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Posted By: Girish Patil Member Level: Diamond Posted Date: 31 May 2008
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2006 ICFAI University B.E Database Management System Question paper
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Database Management System
Paper Code : ETCS – 309
Note : Attempt any 3 questions in all. Q1 is compulsory. Each question carries 10 marks.
Time : 11/2 Hours
Maximum Marks : 30
Q1
( a )
The memory space of an 8085A based system consists of one 8Kx8 bit EPROM starting from memory locations 0000H to 1FFFH and 8 RAM chips each of 1Kx4 bits from the location 2000H. Draw the decoding circuit and draw the connection diagram.
3
( b )
Discuss the various mapping techniques used to establish the relationship between the main memory and cache memory blocks. 4
( c ) Consider the memory system with main memory size = 8K blocks; cache memory size = 512 blocks; block size = 8 words. Determine the size of the tag field of the main memory address under the following conditions:
1. Fully associative mapping
2. Direct mapping
3. Set associative memory with 16 blocks per set.
3
Q2
( a )
Discuss the modes in which the Programmable Peripheral Interface device 8255A can be operated.
3
( b )
Determine the 8255 control word to be used when programming the port A as mode1 input port and port B as mode1 output port. INTEA and INTEB should both be enabled and the two unused port C lines should be defined as outputs. Address of the control port is 83H. Draw the Connection diagram and write the initialization routine required.
3
(c) Specify the handshake signals for port B of the 8155 if port B is connected as an input port in interrupt mode. Explain the functioning of each handshake signal. 4
Q3
( a )
Draw the connection diagram to show how the DMA controller 8237 can be interfaced with the 8-bit microprocessor 8085A and list the steps required to accomplish data transfer with the peripheral.
5
( b )
Draw the block diagram of the Programmable Keyboard/Display Interface 8278 and explain its operation. Discuss the format of the keyboard/display mode set command. 5
Q4
Write short notes on :
10
( a )
Cache Controller
3
( b )
DRAM Controller
4
( c )
Programmable Interval Timer, 8254
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