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VHDL code for Basic Gates

AND Gate library ieee; use ieee.std_logic_1164.all; entity and_gate is port (a,b : in std_logic ; c : out std_logic); end and_gate; architecture arc of and_gate is begin c <= a and b; end arc; OR Gate library ieee; use ieee.std_logic_1164.all; entity or_gate is port (a,b : in std_logic ; c : out std_logic); end or_gate; architecture arc of or_gate is begin c <= a or b; end arc; NOT Gate library ieee; use ieee.std_logic_1164.all; entity not_gate is port (a: in std_logic ; b : out std_logic); end not_gate; architecture arc of not_gate is begin b <= not a; end arc; NAND Gate library ieee; use ieee.std_logic_1164.all; entity nand_gate is port (a,b : in std_logic ; c : out std_logic); end nand_gate; architecture arc of nand_gate is begin c <= a or b; end arc; NOR Gate library ieee; use ieee.std_logic_1164.all; entity nor_gate is port (a,b : in std_logic ; c : out std_logic); end nor_gate; architecture ar

VHDL code for Full Adder using structural style

library IEEE; use IEEE.std_logic_1164.all; entity bejoy_fa is port(In1,In2,c_in : in std_logic; sum, c_out : out std_logic); end bejoy_fa; architecture arc of bejoy_fa is component half_adder port(a,b : in std_logic; sum, carry : out std_logic); end component; component or_2 port(a,b : in std_logic; c : out std_logic); end component; signal s1, s2, s3 : std_logic; begin H1: half_adder port map(a=>In1, b=>In2, sum=>s1, carry=>s3); H2: half_adder port map(a=>s1, b=>c_in, sum=>sum, carry=>s2); O1: or_2 port map(a=> s2, b=>s3, c=>c_out); end arc; entity half_adder is port (a,b : in bit ; sum,carry : out bit); end half_adder; architecture arc of half_adder is begin sum<= a xor b; carry <= a and b; end arc; entity or_2 is port (a,b : in bit ; c : out bit); end or_2; architecture arc of or_2 is begin c<= a or b; end arc;