EE 3755 Homework 3 Due: March 28,2005

Estimated time to solve:

Prob.1 5 mins.

Prob.2 2 mins.

Prob.3 4hours.

Prob.4 2 hours.(check one of the previous homework then it will be 30mins)

Prob.5 3 mins..

Total: From 4hour 40mins to 6hour 10mins.

How to submit? // Hard copy at the class room.

For Problem 2,3,and 4 ,you also have to leave your program on your account.

Please write down actual time you spend to do the each problem.

Use “script “ command to take a snap shot of your program.

After run “script “

Use “cat” command to display contents of your program.

Use “ncverilog” to run your program.

then stop the script.

For Prob.2 to Prob. 4, take a snapshot and submit the snapshot.

Problem 1: Convert the following numbers. (5mins)

Hint (7/8) = 0.875

a) Decimal 12 to 8-bit Binary:

b) Decimal -12 to 8-bit Binary:

c) Decimal 12.875 to Binary (as many bits as needed):

d) Decimal 12.875 to IEEE 754 Single Precision (Show in hexadecimal):

Problem 2 : Show the output of the module.

module behavioral_1(x);

output x;

reg [7:0] x;

initial

// Procedural Code Starts Here

begin

x = 1;

$display("Hello, x=%d, t=%t",x,$time);

x = 2;

$display("Hello, x=%d, t=%t",x,$time);

x = 3;

$display("Hello, x=%d, t=%t",x,$time);

end

endmodule

//Ans.

// Simulator Output

//

module behavioral_2(x);

output x;

reg [7:0] x;

initial

begin

x = 1;

$display("Hello, x=%d, t=%t",x,$time);

#1;

x = 2;

$display("Hello, x=%d, t=%t",x,$time);

#1;

x = 3;

$display("Hello, x=%d, t=%t",x,$time);

#1;

end

endmodule

// Ans.

// Simulator Output

//

Problem 3 : Write a simple Verilog program which will convert

a decimal number to IEEE 754 single format number

and test the solution of problem 1.d.(12.875)//

your program should print 32bit binary number.

Output format should be this:

## start of output

Decimal -10.625 convert to IEEE 754 Single Precision

1100 0001 0010 1010 0000 0000 0000

##end of output

hint:

module test;

real float,float2; // Like a float in C

//1)you also have to declare a data type for the output //here

initial

begin

float = 12.875;

float2 = 12;

$display ("%f\n",float);

$display ("%f\n",float-float2);

i = float;

$display ("%f\n",i);

//

//2)you have to write conversion code here and print

//the result, run the program and get a snapshot of it.

Problem 4 : Write a population count program and a test bench which will generate this following output.

//you have to write a program and take snapshot of it.

//out put solution is following

time input output

100 input a = 00000000000000000000000000000000 output p = 0
 200 input a = 00000000000000000000000000000001 output p = 1
 300 input a = 00000000000000000000000000000010 output p = 1
 400 input a = 00000000000000000000000000000011 output p = 2
 500 input a = 00000000000000000000000000000100 output p = 1
  600 input a = 00000000000000000000000000000101 output p = 2
 700 input a = 00000000000000000000000000000110 output p = 2
 800 input a = 00000000000000000000000000000111 output p = 3
 900 input a = 00000000000000000000000000001000 output p = 1
 1000 input a = 00000000000000000000000000001001 output p = 2
 1100 input a = 00000000000000000000000000001010 output p = 2
 1200 input a = 00000000000000000000000000001011 output p = 3
 1300 input a = 00000000000000000000000000001100 output p = 2
 1400 input a = 00000000000000000000000000001101 output p = 3
 1500 input a = 00000000000000000000000000001110 output p = 3
  1600 input a = 00000000000000000000000000001111 output p = 4

Problem 5 : Answer the sub problems.

5-1)Which code will be longer ? Structural or Implicit ?(Hint : Gates)

(Estimated Time to Finish: 30s.) .

Answer:

5-2)Fill the blanks.( Estimated Time to Finish: 30s.)

a, b	a & b	a && b
000 000
010 111

(Hint:: Arithmetic, logical)

5-3)Fill the blanks; x1 = a == b;

( Estimated Time to Finish: 30s.)

a, b	x1 = a== b
000 000
x01 001

5-4)Fill the blanks x = {a, b};

( Estimated Time to Finish: 30s.)

A, b	x = {a,b};
000 000
001 111

5-5)Fill the blanks x = a >> 2;

( Estimated Time to Finish: 30s.)

A	x = a >> 2
1100
0100

5-6) Write down the value.

//a = 10;

x = a < 12 ? 10 : 20;

What is the x value?(10 or 20).