Pipelined 8-bit RISC processor design using Verilog HDL on FPGA

This article describes an 8-bit RISC processor design using Verilog Hardware Description Language (HDL) on FPGA board. The proposed processor is designed using Harvard architecture, having separate instruction and data memory. The salient feature of proposed processor is pipelining, used for improving performance, such that on every clock cycle one instruction will be executed. Another important feature is that instruction set contains only 34 instructions, which is very simple, easy to learn and compact. The proposed processor has 8-bit ALU, Two 8-bit I/O ports, serial-in/serial-out ports, Eight 8-bit general-purpose registers, 4-bit flag register and priority based three vectored interrupts. Another advantage of the proposed processor is that it can execute programs with up to 262,144 instructions long, such that any practical programs can be fitted into it. The proposed processor is physically verified on Xilinx Spartan 3E Starter Board FPGA with 0.0517μs instruction cycle.