# Counter Circuit With A Control Input Design Problem

Discussion in 'Homework Help' started by thefunk, Jan 13, 2008.

1. ### thefunk Thread Starter New Member

Jan 13, 2008
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0
hi,
my question is like that design a counter circuit with a control input ( in addition to the clock input ) that counts odd numbers when the control input is high and counts even numbers when the control input is low.

i have the state tables and k-maps, but i couldn't design the circuit. i'm hopeless, i have to send my report till 4 pm..

2. ### hgmjr Moderator

Jan 28, 2005
9,030
214
Say you have a 4 bit binary number.

Consider what bit in the 4-bit number is the same for all odd numbers and what bit in the 4-bit number is the same for all even numbers.

hgmjr

3. ### thefunk Thread Starter New Member

Jan 13, 2008
3
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3-bit 000 to 111

4. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
Which bit determines odd/even? Spot this and you should be able to get started.

Dec 27, 2007
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6. ### thefunk Thread Starter New Member

Jan 13, 2008
3
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when the control input is high (1) the circiut counts odd numbers,when the control input is low (0) the circuit counts even numbers.

i designed before an odd number counter. Inout is provided by the clock. but here the control input is bothering me

7. ### hgmjr Moderator

Jan 28, 2005
9,030
214
FSM stands for Finite State Machine in scubasteve_911's reply.

hgmjr