Download Digital Systems 2 Examination Paper, Autumn 2012, Cork Institute of Technology and more Exams Digital Systems Design in PDF only on Docsity!
CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn Examinations 2012
Module Title: DIGITAL SYSTEMS 2
Module Code: ELTR
School: Mechanical, Electrical and Process Engineering
Programme Title: Bachelor of Engineering in Electronic Engineering
Programme Code: EELES_8_Y1 EELXE_7_Y
External Examiner(s): Dr A Donnellan Mr I Kennedy
Internal Examiner(s): Mr J O’Sullivan
Instructions: Attempt any three questions. All questions carry equal marks. Ensure to include the Return Sheet with your answer book.
Duration: Two hours
Sitting: Autumn 2012
Requirements for this examination: N/A
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
You are expected to present your material in a neat and clear fashion. Start each question on a new page. Remember that you have plenty of time for this exam – two hours for three questions.
Q1 (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 1 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 1
Q2 (a) Figure 2 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 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 2
CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn Examinations 2012
Module Title: Digital Systems 2
Return Sheet
PRE
CLR
D
Q
Q
C
Timing diagram – Q2(b)
Name: Return this sheet with your answer book
