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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 3 Examinations 2007/
Module Title: DIGITAL SYSTEMS 2
Module Code: ELTR 6006
School: Electrical & Electronic Engineering
Programme Title: Bachelor of Engineering – Applied Electronics Design, Year 1 Bachelor of Engineering – Communications Systems, Year 1 Bachelor of Engineering – Electronic Automation & Robotics, Year 1
Programme Code: EELXE_7_Y EELXN_6_Y
External Examiner(s): Mr. D. Denieffe Dr. P. O’Sullivan
Internal Examiner: Mr J. O’Sullivan
Instructions: Attempt any three questions. All questions carry equal marks. Ensure that you include the Return Sheet with your answer book.
Duration: 2 Hours
Sitting: Autumn 2008
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you are attempting the correct examination paper. If in doubt please contact an Invigilator.
Q1 (a) Figure 1 below shows the logic symbol of a D-type flip-flop. Draw a truth table to describe the action of all inputs and outputs on this circuit. [4 marks]
(b) With the aid of the truth table in (a), complete the timing diagram on the Return Sheet for this circuit. [6 marks]
(c) Some inputs on this circuit are a said to be synchronous and some asynchronous. Explain what this statement means and identify the synchronous and asynchronous inputs on the circuit. [4 marks]
(d) Draw a circuit diagram to show how a number of D-type flip-flops such as those in Figure 1 can be wired up to implement a parallel register circuit capable of storing any 4-bit binary number. [6 marks]
Pre
Clr
D Q
Q
C
Figure 1
Q2 (a) In relation to binary counters, what is meant by synchronous operation? State any advantages that synchronous counters have over their asynchronous equivalents. [5 marks]
(b) Draw a logic diagram and truth table for a synchronous binary counter. [6 marks]
(c) Figure 2 below shows the pinout diagram of the 74LS193 4-bit bi-directional synchronous binary counter chip that was studied in the FACET labs. Draw a functional block diagram of this chip. [4 marks]
(d) Briefly describe the function of all inputs and outputs on this chip. [5 marks]
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8
DOWN UP (^) QC QD
B D
QB QA
A CLEARBORROW CARRY LOAD C
Figure 2
