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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 06 | June 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3197 Design of Low Power 32- Bit RISC Processor using Verilog HDL Surya A Assistant Professor, Department of Electronics and communication Engineering Anjalai Ammal Mahalingam Engineering College, Thiruvarur ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - The RISC or Reduced Instruction Set Computer is a design philosophy thathasbecomeamainstreaminScientificand engineering applications. This paper concerned with the design and implementation of a 32bitReduced InstructionSet Computer (RISC) processor on a Field Programmable Gate Arrays (FPGAs). The idea is to createaRISCprocessorasabuildingblockinVHDL than later easily can be included in a larger design. It will be useful in systems where aproblem iseasytosolveinsoftwarebuthard to solve with control logic. The processor has been designed with Verilog HDL, synthesized using Xilinx ISE 10.1i Webpack, simulated using MODELSIM 6.3f simulator, and then implemented on Xilinx Spartan 3E FPGA. The test bench waveforms for the different parts of the processor are presented and the system architecture is demonstrated. The development approach of the overall system design depends on the design specification, analysis and simulation. The RISC Processor core is high performance 32- bit microprocessor. This processor make it especially suited to embedded control applications. KeyWords: fetch, read.write, power, verilog HDL, xilinx, Modelsim 1. INTRODUCTION RISC processor [Reduced Instruction Set Computer], computer arithmetic-logic unit that uses a minimal instruction set, emphasizing the instructions used most often and optimizing them for the fastest possible execution. Software for RISC processors must handle more operations than traditional CISC [Complex Instruction Set Computer] processors, but RISC processors have advantages in applications that benefit from faster instruction execution, such as engineering and graphics workstations(1) and parallel-processing systems. They are also less costly to design, test, and manufacture. In the mid-1990s RISC processors began to be used in personal computers instead of the CISC processors that had been used since the introduction of the microprocessor. Reduced instruction set computer is a CPU design strategybasedontheinsightthatsimplifiedinstructionscanprovidehigher performance if this simplicity enables much faster execution of each instruction. There are many proposals for a precise definition but the term is slowly being replaced by the more descriptive load-store architecture. 1.1 KEY FEATURES: Uniform instruction format, using a single word with the opcode in the same bit positions in every instruction,demandingless decoding Identical general purpose registers, allowing any register to be used in any context, simplifying compiler design Simple addressing modes. Complex addressing performed via sequences of arithmetic and/or load-store operations. Few data types in hardware, some CISCs have byte string instructions, or support complexnumbers;thisissofarunlikelytobe found on a RISC. Fewer Instructions Fixed instruction length Fixed execution time Lower Cost 2. SYSTEM ARCHITECTURE The RISC processor (2)presented in this paper consists of three components as shown in Figure .1, these components are, the Control Unit (CU), the DataPath, and the ROM. The Central Processing Unit (CPU) has 17 instructions. In the following sections we will describe the design of the three main components of the processor.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 06 | June 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3198 Control unit Datapath unit Memory unit Figure 1. System Architecture 2.1 CONTOL UNIT: The control unit designis based on using FSM(FiniteStateMachine)anddesigneditinwaythatallowseachstatetorun at one clock cycle ,the first state is the reset which is initializes the CPU internal registers and variables. The machine goes to reset state by enabling the reset signal for a certain number of clocks. Following the reset state would be the instruction fetching and decoding states which will enabletheappropriatesignalsforreadinginstructiondatafromtheROM the decoding the part of the instruction. The decoding state will also select the next state depending on the instruction, every instruction has its own state .Based on the instruction ,the control unit select the appropriatestate. After all operationfor given instruction finished, the last state return to fetch state which will allow us to process the next instruction in the program. 2.2 DATAPATH UNIT The datapath consist of subunits that are performing all ofarithmeticandlogicoperations.Itconsistoftheunitsnecessary to perform all the operations on the data selected by the control unit. It consist of register file, ALU, memory interface and branching unit. A datapath is a hardware that performs data processing operations, the control lines coming from the control unit operate all the units in the datapath .The path starts from the register filethathastwooutputportswhichareconnectedto all other units, after that the processing is done by one of the other units thenfinallyreturnedback totheregisterfile inputport using the multiplexer. The signals used in the datapath are forwarded from the control unit to each subcomponents needed. 2.3 MEMORY UNIT The CPU has a built in ROM which enable us to program simple code and execute it. It is a basic 16*32 ROM and itis32bit aligned. The list of signals in the ROMare Address -address sent by the control unity. Data_out - data that is contained the given address. Read - signal to enable reading from the ROM. Ready - signal to indicate when the ROM is ready for reading. Clock -main clock signal.
