NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
MARCH/APRIL 2015 EXAMINATION

COURSE CODE:                                                                              CIT 344                                                                               

COURSE TITLE:                                                                             Introduction to Computer Design

DURATION:                                                                                     3 Hours

INSTRUCTIONS:                                                                            Answer any Five (5) Questions

 

1a.       Give a brief explanation of how sequential circuits are implemented, using a well-labelled block diagram to illustrate this.     8 marks

1b.       Distinguish between the two (2) common types of sequential circuits                              6 marks

                                                                                                                                              [Total = 14 marks]

 

2a.       Find the sum of two 2-digit BCD numbers, 42 and 31. Your result should be in BCD.     8 marks

2b.       specify the procedure required to save a program that is already stored on memory in Assembly Language                                                                                                                       8 marks

                                                                                                                                              [Total = 14 marks]

 

3.         Go through the table below and answer the questions that follow:

 

Input

 

Output

 

S

 

R

 

Qt + 1

 

0

 

0

 

Invalid

 

0

 

1

 

1

 

1

 

0

 

0

 

1

 

1

 

Qt

 

3a.       Specify what this depicts.                                                                                                         4 marks

3b.       Write the full-meaning S-R in the context of NAND-based latches                                     4 marks

3c.       Give the value of the output Q, when S = 0, R = 1                                                                 6 marks

                                                                                                                                             [Total = 14 marks]

 

 

4.         Microprocessors normally execute programs which include operating systems and user application. List and describe the internal components of a typical microprocessor.                                                                                                                                                        [Total = 14 marks]

 

5a.       Name the four (4) forms of notations that can be used to capture the behaviour of

finite-state machines                                                                                                                 4 marks

5b.       Write short notes on the following:

  1. Memory Read Operation                                                                                              4 marks
  2. Data Signals                                                                                                                   3 marks
  3. Read/Write signals                                                                                                       3 marks

 

6a.       If gbx contains 1000h and esi contains 5, specify the function of the following instruction: mov al, 8[gbx][esi*5]    5 marks

6b.       Write the standard format for assembly language statements in a typical source file.                6 marks

6c.       Name each of the fields in the statements you have provided.                                           4 marks

                                                                                                                                              [Total = 14 marks]

 

7a.       List and describe the three main forms of flash memory operations.                             12 marks

7b.       Write down the instruction required to move data from one segment of a register ‘ecx’ to another ‘edx’.                                                                                                                           2 marks

                                                                                                                                              [Total = 14 marks]


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