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Vhdl Full Adder

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28 Threads found on Vhdl Full Adder
If you're going to use addition just for the carries, why not go the whole hog and just make your life easy and use + for the whole adder? library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; entity full_adder_12bit is port ( a : in unsigned(11 downto 0); b : in unsigned(11 downto 0); c : out unsigned(1
This is an issue to do with loops and the quirks of vhdl. When you use a signal inside a for or while loop in vhdl, it has no idea which bits are driven and are not driven in C (age old locally/globally static issues). So it assumes All bits of C are driven from inside the process, even though you know they're not. So C(0) gets driven from inside
In vhdl, an adder is "+", two input vector of 16bits added together provides a 17bits output, you need to add saturation behind, that's it.
Hi, Can anyone direct me to the vhdl library for a half adder, full adder and a carry-look-ahead adder please? (CLA with 9-bits) Or in any other case, a suggestion for designing them. Thanks,
Hi, I have to develop a program on leakage current estimation and reduction in a full adder circuit using vhdl. Please Reply ASAP. Thanks.
Hello Dear I want to use some arithmetic operations such as (+,_,*) in my design. The design is fix point. Could you please tell me, If I use (+,_,*) symbols in my vhdl code, is it synthesize correctly or not? Or I need to design the units ( n_bit full adder, for instance) then write the code structurally. ( consider it that, I don't start (...)
hello i need help for my code in test bench .. the code is use IEEE.STD_LOGIC_1164.ALL; entity ff_vhdl is Port(a,b : in std_logic_vector(3 downto 0); cin : in std_logic; s: out std_logic_vector(3 downto 0); cout : out std_logic); end ff_vhdl; architecture structural of ff_vhdl is component (...)
Hi all, I am using TetraMAX to generate test patterns for a full adder code. The problem is at the stage "Write Patterns", Synopsys no longer let us the patterns in Verilog or vhdl, you will receive the error "write_patterns -format verilog_single_file is obsolete; command ignored". I can only save as STIL, binary....But I want to have a (...)
Hi, I try to read but it seem like I can't understand it clearly. Can roughly what does each lines does? Of course I can, but you won't be any wiser compare the schematics of the full adder on wikipedia with what has been coded. Maybe you'll find some similarities. As such you will probably understand it. 2nd
Hi to all, i'm studying the vhdl language, and i'm trying to do some exercise! i did a simple full adder, it works, i have already test it, and with the same criteria i did a ripple carry adder at 8 bits,but i have a problem with the simulation, the error is: # Loading work.rcatb(tb) # ** Warning: (vsim-3473) Component (...)
Just write vhdl code based on truth table.
Dear, I need a help in writing a vhdl cobe for a 2bit full-adder using 2 half adder regards
You can download the Xilinx Webpack for free here: Xilinx: Downloads A fulladder vhdl code looks like this: -- This is just to make a reference to some common things needed. LIBRARY IEEE; use IEEE.STD_LOGIC_1164.ALL; -- We declare the 1-bit adder with the inputs and outputs -- shown in
Hello every one i need your help in vhdl . actually i need a code to design a full adder using a Decoder .. and thank you for such great forum ...
Hi can anybody give the idea for desining a 1-bit full adder of behavioral modeelling using case/if ststements
i have just learned to write on vhdl and I have completed my first full adder code using components for the xor, and, or gates but im not sure if its right, could someone please tell me if this is right? I do not have vhdl ive written this on notepad.. -- For XOR gates: library IEEE; use IEEE.std_logic_1164.all; (...)
Hii I am having a problem with a test bench in vhdl the following is my code for a full adder:: library IEEE; use IEEE.STD_LOGIC_1164.ALL; use ieee.numeric_std.all; entity adderwa is generic (n:positive:=4); port(a,b:in std_logic_vector(n-1 downto 0); cin:in std_logic; sum:out std_logic_vector(n-1 downto (...)
Refer book to understand design and test bench writing : Hdl Chip Design: A Practical Guide for Designing, Synthesizing & Simulating Asics & Fpgas Using vhdl or Verilog by Douglas J. Smith Also below link is useful
could you give some details about this adder because we need it for vhdl design.... thnx....
any code available ?? on vhdl and also tutorial points will be given....... ty in advance
Dear, I need a help in writing a vhdl cobe for a 4bit full-adder regards
you can use the common "+" statement to indicate it is a plus operation, and use according synopsys directive statement in your vhdl comment, then DC will call the DesignWare library cell to do it
I am having a Halfadder Module... I want to make a full adder by using the Halfadder module... How to implemnt it in vhdl?....
use your loaf use google
in vhdl sum <= a xor b xor carry_in; -- each is 1 bit carry_out <= (a AND b) OR (a AND carry_in) OR (b AND carry_in); -- either 2 of the input is 1 then there is a carry out we need bout 7 basic logic gates... how many gates required to build the decoder? is it cost effective? i wonder is it better way to use decoder as multiplier so no
Here's vhdl code for a full adder and Half adder: - Jayson
if you use a programmable logic and you use vhdl or verilog you must define a vector of 9 bits. when you add you 3 8 bits you have the carry gratis. bye. G.