RISC Processor I/O By Eric Schultz Under Advisement of Dr. Vinod Prasad

Outline What is a processor? What is a RISC processor? What is I/O? Why is I/O important? How will this I/O structure be designed? What progress has been made?

What is a Processor? The processor is part of a computer. It cannot work without supplemental hardware. The processor does all command interpretation. The processor ties all other subsystems together.

A Computer Consists Of: Processor RAM External Cache Graphics Adapter Disk Controller Hard Disk Monitor Keyboard Bus Interface

What is a RISC Processor? There are two types of Processors, CISC and RISC. CISC – Complex Instruction Set –Executes Many tasks with one instruction. –Each Command takes multiple Clock Cycles. RISC – Reduced Instruction Set –Executes One task per instruction –Each Command takes One Clock Cycle.

What is I/O? I/O is the Input/Output facilities of the processor. It provides For the Processors Bus interface. It can provide serial, parallel, and analog interfaces.

Why is I/O Important? I/O allows a processor to communicate with other hardware. Without I/O all activity in the processor would be confined to that one silicon chip.

I/O Design Structure. I/O design Structure is dependant on the processors design structure. We are assuming a three Bus Processor design structure taken from Hill and Peterson’s “Digital Systems – Hardware Organization and design.” Design will be done using VLSI to make a Processor mask.

Three Bus Design

Progress The High level concept diagrams have been completed. High Level Design of both Parallel and Serial I/O is in it’s final stages. Simulation of Parallel and serial I/O design has begun.

I/O Pin Concept Diagram

Basic Serial Port Concept Diagram

What are we doing? We are designing a Processor to fit into a larger system with supporting hardware. We are designing a Reduced Instruction Set Processor. I am designing the I/O hardware for the Processor. All high level design is finished.

RISC Processor I/O Questions? Contact: Eric Schultz Or Dr. Vinod Prasad