LAB 1: Combinational Logic: Designing and Simulation of Arithmetic Logic Unit ALU using VHDL
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1 LAB 1: Combinational Logic: Designing and Simulation of Arithmetic Logic Unit ALU using VHDL Outcome: 1) Identify the operation techniques 2) Demonstrate the use of architecture types 3) Identify and describe the operation of an ALU 4) Develop a simple VHDL program in Altera Quartus II software Introduction Data and signals can be represented in various forms. Previously, we have studied and exercised in Lab 1 that typing an architecture for an entity is by assigning a signal and data to a certain port declared as in a dataflow process. In fact the forms of behavioral written formats can either be concurrent or sequential. Below we will discuss the types of approach that can be used to type a VHDL behavioral approach in the architecture. A VHDL architecture contains a set of concurrent statements. Each statement defines one of the connected block or processes that describe the overall behavior or structure of a design. For a structured statement, we use the port mapping techniques and instantiation declarations as described in Lab 1. When we say concurrent, this means that for each block or process are done and executed continuously. The modeling choices for a behavioral approach can be described as follows: 1. Dataflow Style or concurrent assignment statement 2. Procedural Style or sequential assignment statement Both of these styles are the two main concurrent statements and can either be apart or nested together inside an architecture. Nesting of statements: 1. Concurrent statements inside a concurrent statement 2. Sequential statements inside a concurrent statement 3. Sequential statements inside a sequential statement For the purpose of this lab we will learn some of the modeling techniques commonly used. Concurrent Assignment Statement 1. Simple signal assignments Target <= expression; 2. Conditional signal assignments Target <= {expression WHEN condition ELSE} expression;
2 3. Selected signal assignments With choice_expression select Target <= {expression WHEN choices} expression WHEN choices; Sequential Assignment Statement Done inside a process after the declaration and begininng of the architecture. 1. If statement Process (sensitivity_list, [sensitivity_list]) Begin If condition then Elsif condition then Else End if; End process; 2. Case statement Process (sensitivity_list, [sensitivity_list]) Begin Case (expression) is When (choices) => {When (choices) => } End case; End process; ALU Design Example One essential function of most computers and calculators is the performance of arithmetic operations. These operations are all performed in the Arithmetic Logic Unit or ALU inside the CPU of a computer, where logic gates and registers are combined so that they can add, subtract, multiply and divide binary numbers. Figure 2.1 below illustrates a block diagram of major elements included for a typical ALU. The main purpose of the ALU is to accept binary data that are stored in the memory and to execute arithmetic and logic operations according to instructions from the control unit.
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4 The VHDL model for the above function table can be designed as follows : 1. Open new project in Altera Quartus II software (refer Pre Lab) 2. Write down the VHDL code given above and run the code compilation. 3. Generate the waveform for the simple_alu design and verify the functionality.
5 Task / Assigment : Design an 8 bit Arithmetic Logic Unit (ALU) that could perform the operation list in the table below: OpCode Operation 00 A + B 01 A B 10 A and B 11 A or B Write down the VHDL code and generate the waveform. Verify your work by demonstrate the coding and waveform to Lab Instructor. * You are advice to save your work as you will use back the design later
6 LAB REPORT Cover page Objectives Introduction (describe briefly on ALU less than 200 words) VHDL Model/Coding Results i) Example RTL Viewer Waveform ii) Task/Assignment RTL Viewer Waveforms Discussion i) Discuss the waveform in example (for 4 bit ALU) ii) Discuss the waveform in task/assignment (for 8 bit ALU) Conclusion
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