0
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity fabehv is
Port ( ain : in STD_LOGIC;
bin : in STD_LOGIC;
cin : in STD_LOGIC;
sum : out STD_LOGIC;
cout : out STD_LOGIC);
end fabehv;
architecture Behavioral of fabehv is
signal s:std_logic_vector(2 downto 0);
begin
process(ain,bin,cin,s)
begin
s(2)<= ain; s(1)<= bin; s(0)<= cin;
case s is
when "000" => sum<='0'; cout<='0';
when "001" => sum<='1'; cout<='0';
when "010" => sum<='1'; cout<='0';
when "011" => sum<='0'; cout<='1';
when "100" => sum<='1'; cout<='0';
when "101" => sum<='0'; cout<='1';
when "110" => sum<='0'; cout<='1';
when "111" => sum<='1'; cout<='1';
when others => null;
end case;
end process;
end Behavioral;
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What is VHDL program for half adder in behavioral model?
PROGRAM:Library ieee;use ieee.std_logic_1164.all;entity ha1 isport(a,b:in bit;s,c:out bit);end ha1;architecture ha1 of ha1 isbegins
Why function in VHDL?
A function is a subprogram written in VHDL. This program can be called and used in other programs.
What is meaning of Test Benches in VHDL?
After compiling a hardware description language like VHDL, it is required to apply inputs to the program in order to obtain out puts. Applying the inputs involves initial conditions. As the systems designed using VHDL are electronic, the initial conditions plays a vital role. Hence, all these conditions along with the information as to where the input is expected to change from 1 to 0 or 0 to 1 is provided to the VHDL program. This is done in the form of a wave or another VHDL program. These are called VHDL test benches. In other words, test benches are the means of applying inputs to VHDL program.
What is the VHDL code to implement NAND gate in behavioral model?
Below code can implement NAND gate in VHDL. The code is written in behavioral model. Library ieee; use ieee.std_logic_1164.all; Entity gates is port (a,b : in std_logic; c : out std_logic); end gates ; architecture and1 of gates is begin process(a,b) Begin If (a=1 and b=1) then C<='0'; Else C<= '1'; End if; End process; End and1;
Is VHDL text or graphic programmed?
VHDL is a text based programming language.
What is the basics of VHDL?
VHDL is a hardware description language. You can describe the hardware in three different ways using VHDL. 1. dataflow model 2. behavioral model 3. structural model
What is a vhdl gold model?
Vhdl has got three models - programming styles. 1. data flow model 2. behavioral model 3. structural model.
How to implement XOR gate in behavioral model of VHDL?
basic gates like XOR already exist in VHDL.
What is VHDL program for half adder in behavioral model?
PROGRAM:Library ieee;use ieee.std_logic_1164.all;entity ha1 isport(a,b:in bit;s,c:out bit);end ha1;architecture ha1 of ha1 isbegins
What is component initiation in VHDL?
In structural modeling of VHDL, the concept of components is used. In this model, the system to be designed is considered as a combination of sub structures. These sub structures are called components.For example, a full adder is a combination of two half adders and an or gate. Hence, the components used for designing a full adder arehalf adderOR gateInitially, these components are mentioned in the architecture of a full adder VHDL program. We call this as component initiation. Then the components are called onto the main program and used.Remember, we are using the functionality of the components in main program but we are not coding them in the main program. The code for the component programs will be present somewhere else in the project.Means, code them once and use them infinite number of times.
How can you write a VHDL code for full adder using two half adders?
Since a fulladder can be obtained by using 2 halfadders & 1 OR gate.....so we have to call an halfadder program as well as an OR program......this can be implemented easily with the help of structural model rather than dataflow and behavoioural model
What is the VHDL code for half adder dataflow?
Half adder is a combinational circuit which can add two bits. It contains two inputs and two outputs. The same is implemented in entity declaration of VHDL program. The outputs are related to inputs as follows: SUM output is obtained by XORing the inputs and CARRY output is obtained by ANDing the inputs i. e. multiplication. The VHDL code for half adder using data flow model is given below: library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity had is Port ( a : in STD_LOGIC; b : in STD_LOGIC; s : out STD_LOGIC; c : out STD_LOGIC); end had; architecture df of had is begin s<= a xor b; c<= a and b; end df;
Why function in VHDL?
A function is a subprogram written in VHDL. This program can be called and used in other programs.
What is meaning of Test Benches in VHDL?
After compiling a hardware description language like VHDL, it is required to apply inputs to the program in order to obtain out puts. Applying the inputs involves initial conditions. As the systems designed using VHDL are electronic, the initial conditions plays a vital role. Hence, all these conditions along with the information as to where the input is expected to change from 1 to 0 or 0 to 1 is provided to the VHDL program. This is done in the form of a wave or another VHDL program. These are called VHDL test benches. In other words, test benches are the means of applying inputs to VHDL program.
What is the VHDL code to implement NAND gate in behavioral model?
Below code can implement NAND gate in VHDL. The code is written in behavioral model. Library ieee; use ieee.std_logic_1164.all; Entity gates is port (a,b : in std_logic; c : out std_logic); end gates ; architecture and1 of gates is begin process(a,b) Begin If (a=1 and b=1) then C<='0'; Else C<= '1'; End if; End process; End and1;
How do you build 8085 using vhdl?
VHDL is a hardware description language. It describes the functionality of a hardware as a program. If we know the architecture of 8085, the same can be implemented or coded using VHDL.
How vhdl is used?
VHDL is a hardware description language. The purpose of any HDL is to represent hardware as a program. We can write a program (code) for any digital circuit using VHDL. With the help of this code, the output of the circuit can be observed before actually designing it physically.
