Single cycle processor pdf file

Mips singlecycle implementation electrical and computer engineering university of cyprus. A singlecycle mips processor an instruction set architecture is an interface that defines the hardware operations which are available to software. The five classic components of a computer today s topic. An instruction set architecture is an interface that defines the hardware. Verilog code for 16bit single cycle mips processor. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. Single cycle design fetch, decode and execute each. To develop a model of a single cycle processor following the principles as laid out in mips computer architecture to design various instructions given the limitations for an 8bit processor and an 8bit register file. Any instruction set can be implemented in many different.

Single cycle data paths processor uses synchronous logic design a clock. In a multicycle processor, a single alu can be used to update the instruction pointer in the if cycle, perform the operation in the ex cycle, and calculate a necessary memory address in the mem cycle. Mips is an risc processor, which is widely used by many universities in academic courses related to computer. In this project, a 16bit singlecycle mips processor is implemented in verilog hdl. Register file register file consists of 32 registers. Were giving you the data and instruction memories including all the io devices. Designed a single clock cycle mips processor by verilogimplemented basic instructions of lw, sw, beq, bne, add, sub, set less than, jump, etc. Instruction read from memory value written to register file write data to memory read. In lab 2, your group will build a singlecycle processor, like the one described in chapter 5 of cod.

Youll use the register file and alu from the previous lab. The reasons for this are the long cycle times, the wasted resources, and the large. This header file defines manyall of the mips bitsvectors and is useful when completing this assignment. Design of single cycle and pipeline processor stanford computer. Mips singlecycle processor the verilog singlecycle mips module is given in section 7. To develop a model of a single cycle processor following the principles as laid out in mips computer architecture. Were ready to look at an implementation of the mips simplified to contain only. Problem statement in this problem, you will build an unpipelined singlecycle processor similar to the one we discussed extensively in. Datapath consists of the functional units of the processor. Lecture 5 singlecycle datapath and control fsu computer. Program counter, register file, instruction memory, etc.

Two versions of the singlecycle processor implementation for mips are given in patterson and hennessey. The goal of this project is to implement the mips single cycle cpu from activity 06. Singlecycle vs multicycle implementation up to this point, we have considered a design plan that will use a single clock cycle for. Purpose learn how to implement instructions for a cpu. In the multicycle design, the cycle time is determined by the slowest functional unit memory, registers, alu. It is very rare, if not completely unheard of, for a modern processor unit to have a singlecycle design. In the following image, ive drawn a simple mux that allows selecting between the normal chain pc or the. Write to register file 1 input to the register file specifying the number 5 bit wide inputs for the 32 registers 1 i h i fil ih h l b iinput to the register file with the value to be written 32 bit wide ol f i t it. The problem is to design a verilog module that can do the mips instruction. The register file and data memory have explicit write control signals, regwrite and memwrite.

Then, the risc processor is implemented in verilog and verified using xilinx isim. Built basic parts of pc, instruction memory, data memory, alu, registers file. All steps of executing an instruction are done in 1 clock cycle. The objective is to design and implement a single cycle mips computer in verilog that supports mips assembly instructions including. Memoryreference instructions load word lw and store word sw. The risc processor is designed based on its instruction set and harvard type data path structure. For our singlecycle implementation, we use two separate memories, an alu, some extra adders, and lots of. Microprocessor designsingle cycle processors wikibooks. Single cycle processor advantages single cycle per instruction make logic and clock simple disadvantages since instructions take different time to finish, memory and functional unit are not. Microprocessor designmulti cycle processors wikibooks. Reading sources from the register file cycle 3 performing an alu computation cycle 4 reading or writing data memory cycle 5 storing data back to the register file. Method implement the datapath for a subset of the mips instruction set architecture described in the textbook.

I am trying to implement jr jump register instruction support to a singlecycle mips processor. Single cycle processor professor david patterson john lazzaro fall 2004. Multicycle processor single memory unit shared by instructions and memory. A singlecycle mips processor university of washington.

Dlx, a very similar architecture designed by john l. Instruction set architecture isa arvind versus implementation. Multicycle mips processor singlecycle microarchitecture. In this lab, youll complete a singlecycle lc4 processor. In the single cycle processor, the cycle time was determined by the slowest instruction. Designing a single cycle datapath computer systems architecture cs 365 the big picture. Now, connect alu, register file, instruction memory, data memory, control unit and all other hardwires to complete the design. In each cycle, a fraction of the instruction is executed five stages of instruction execution cycle 1. Datapathconsists of the functional units of the processor.