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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 DCS-II Question paper
Second-Term Examination
Fifth Semester [B.Tech] - November 2006
Q1
( a )
What do you mean by delta delay?
1
( b )
What are generics? Give examples. 2
( c ) Differentiate between constants and variables? 2
( d ) Write down a signal assignment statement (using the concatenation operator &) that creates a rotate right operation by 7 bit positions on the following signal:
SIGNAL m : std_logic_vector(12 downto 0); 2
( e ) What is the main function performed by OLMC's? 3
Q2
( a )
What are signal drivers? What is the effect of transport delay and inertial delay on the signal drivers?
6
( b )
What are the types of object declarations used in VHDL?
4
Q3
( a )
Given the following entity declaration of a 2-to-4 decoder with an enable signal
ENTITY decoder IS
PORT(a, b, g: IN std_logic;
y: OUT std_logic_vector(3 DOWNTO 0));
END decoder;
Write down two architecture descriptions using
1. a selected signal assignment
2. a conditional signal assignment
4
( b )
What is the general expression for case statement? 2
( c ) Implement BCD to gray code converter using PLA? 4
Q4
Write short notes on :
10
( a )
DRAM interfacing
( b )
Sequential PLD's
( c )
Configuration specification
( d ) VHDL simulation phases
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