Control unit design

57 %
43 %
Information about Control unit design

Published on October 9, 2014

Author: ShubhamShah001



Software Unit Design,Computer organization & Architecture

1. Fig. Control unit organization

2. In the hardwired organization control unit is designed as a combinational circuit. The control unit is applied by gates, flip-flops, decoder and other digital circuits. Hardwired control units can be optimised for fast operations. Block diagram of control unit is displayed in Figure below. Major inputs to circuit are instruction register, clock, and flags. Control unit uses the opcode of instruction stored in IR register to perform various actions for various instructions.

3. The Control unit logic has unique logic input for every opcode. It simplifies the control logic. This control line selection can be executed by a decoder. A decoder will have n binary inputs and 2n binary outputs. Every one of these 2n different input patterns will trigger a single unique output line. Clock part of the control unit issues a repetitive sequence of pulses of single state duration for each micro-operation(s).

4. The required control signals are determined by 1) content of control step counter or time generation 2) content of instruction register 3)Content of condition code flags

5. Fig. A control unit and its input-output

6. The four groups of control signals distinguished in fig. have following functions Cin’ – to indicate occurrences of unusual conditions such as errors. Cin’’ , Cout’’– these signals received from other control units eg. Supervisory controller. Both are primarily used to synchronize the control unit with the operation of other units.

7. State table method Delay element method Sequence counter method

8. The Behavior of control unit is designed in the form of state table as shown in fig..

9. The different parts of a flowchart are handled as follows: 1) Between two successive steps simply a D Flip-Flop is inserted.

10. A simple delay element for synchronous control circuits

Add a comment

Related presentations

Speaker: Matt Stine Developing for the Cloud Track Marc Andressen has famou...

This presentation explains how to develop a Web API in Java using (JAX-RS or Restl...

1 App,

1 App,

November 10, 2014

How to bring innovation to your organization by streamlining the deployment proces...

Cisco Call-control solutions can handle voice, video and data

Nathan Sharp of Siemens Energy recently spoke at the SAP Project Management in Atl...

Related pages

Control unit - Wikipedia, the free encyclopedia

The control unit (CU) is a component ... In modern computer designs, the control unit is typically an ... Hardwired control unit. Hardwired control units ...
Read more

Control Unit Design Organization Chapter 05: Basic ...

Lesson 01: Basic Processing Units Chapter 05: Basic Processing Units … Control Unit Design Organization
Read more

Control Unit - University of Washington

Chapter 16 Control Unit Implemntation A Basic Computer Model Example Simple Processor & Data Paths MIPS Data Paths with Generation of Control Signals A ...
Read more


unit-iii control unit design introduction control transfer fetch cycle instruction interpretation and execution hardwired control microprogrammed control
Read more

control unit design - YouTube

Lecture 26 - Memory Controllers & Scheduling - Carnegie Mellon - Computer Architecture 2013 - Duration: 1:27:58. Carnegie Mellon Computer ...
Read more

Control Unit Design - Course Website Directory

Lecture 2 Control Unit Design High-level view of the LC-3b processor As its name implies, the control unit controls the operation of the data path by
Read more

Design of Control Unit: - NPTEL

Title: Design of Control Unit: Author: nptel Last modified by: Manoj Kumar Barma Created Date: 10/20/2006 10:32:00 AM Company: IITG Other titles: Design of ...
Read more

What is a Control Unit (CU)? - Definition from Techopedia

Control Unit CU Definition - A control unit (CU) handles all processor control signals. It directs all input and output flow, fetches code for...
Read more

Electronic control unit - Wikipedia, the free encyclopedia

In automotive electronics, Electronic Control Unit (ECU) is a generic term for any embedded system that controls one or more of the electrical system or ...
Read more