EIE2105 Digital and Computer Systems
Tutorial 7: Microprocessor Design Basics and Instruction Set Architecture
Q1. Figure Q1a shows part of the memory space of an 8088 system. It is given that the current content of registers DS, SI, AX and BX are, respectively, 10H, 10H, 60H and EF0H.
|
Physical Address
|
Hex data
|
|
1000H
|
01
|
23
|
04
|
05
|
09
|
06
|
10
|
02
|
|
1008H
|
02
|
10
|
24
|
72
|
31
|
00
|
40
|
10
|
|
1010H
:
|
40
|
51
|
64
|
79
|
90
|
A9
|
C4
|
E1
|
|
2000H
|
10
|
11
|
12
|
13
|
14
|
15
|
17
|
16
|
Figure Q1a
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Address
|
Machine code
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Instruction
|
|
CS:0100
|
8B4802
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MOV
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CX, [BX+SI+2]
|
|
CS:0103
|
B425
|
MOV
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AH, 25H
|
|
CS:0105
|
88E0
|
MOV
|
AL, AH
|
|
CS:0107
|
01C8
|
ADD
|
AX, CX
|
Figure Q1b
Trace the assembly language program segment shown in Figure Q1b. Show the contents of registers AX and CX after the execution of each instruction.
Q2. Explain how the bus width of a microprocessor’s address bus and data bus affects the system performance of a computer system.
Q3. A program is compiled to generate the follow executable machine code sequence.
78H 56H 32H 87H 23H 98H 42H 11H 05H …
The program is then loaded to the main memory of an 8086-based computer system starting from address 5000H as shown in Fig.Q3 for being executed.
Fig Q3
Based on the available information, answer the following questions.
(a) What is the logical address of the datum stored in memory location 5002H?
(b) What is the physical address of the datum stored in memory location 5003H?
(c) What is the logical address of the 5th byte of the program (i.e., 23H)?
(d) What is the physical address of the 5th byte of the program?
(e) What is the physical address of the 5th byte of the program before the program is being loaded into the main memory?
(f) Data A is a word in the program and it is stored in memory locations 5006H and 5007H, determine its value.
(g) Compare the life cycle of data A’s logical address and physical address. Which one is longer?
(h) If the microprocessor of the system wants to access data A, which address signal (in value) will be delivered through the address bus? Is it a physical address?
Q4. How does the X86 system know the fetched binary pattern is an instruction or not?
Q5. Fill in the blank with the following keywords:
[mainframe. computer] [secondary storage] [primary storage] [conditional branch]
[register] [server] [grid] [minicomputer] [Control unit] [server] [Application] [instruction]
[registers] [memory] [I/O device] [System] [computer network] [bus] [cluster] [ALU]
[programming language] [general-purpose] [RAM] [operating system]
1. A(n) ________ generally supports more simultaneous users than a(n) ________. Both are designed to support more than one user.
2. A(n) __________ is a storage location implemented in the CPU.
3. The term _______ refers to storage devices, not located in the CPU, that hold instructions and data of currently running programs.
4. A problem-solving procedure that requires executing one or more comparison and branch instructions is called a(n) _________.
5. A(n) ________ is a command to the CPU to perform one processing function on one or more data inputs.
6. The term ________ describes the collection of storage devices that hold large quantities of data for long periods.
7. A(n) __________ is a computer that manages shared resources and allows other computers to access them through a network.
8. The major components ofa CPU are the _______, _______, and _______.
9. Primary storage can also be called _______ and is generally implemented with
__________.
10. A set of instructions that is executed to solve a specific problem is called a(n) _________.
11. A(n) __________ is a group of similar or identical computers, connected by a high-speed network, that cooperate to provide services or run an application.
12. A(n) ___________ is a group of dissimilar computer systems, connected by a high-speed network, that cooperate to provide services or run a shared application.
13. A(n) ___________ consists of computing resources with a Web-based front-end interface to a large collection of computing and data resources.
14. A(n) ___________ is a hardware device that enables a computer to communicate with users or other computers.
15. A CPU is a(n) _________ processor capable of performing many different tasks simply by changing the program.
16. The ________ is the “plumbing” that connects all computer system components.
17. Most programs are written in a(n) ________, such as C or Java, which is then translated into equivalent CPU instructions.