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Vhdl Full Adder

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48 Threads found on edaboard.com: Vhdl Full Adder
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.
Here's vhdl code for a full adder and Half adder: - Jayson
I am having a Halfadder Module... I want to make a full adder by using the Halfadder module... How to implemnt it in vhdl?....
Hi Werner ;-) for a vhdl solution s. Similar Threads below. For schematics use G00GLE, s. this thread.
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
Dear, I need a help in writing a vhdl cobe for a 4bit full-adder regards
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 (...)
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; (...)
Hi can anybody give the idea for desining a 1-bit full adder of behavioral modeelling using case/if ststements
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 ...
Dear, I need a help in writing a vhdl cobe for a 2bit full-adder using 2 half adder regards
howa can i design a full adder ( vhdl) using structural mode and using gates not 2 half adder and 1 or gate
first design four bit adder from one bit adder .then you can design 16bit adder from 4 full adder circuit.the code is available for this module in Xilinx website. Hi Preetam, Thanks a lot for your reply! The 4 bit adder is a pure combinational circuit. It seems that the (...)
Dear. Create a vhdl file fa.vhd to implement a structural model of a 1-*‐bit full adder.
Hi, I have to develop a program on leakage current estimation and reduction in a full adder circuit using vhdl. Please Reply ASAP. Thanks.
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
use your loaf use google
Hello friends.. can you tell me something about designing a up down counter using only half adders (and flip flops) say for 4 bit ? vhdl code would also do ...or a logic diagram or a link....? thanks....
Do you mean 16-bit BCD adder??? If yes see the link below... Its in verilog you can convert it into vhdl ..
could you give some details about this adder because we need it for vhdl design.... thnx....
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
4x4 multiplier can be implemented with a scaling accumulator multiplier which performs multiplication using an iterative shift-add operations. EDIT: check this pdf which contains 4x4 multiplier
I want a full adder programming code in vhdl.How can I get software for vhdl programming.How can i get licence for it. Any HELP plz!!!
Had just a quick question about a vhdl testbench I made. I am testing a full adder (a,b,c_in are my inputs) and wanted to simply test from (0,0,0 to 1,1,1) as to get all possible combinations of inputs. The reason for this project is just a simple start at vhdl/coding in general. Anyway my question is this I have this (...)
this may help u vhdl Tutorial
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 (...)
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 I am having a problem with my vhdl code made for a multiplication of binary numbers. It keeps showing errors that i do not understand. Is there anyone that could give me a hand, so i upload the program? Thank you!
Hi You are welcome to see some free projects and vhdl tips at: vhdl, verilog, design, verification, scripts, ... " Record array in vhdl using free simulator GHDL. record tip A simple guide describing how to print from vhdl code. print tip The importance of stop on fata
This is an odd quirk from vhdl that annoys most verilog users. The solution is to create a signal inside your design, eg "cout_buf" and then assign "cout <= cout_buf;". there are also ways to use a port type of "buffer", but this has other issues when connecting modules, so it is best just to use the extra signal method. I suggest _buf as the su
There arnt any. You have to build your own or get someone elses. vhdl does not containt libraries of specific constructs, just abstracted ideas as different tools and vendors may do things differently.
is there anythin specific.. actually there are lotsa things u can implement. wot did u get with the xilinx's developer's kit.. did u get a general purpose kit? if u had purchased a general purpose kit u can try some programs like half, full adder and subtractor, u can also try the MUX and Demux programs.. which version of xilinx webpack did u ge
hi, i got the same problem too. i want to create 4-to1-package mux to built 16-to-1 mux. i've read some tutorial from quartus but could not find the answer. but i've read from google groups that previous version of quartus did not support the vhdl package. but i'm not sure about the latest version. anyone know how to solve the probs?
I am generating post P&R vhdl file from Leonardo. While compiling it in modelsim error is coming like no default binding for 'ibuf' and 'obuf'. If I generate same file from the Xilinx then it includes simprim and unisim file. But file generated from Leonardo don't include any such file. Pls help me Program is of simple full adder. (...)
As Iouri suggested, the '-' operator in HDL (such as Verilog or vhdl) is easy to use, and usually generates well-optimized logic for your target device. The results will probably be as small and fast as anything you create yourself. What is "FA"?
A delay for output sum might solve. For vhdl ex: sum <= ( a xor b ) afte 5 ns ; carry <= ( a and b ) after 5 ns ;
Hi everyone, I am wondering if it is possible to write a vhdl/verilog code and uses it to generate the schematic and layout so that I can combine it with my own full custom design? For instance, say I am working on a adder. In order to test the adder, I need to layout not only the adder, but the (...)
can anyone help the following assignment? A ripple-carry adder is designed using for-loop construction. The simplest way to describe a ripple-carry adder is to use a chain of 1-bit full-adders (see figure below where 4-bit ripple carry adder is implemented using 1-bit full (...)
hii everyone, I'm new in vhdl and I'm trying to design a modulo generic adder by using ROM. The output for the adder should be (x + y)mod m. I have no idea on how to create it.
Here c_out is a signal and carry is a variable. In vhdl, a signal will be updated with a small delay. So dependent assignments like above will not happen in the same clock cycle. But variable will be updated immediately. For the first clock cycle: c_out(0) <='1'; carry(0) := old value of c_out(0) = '1'; c_out(1) <= '1' xor '1' = '0'; --old va
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 (...)
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 (...)
Hello, im practicing on my exam to come, and im trying an old exam, i did answer two questions but im very unsure wether they are correct or not, since it was a long time since i wrote vhdl. I would appreciate if someone could check those answers and tell me if something is wrong :). a) using vhdl, implement a component for a full (...)
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 (...)
# vsim adder.vhdl # Loading C:/Modeltech_5.7e/win32/../win32aloem/convert_hex2ver.dll # ** Error: (vsim-3193) Load of "C:/Modeltech_5.7e/win32/../win32aloem/convert_hex2ver.dll" failed: File not found. # ** Error: (vsim-PLI-3002) Failed to load PLI object file "C:/Modeltech_5.7e/win32/../win32aloem/convert_hex2ver.dll". # Region: / # ** Error:
have a look there , may be it is within : there is to_float() function . Check entier directory for float package.
Hi, members, I've some interview questions about digital circuit, vhdl and ASIC/FPGA. I think it's a good opportunity for us to discuss these questions. Maybe it's very helpful when we want to seek for jobs in the near future. The following is the first quesion. Interview question #1: What are the different adder circuits you studied? Here is m
Hi, I am looking to design a parallel squarer circuit using vhdl and try optimizing interconnections to see if it can be more efiicient. The design template Im looking to follow is based on this