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 06 | June 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3199 Reset - intial reset signal. 3. SYSTEM DESIGN The processor is based on the Harvard architecture that any instruction occupies separatedpositionsofprogrammemoryand data memory(6)(7). Thus obtaining greater speed and a minor program length, also, the access time to the instructions canbe superposed with one of the data, obtaining a greater speed in each operation(8). The processor includes a RISCinstructionset and uses a Single Instruction – Single Data (SISD) execution order. Figure 2. System Design 4. STAGES OF OPERATION The overall diagram of the processor architecture s shown in figure3. Asseenfromthe diagram,thearchitecture(3) consistsof a five stage of operations. i. Instruction Fetch ii. Instruction Decode iii. Execute iv. Memory v. Write Back Figure 3. Data Flow Diagram 4.1 INSTRUCTION FETCH In this fetch cycle, the instructions are stored in the instruction memory, that instruction is to be fetched from the instruction memory. IR <= MEM[pc] NPC <= pc+4
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 06 | June 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3200 This stage consists of three units.Program Counter, Instruction Memory and Branch Decide Unit. Figure 4. Block Diagram of Fetch Unit 4.2 INSTRUCTION DECODE In this decode stage, instructiondecodeintooperandcodes,operandaddressinformation,control andthedestination operand signal. This stage consists of four units Control Unit, Register Foley-Register and Sign Extend Unit. Figure 5. Block Diagram Of Decode Unit 4.2.1 Control Unit: The control unit generates(4) all the control signals needed to control the coordination among the entire component of the processor. The input to this unit is the 6-bit opcode field of the instruction word. This unitgeneratessignalsthatcontrol all the read and write operations of the Register File, Y-Register, and the Data Memory. It is also responsible for generating signals that decide when to use the multiplier and when to use the ALU, and it also generates appropriatebranchflagsthatareused by the Branch Decide unit. In addition, this unit provides clock gating signals for the ALU Control and the Branch Adder module.
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 06 | June 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3201 Figure 6. Block Diagram of Control Unit 4.3 EXECUTE In this execution stage(5), the data from decode stage is tobeallowedfordata processing operations.This stageconsistsoffour modules: Branch Adder, Multiplier, Arithmetic Logic Unit and ALU Control Unit. Figure 7. Block Diagram Of Execute Unit 5. Instruction Set Architecture: There are three basic types of instructions supported by this processor. Register Type, Branch Type and Immediate Type. The specification for each type of instructions is given below. TABLE 1. Instruction Formats The setting of control lines that are determined by opcode for three instruction formats
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 06 | June 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3202 6. Simulation Results Fetch Output FetchBranch output
7.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 06 | June 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3203 CONTROL UNIT OUTPUT INTEGRATION OUTPUT:
8.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 06 | June 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3204 7. CONCLUSION: The design of 32-bit RISC processor has beenpresented..Herewehaveused nearlytwentyinstructions.Inthatwe have arithmetic operations, logical operations, shift operations and load & store operations. Inour project, weimplementonly 8-bit Wallace tree multiplier and got output successfully. In future, it will enhance into 32-bit. By using MODELSIM 6.3f, the simulation results have been taken for all individual units successfully Most of the goals were achieved and simulationshows that the processor is working perfectly, but the Spartan 2E FPGA was not sufficient for implementing the whole design into a real hardware, since the total available logic gate in Spartan 3 Logic Gate, which was not3. REFERENCES [1] W. Stallings, “organization and architecture of computer,” 7ªEditión, Pearson, 2006. [2] M. Mano, “Architecture of computers,” 3ª Editión, Pearson, 1994. [3] A.K.Ray, “Advanced Microprocessor And Peripherals”, 2nd Edition, Tata McGraw- Hill,2008 [4] D.V.Hall,“Microprocessor And Interfacing”, 2nd Edition, Tata McGraw-Hill,2006 [5] D. Mandalidis, P. Kenterlis, J. Ellinas, “A computer architecture educational system based on a 32-bit RISC processor,” International Review on computers and Software, pp. 114-119, 2008. [6] Tocci, Widmer, Moss, “Sistemas Digitales, Principios y aplicaciones,” 10ª Editión, Pearson, 2007. Antonio H. Zavala, Jorge Avante R.,”RISC- Based Architecture for computer Hardware Introduction”. [7] R. Uma, “Design and Performance Analysis of 8 – bit RISC Processorusing XilinxTool”, International Journal ofEngineering Research and Applications, Volume 2, Issue 2, March – April 2012, pp. 053 – 058, ISSN: 2248 – 9622. [8] N. M. Dyamannavra, N. G. kurahattib,A. Christinaa ,”Design and Implementation of Field Programmable Gate Array Based Baseband Processor for Passive Radio Frequency Identification Tag”, IJE TRANSACTIONS A:BasicsVol.30,No.1,(January 2017) 127-133.
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