64-Bit Adder: This project contains three different implementations of a 64-Bit Adder module using: ripple-carry adders, 2-bit look ahead adders, and a behavioral design. All source code in Verilog-Projects are released under the MIT license. See LICENSE for details. Can I get the Verilog code for an 8-bit serial adder using a state machine? What is the code for sorting with testbench using Verilog? Do anyone have any idea about design of cognitive radio in VLSI using Verilog code? Design a serial adder circuit using Verilog. The circuit should add two 8-bit numbers, A and B. The result should be stored back into the A register. Use the diagram below to guide you. Hint: Write one module to describe the datapath and a second module to describe the control.
Verilog Full Adder Example
We will continue to learn more examples with Combinational Circuit - this time a full adder. A combinational circuit is one in which the present output is a function of only the present inputs - there is no memory. This is different from the sequential circuits that we will learn later where the present output is a function of not only the present input but also of past inputs/outputs as well. Table: A one bit comparator
Let us look at the source code for the implemmentation of a full adder fulladder.v The important statement to note is the assignment statement assign {cout,A} = cin + y + x; An left side of the assignemnt statement can contain a concatenation of scalar or vector. In this way it is possible in this case to assign the result of the adder to two bit vector. Notice how the vector array is formed using the curly bracket {cout,A}. The rightmost part of the vector {cout,A} , which is A in this case forms the LSB. We will now add a test bench to confirm that the result is as expected. So here goes the test bench. fulladdertb.v As usual we will compile the program with following commands Serial Adder Verilog CodeNotice that we have introduced a system variable $time as one of the parameters in the $monitor statement. This comes handy when looking at the data ( if that is not in graph). The system variable $time returns the current simulation time as a 64-bit integer. Looking back at the code - the vector concatenation thing on the left hand side in the assignment statement Could be replaced by two assignment statements ( looking at the table in the top of the page and writing sum of products. If you look more closely, the full adder circuit can be simplified quite a bit, but will require intelligent mix of Exclusive OR gates when writing term for sum. This will form the basis of one of the exercises below.
1. Redo the full adder with Gate Level modeling. Run the test bench to make sure that you get the correct result. 2. Draw a truth table for full adder and implement the full adder using UDP. 3. Use the waveform viewer so see the result graphically.
Before looking at the solution, make sure you have given your efforts to solve it. Here are the solution codes. ![]() Exercise 1. Extend the full bit adder so that it can add two 2 bit inputs in place of two 1 bit inputs. It will also have a carry in and a carry out.
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Design is a serial adder. It takes 8-bit inputs A and B and adds them in a serial fashion when the goinput is set to 1. The result of the operation is stored in a 9-bit sum register, The block diagram is attached. I am using Quartus II 13.0sp1 (64-bit) Web Edition. https://high-powergeorgia.weebly.com/noten-wo-menschen-sich-vergessen-pdf-editor.html.
Errors:Error (10170): Verilog HDL syntax error at LAB9b.v(56) near text 'â'; expecting ':', or ','i have not written this text 'â' anywhere in the code but still it is sowing me syntax error near 'â' .??
Following is the Code written :- Baca manga kamichama karin bahasa indonesia.
Greg
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Umer Khayyam SattiUmer Khayyam Satti
1 Answer’ is not ' (notice the shape difference). Verilog works with the apostrophe character (' , ASCII 0x27). Your ’ is likely an extended ASCII character. There is also a » character, which I believe should be ! .
I'm guessing you wrote your code in word editor (ex Microsoft Word, LibreOffice Writer, Apple iWork, etc). These kinds of editors tend to swap
' for ’ while you type because it is more visually appealing for humans. Email clients and some messaging apps tend to do this too.
You should always write your code in a plain texted editor or an editor intended for writing code. Emacs and Vim are popular editors for writing code; syntax highlighting plugins are available for both. An IDE, like Eclipse, is another option. Notepad does work as well.
I also noticed you used and GregGreg
assign statement on the reg type temp . This is not legal in verilog. assign statements can only be done on net types (e.g. Brigandine grand edition how to get aldis. wire ). You may have other compiling errors that will show up after fixing ’ and » , the error message will likely be more helpful.The compiler will not flag it, but recommend coding style is to use blocking assignments ( = ) inside combination block (always@(*) ), not non-blocking (<= ).
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