This is a question someone else posted this time last year which was never really fully answered (too old to bump).
I have the same exam tomorrow and am experiencing the same problems so if anyone can provide some help on questions 2 or 3 it'd be greatly appreciated!
(http://forum.allaboutcircuits.com/showthread.php?p=144945#post144945):
I have the same exam tomorrow and am experiencing the same problems so if anyone can provide some help on questions 2 or 3 it'd be greatly appreciated!
(http://forum.allaboutcircuits.com/showthread.php?p=144945#post144945):
Ok so I have an exam tomorrow in Digital Logic and I really need a bit of help. I'm looking through a few past exam papers, and I think if I get general solutions to the following questions then I should be ok:
1) What is the difference between a 4-bit binary integer and a 5-bit binary coded decimal (BCD) integer? The book doesn't seem to mention it. The example given in the question is:
Binary integer 1100 converts to the BCD integer 10010
2) I'll just give an example question:
Quote:
IF (x = 1) AND (y = 0)
THEN Q = 0
ELSEIF (x = 1) AND (y = 1)
THEN Q = (Qlast)'......(the compliment of Qlast)
ELSE
Q = (y)'
ENDIF
(a) Derive the draft transition table
(b) Expand the draft transition table to form a total transition table
(c) Convert the total transition table into a primitive flow table
Ok so I know how to convert a transition table into a primitive flow table... but I don't understand how you can get a transition table from the information given. I always thought that a transition table showed the change from one state to another..?
3) I'll give another example question:
Quote:
A gated J-K latch is an asynchronous sequential logic circuit that is unstable when the J,K and G (gate) inputs are all at logic 1.
(a) Derive the transition table and show that this is so, and
(b) How would you overcome this?
Again, I think I'm just getting confused with transition tables here...
So yeah if I could get any help on any of the above examples I'd appreciate it a lot!!