KGP-RISC

A Single-Cycle 32-bit RISC Architecture CPU build using verilog for Artix-7 FPGA. Complete FPGA working project is avaliable in KGP-RISC directory.

Modules

Module	Description
KGP_RISC.v	Top module to control all other modules.
ALU.v	Module to perform arithmetic operations only. Modules used under ALU.v are : 1) Arithmetic_Barrel_Right_Shifter.v, 2) Barrel_Shifter.v, 3) hybrid_adder.v, 4) MUX_2x1.v, 5) twos_complement.v, 6) twos_complement_64.v, 7) Combinational_32x32_Multiplier.v
branch.v	Perform all the logical operations for branching instructions.
assignInputs.v	Module provides modified and appropriate sign extended input to ALU module depending upon OPCODE and FCODE.
InstDecode.v	This module decodes 32-bit instruction input to generate opcode, fcode, rs, rt, imm, shamt, etc.
InstrFetch.v	Gets instruction from Block-RAM (BRAM) using Program Counter (PC) and decides next PC depending upon braching condition.
regBank.v	This module contains 32 32-bit registers that we will use to write our MIPS program. Assignment of registers_name to corresponding register_number in regBank is provided in Instruction_Fromat_and_Decodings.pdf file.
writeAddress.v	This module provides address(register number), data, and control signal for instructions involving register write/update.
intmem.coe	Stores 32-bit program instructions. Used when creating BRAM.
__.tb	Test Bench for corresponding __.v file

Usage Information

• Register $t0 (register number 8 or r[7]) is used to output final result.
• Block RAM 1(blk_mem_gen_v7_3.v) is used to store 32-bit program instructions. This module is generated by Core Generator using intmem.coe .
• Block RAM 2(blk_mem_gen_v7_3b.v) is initialised empty and used as ROM to store input data like array during program execution. This module is also generated by Core Generator.
• Use Target_Code_Generator.ipynb module to generate 32-bit instructions from assembly code. Instructions are generated according to the Instruction Format and Decodings.

NOTE :

• Create Block RAM 1 using core generator first then import all the other __.v and __.tb modules using Add source to your project. Before importing KGP_RISC_ucf.ucf make sure to set KGP_RISC.v as top module.
• blk_mem_gen_v7_3.v and blk_mem_gen_v7_3b.v are just a verilog modules accessing BRAM.

Schematic Diagram

Sample Test File

MIPS Assembly code and corresponding Instruction Memory

Simulation

Linear Search Simulation