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fall 2016 ASSIGNMENT
PROGRAM MCA
SEMESTER FOURTH
SUBJECT CODE & NAME MCA4010-
MICROPROSESSOR
CREDIT 4 BK ID B1778 MAX. MARKS 60
Q1. Write short notes on:
a) Central Processing Unit
b) Memory Unit 5+5
Answer:
Central Processing Unit:
The central processing unit (CPU) is the electronic brain of
the computer. CPU consists of Arithmetic Logic Unit (ALU) and Control Unit
(CU).
(I)
Arithmetic Logic Unit
(ALU): The arithmetic logic unit (ALU) is
responsible for arithmetic and logical operations. Basically an
Arithmetic-Logic Unit (ALU) is an electronic circuit used to carry out the
arithmetic operations like addition, subtraction, multiplication and division.
2 Write
short notes on:
a) Bus
Interface Unit (BIU)
b)
Execution Unit (EU) 5+5 10
Answer:
A)
Bus Interface Unit (BIU): The BIU
handles all the data and address on the buses for the execution unit (EU). It
performs all bus operations such as instruction fetching, reading and writing
operands for memory and calculating the addresses of the memory operands. The
instruction bytes are transferred to the instruction queue. Execution unit use
the instruction queue to execute the instructions. Both BIU and EU work
asynchronously to execute instructions by using Pipelining
3 Write
short notes on:
a) REP
Prefix
b)
Table Translation 5+5 10
Answer:
A)
REP Prefix
Because string operations
inherently involve looping, the 8086 machine language includes a prefix that
considerably simplifies the use of string primitives with loops. This prefix
has the machine code
1 1 1 1 10 0 1 Z
where, for the CMPS and SCAS
primitives, the Z bit helps control the loop. By prefixing MOVS, L
4
Describe about Key-code Data Formats and FIFO Status Word formats. 5+5 10
Answer:
Key-code Data Formats:
After a valid Key closure, the key code is entered as a byte
code into the FIFO RAM, in the following format, in scanned keyboard mode. The
Key code format contains 3-bit contents of the internal row counter, 3-bit
contents of the column counter and status of the SHIFT and CNTL Keys The data
format of the Key code
5 Write
a note on
(a) RS
232 standard
(b) IEEE 488 standard 5+5 10
Answer:
A) RS232 Standard
RS232 standard is developed by the Electronic Industry
Association (EIA) in 1962 and was revised and renamed as RS232C. RS stands for
"recommended standard." This is a standard hardware interface used
for
6 Write
short note on:
a)
Parallel Printer Interface (LPT)
b)
Universal Serial Bus (USB) 5+5 10
Answer:
A)
Parallel Printer Interface
(LPT)
The parallel printer interface
(LPT) is located on the rear panel of the PC. The LPT stands for line printer.
The Parallel Port Interface on the PC compatible computer is one of the most
flexible interfaces for connecting the PC to a wide range of devices. The
interface was originally intended purely for connection to printers but due to
the simple nature of the digital control lines it has found many other uses.
Its simplicity relies on the fact that the data to and from the port forms an 8
bit binary on/off
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