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Design of 2 to 12 Counter

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Date Posted: 4/27/2008 4:42:10 AM  Status: Live
Design of 2 to 12 Counter
Course Textbook Chapter Problem
Digital Circuits Digital Design (3rd) by Mano N/A N/A
Question Details:
The problem is to design a counter which runs from 2 to 12 using D-flip-flop. My doubt was whether to consider the unused state as dont care or to link to next state, meaning self correcting.When i make it as self correcting there are too many expressions.Could any one sujjest ways to reduce the expression.

Answers:

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(Cramster SME)
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Date Posted: 5/16/2008 3:59:31 AM  Status: Live
Asker's Rating: None Provided    Moderator's Rating: N/A
Response:
According to the given data we have to design a counter which will count from 0 to 12.
We have to design this counter using D-flip flops
State Table for this counter is as below:
 
Present State     Next State
A
B
C
D
 
A
B
C
D
 
DA
DB
DC
DD
0
0
1
0
 
0
0
1
1
 
0
0
1
1
0
0
1
1
 
0
1
0
0
 
0
1
0
0
0
1
0
0
 
0
1
0
1
 
0
1
0
1
0
1
0
1
 
0
1
1
0
 
0
1
1
0
0
1
1
0
 
0
1
1
1
 
0
1
1
1
0
1
1
1
 
1
0
0
0
 
1
0
0
0
1
0
0
0
 
1
0
0
1
 
1
0
0
1
1
0
0
1
 
1
0
1
0
 
1
0
1
0
1
0
1
0
 
1
0
1
1
 
1
0
1
1
1
0
1
1
 
1
1
0
0
 
1
1
0
0
1
1
0
0
 
0
0
1
0
 
0
0
1
0

For designing of this counter we have to also consider the unused sates 0000, 0001, 1101, 1110 and 1111.
 
I hope this helps you......................

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Karma Points: 3
Date Posted: 6/1/2008 6:42:45 PM  Status: Live
Asker's Rating: Somewhat Helpful   
Response:
wilsonbat's Comment:
It would be grt if u could mention the IC number .......



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