff; SIMULATION OUTPUT: :

RESULT: positive level triggered D-FLIP FLOP using behavioural model is simulated

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PAGE NO: POSITIVE EDGE TRIGGERED D-FLIP FLOP.

AIM: Simulation and verification of positive edge triggered D-FLIP FLOP using behavioural model PROGRAM: library ieee; entity dff3 is port(d,clk:in bit;q:out bit); end dff3; architecture dfn of dff3 is begin process(clk) begin if clk'event and clk='1' then q<=d; end if; end process; end dfn; SIMULATION OUTPUT: :

RESULT: Positive edge Triggered D-FLIP FLOP using behavioural model is simulated and verified.

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PAGE NO: D-LATCH WITH GATED ENABLE

AIM: Simulation and verification of D-LATCH with gated enable using behavioural model PROGRAM: library ieee; use ieee.std_logic_1164.all; entity dl1 is port(d,en,g:in bit;q:out bit); end dl1; architecture beh of dl1 is begin process(d,en,g) begin if ((en and g)='1') then q<=d; end if; end process; end beh; SIMULATION OUTPUT: :

RESULT: D-LATCH with gated enable using behavioural model is simulated and verified.

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EXPT NO:

PAGE NO: JK FLIP FLOP ( BEHAVIOURAL MODEL).

AIM: Simulation and verification of JK FLIP FLOP using behavioural model. PROGRAM: Library ieee; use ieee.std_logic_1164.all; entity jkff1 is port (s,r,j,k,clk:in bit;q:inout bit;qn:out bit:='1'); end jkff1; architecture jkff of jkff1 is begin process(s,r,clk) begin if r='0' then q<='0' after 10ns; elsif s='0' then q<='1' after 10ns; elsif clk='0' and clk' event then q<=(j and not q) or (not k and q) after 10ns; end if; end process; qn<=not q; end jkff; SIMULATION OUTPUT: :

RESULT: JK-FLIP FLOP using behavioural Model is simulated and verified.

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EXPT NO:

PAGE NO: 2 TO 4 DECODER

AIM: Simulation and verification of 2 To 4 Decoder using NAND gates. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity dec24 is port(a,b,e:in std_logic; z:out std_logic_vector(0 to 3)); end dec24; architecture data of dec24 is begin z(0)<= NOT((not a) AND (not b) AND e); z(1)<= NOT (B AND (not a) and e); z(2)<= NOT(a and (not b) and e); z(3)<= NOT(a and b and e); end data; SIMULATION OUTPUT:

RESULT: 2 to 4 Decoder is simulated and verified.

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PAGE NO: 3 TO 8 DECODER

AIM: Simulation and verification of 3 to 8 decoder using NAND gates. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity dec38 is port(a,b,c,e:in std_logic; z:out std_logic_vector(0 to 7)); end dec38; architecture beh of dec38 is begin z(0)<=not((not a)and(not b)and (not c)and e); z(1)<=not((not a)and(not b)and c and e); z(2)<=not((not a)and b and(not c)and e); z(3)<=not((not a) and b and c and e); z(4)<=not(a and(not b)and(not c) and e); z(5)<=not(a and(not b)and c and e); z(6)<=not(a and b and(not c) and e); z(7)<=not(a and b and c and e); end beh;

RESULT: 3 to 8 Decoder is simulated and verified.

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PAGE NO: 2 TO 1 MULTIPLEXER

AIM: Simulation and verification of 2 to1 Multiplexer. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity mux21 is port(a,b,s:in bit;f:out bit); end mux21; architecture beh of mux21 is begin f<= (a and (not s)) or (b and s); end beh; SIMULATION OUTPUT:

RESULT: 2 to 1 Multiplexer is simulated and verified.

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EXPT NO:

PAGE NO: 3 TO 8 DECODER

AIM: Simulation and verification of 3 to 8 Decoder. PROGRAM: library ieee; use ieee.std_logic_1164.all; entity dec38 is port(a,b,c,e:in std_logic; z:out std_logic_vector(0 to 7)); end dec38; architecture beh of dec38 is begin z(0)<=(not a)and(not b)and (not c)and e; z(1)<=(not a)and(not b)and c and e; z(2)<=(not a)and b and(not c)and e; z(3)<=(not a) and b and c and e; z(4)<=a and(not b)and(not c) and e; z(5)<=a and(not b)and c and e; z(6)<=a and b and(not c) and e; z(7)<=a and b and c and e; end beh; SIMULATION OUTPUT:

RESULT: 3 to 8 Decoder is simulated and verified.

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PAGE NO: 3 TO 8 DECODER (STRUCTURAL MODEL)

AIM: Simulation and verification of 3 to 8 Decoder Using Structural Model. PROGRAM: library ieee; use ieee.std_logic_1164.all; use dsce04.all; entity dec37 is port(a,b,c,e:in bit; z0,z1,z2,z3,z4,z5,z6,z7:out bit); end dec37; architecture struc of dec37 is component and4 is port(g,h,i,j:in bit; k:out bit); end component; component not1 is port(a:in bit; b:out bit); end component; signal s1,s2,s3:bit; begin x1:not1 port map(a,s1); x2:not1 port map(b,s2); x3:not1 port map(c,s3); x4:and4 port map(s1,s2,s3,e,z0); x5:and4 port map(s1,s2,c,e,z1); x6:and4 port map(s1,b,s3,e,z2); x7:and4 port map(s1,b,c,e,z3); x8:and4 port map(a,s2,s3,e,z4); x9:and4 port map(a,s2,c,e,z5); x10:and4 port map(a,b,s3,e,z6); x11:and4 port map(a,b,c,e,z7); end struc;

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PAGE NO:

SIMULATION OUTPUT:

RESULT: 3 to 8 Decoder Using Structural Model is simulated and verified.

NARASARAOPET ENGINEERING COLLEGE -NARASARAOPET

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PAGE NO: 4 BIT FULL ADDER (STRUCTURAL MODEL)

AIM: Simulation and verification of 4 Bit Full Adder Using Structural Model. PROGRAM: Library ieee; use ieee.std_logic_1164.all; use dsce04.all; entity adder1 is port(x0,x1,x2,x3,y0,y1,y2,y3:in std_logic; c:in std_logic; cout:out std_logic; s0,s1,s2,s3:out std_logic); end adder1; architecture str of adder1 is signal c1,c2,c3:std_logic; component fa3 port(x,y,c:in std_logic;s,cout:out std_logic); end component ; begin n1:fa3 port map(x0,y0,c,s0,c1); n2:fa3 port map(x1,y1,c1,s1,c2); n3:fa3 port map(x2,y2,c2,s2,c3); n4:fa3 port map(cout=>cout,c=>c3,x=>x3,y=>y3,s=>s3); end str; SIMULATION OUTPUT: :

RESULT: 4 Bit Full Adder Using Structural Model is simulated and verified.

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PAGE NO:

4 TO 16 DECODER (STRUCTURAL MODEL) AIM: Simulation and verification of 4 to 16 Decoder Using Structural Model. PROGRAM: library ieee; use ieee.std_logic_1164.all; use dsce04.all; entity dec416 is port(w0,w1,w2,w3,e:in std_logic; q:out std_logic_vector(0 to 15)); end dec416; architecture struc of dec416 is component dec24 is port(a,b,e:in std_logic; z0,z1,z2,z3:out std_logic); end component; signal p0,p1,p2,p3: std_logic; begin x1:dec24 port map(w0,w1,e,p0,p1,p2,p3); x2:dec24 port map(w2,w3,p0,q(0),q(1),q(2),q(3)); x3:dec24 port map(w2,w3,p1,q(4),q(5),q(6),q(7)); x4:dec24 port map(w2,w3,p2,q(8),q(9),q(10),q(11)); x5:dec24 port map(w2,w3,p3,q(12),q(13),q(14),q(15)); end struc; SIMULATION OUTPUT: :

RESULT: 4 to 16 Decoder Using Structural Model is simulated and verified.

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PAGE NO: D-FLIP FLOP

AIM: Simulation and verification of D-Flip Flop Using Behavioural Model PROGRAM: library ieee; entity dff2 is port(d,clk:in bit;q:out bit); end dff2; architecture dff of dff2 is begin process(d,clk) begin if clk='1' then q<=d; end if; end process; end dff; SIMULATION OUTPUT: :

RESULT: D-FLIP FLOP Using Behavioural Model is simulated and verified.

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PAGE NO: FUNCTION VERIFICATION (STRUCTURAL MODEL)

AIM: Design and verification of function F(a,b,c,d) =∑ (0,1,2,4,5,6,8,9,12,13,14) Using Structural Model PROGRAM: library ieee; use ieee.std_logic_1164.all; use dsce04.all; entity kmap1 is port(w,x,y,z:in bit; f:out bit); end kmap1; architecture struc of kmap1 is component or2 is port(a,b,c:in bit;d:out bit); end component; component and1 is port(g,h:in bit; i:out bit); end component; component not1 is port(a:in bit; b:out bit); end component; signal s1,s2,s3,s4,s5:bit; begin x1:not1 port map(w,s1); x2:not1 port map(z,s2); x3:not1 port map(y,s3); x4:and1 port map(s1,s2,s4); x5:and1 port map(s2,x,s5); x6:or2 port map(s3,s4,s5,f); end struc; SIMULATION OUTPUT: :

RESULT: Function F(a,b,c,d) =∑ (0,1,2,4,5,6,8,9,12,13,14)Using Structural Model is simulated and verified.

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