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Second-Term Examination

Fifth Semester [B.Tech] - November 2005

Paper Code : ETEC – 303 Subject : Microprocessor System I

Time : 11/2 Hours

Maximum Marks : 30

Note : Attempt any 3 questions in all. Make suitable assumptions where nessecary.

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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