Synchronous 3-bit up/down counter

  • Thread starter Hurly
  • Start date
  • #1
19
0

Homework Statement



Design and implement a synchronous 3-bit up/down counter with the following decimal code sequence: 0,1,3,5,7,6,4,2,0,… The counter should count “up” when an UP/DOWN control input Y is 1, and count “down” when the control input is 0.

  • Counting “up”
    decimal: 0,1,3,5,7,6,4,2,0,…
    binary: 000,001,011,101,111,110,100,010,000,…
  • Counting “down”
    decimal: 0,2,4,6,7,5,3,1,0,…
    binary: 000,010,100,110,111,101,011,001,000,…

2. The attempt at a solution

I don't know if the state diagram and Table are right but im having trouble with the flip-flop transition table and the simplified logic expressions for flip-flop inputs. could someone help me out please

imageshack.us/f/822/statediagram2.png/

Picture of state diagrams and state table
 

Answers and Replies

  • #2
19
0
imageshack.us/f/822/statediagram2.png/

Picture of state diagrams and state table
 
  • #3
19
0
Please can anyone help me i have built the circuit in logisim but its not counting to what it was suppose to

its counting 0,4,5,7,6,2,3,0

instead of 0,1,3,5,7,6,4,2,0
 

Related Threads on Synchronous 3-bit up/down counter

Replies
1
Views
3K
Replies
1
Views
2K
Replies
0
Views
3K
Replies
25
Views
9K
Replies
4
Views
9K
  • Last Post
Replies
4
Views
899
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
11
Views
16K
Replies
2
Views
2K
  • Last Post
Replies
4
Views
14K
Top