Chapter 8. Tasks and Functions
8.5 Exercises
1. Define a function to calculate the factorial of a 4-bit number. The output is a 32-bit value. Invoke the function by using stimulus and check results.
my answer:
# Factorial of 4 is 3628800
2. Define a function to multiply two 4-bit numbers a and b. The output is an 8-bit value. Invoke the function by using stimulus and check results.
my answer:
# a x b= 150
3. Define a function to design an 8-function ALU that takes two 4-bit numbers a and b and computes a 5-bit result out based on a 3-bit select signal. Ignore overflow or underflow bits.
|
Select Signal |
Function Output |
|
3’b000 |
a |
|
3’b001 |
a+b |
|
3’b010 |
a-b |
|
3’b011 |
a/b |
|
3’b100 |
a%b |
|
3’b101 |
a<<1 |
|
3’b110 |
a>>1 |
|
3’b111 |
(a>b) |
my answer:
4. Define a task to compute the factorial of 4-bit number. The output is a 32-bit value. The result is assigned to the output after a delay of 10 time units.
my answer:
5. Define a task to compute even parity of a 16-bit number. The result is a 1-bit value that is assigned to the output after three positive edges of clock.(Hint: Use a repeat loop in the task).
my answer:
6. Using named events, tasks, and functions, design the traffic signal controller .
my answer: