|Sep23-10, 12:34 AM||#1|
Logic Networks/Seven Segment Displays
1. The problem statement, all variables and given/known data
Here's the problem:
Design a logic network that can display the characters in “APPLE” on a sevensegment
display unit. Write the truth table for the output functions C0-C6, minimize them
by using Karnaugh Map, and implement using discrete logic gates.
(Hints: Character “A” will be displayed if segments (C0, C1, C2, C4, C5, C6) of a 7-
segment display are turned on and segment (C3) is turned off. Since only 4 characters
will be displayed, input of 2 bits to encode them will be needed for the given design.)
Now, where I get confused is when it says an input of 2 bits to encode them will be needed. I understand that technically only 2 bits are needed, but I do not understand how to implement it using only 2 instead of 4. I've been searching and thinking of different ways to do it but I am stumped.
2. Relevant equations
Not quite applicable
3. The attempt at a solution
With 2 bits to work with:
00 = A
01 = P
10 = L
11 = E
A B C0 C1 C2 C3 C4 C5 C6 0 0 1 1 1 0 1 1 1 0 1 1 1 0 0 1 1 1 1 0 0 0 0 1 1 1 0 1 1 1 0 0 1 1 1 1
Any help will be greatly appreciated! Thanks
|Sep23-10, 12:39 PM||#2|
Everything you've done looks correct. Now just do the 7 K-maps (or just write the 7 equations) that define the logic that drives the 7-segment displays. The same logic is repeated at each display, and drives the 7 segments based on that 2-bit input AB.
BTW, I edited your post to insert Code tags around your table. This preserves the column alignment.
|Sep24-10, 12:26 AM||#3|
Thanks a million berkeman, I think I got it all figured out!
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