Are you talking about 7-segment display (digits 0-9)? If so, then you will need more than 3 inputs to get all 10 possible digits.Does anyone know how to build a 3-input/7-output decoder? all segments are also in active high. I have been having some serious trouble with this concept, any help would be greatly appreciated.
I want to build a THREE input to SEVEN output decoder... the truth table above has 7 possible outputs a, b, c, d, e, f, g. The truth table has 3 inputs G0 G1 and G2 (1, 2 an 4 respectively) Is that even possible?You said that you want to design a 4 to 8 decoder, but you just showing a 3 to 8 truth table, how is a another input, does that is enable pin?
Your input G0,G1,G2 and the display number didn't like the normal number as :I want to build a THREE input to SEVEN output decoder... the truth table above has 7 possible outputs a, b, c, d, e, f, g. The truth table has 3 inputs G0 G1 and G2 (1, 2 an 4 respectively) Is that even possible?
Here is the truth table for your customized 7-segment decoder.I have to design a 3 input (g0,g1,g2) decoder with a 7 line output (a to g) to link into a 7 segment display. all the segments of the display are activated on active high. and I have to assume that when 6 and 9 are displayed, the system only displays 5 segments not six. (so segment a in 6 is not active and segment d in 9 is not active)
g2 g1 g0 | a b c d e f g | display
0 0 1 | ? ? ? ? ? ? ? | 1
0 0 0 | ? ? ? ? ? ? ? | 7
0 1 0 | ? ? ? ? ? ? ? | 2
0 1 1 | ? ? ? ? ? ? ? | 4
1 0 0 | ? ? ? ? ? ? ? | 5
1 0 1 | ? ? ? ? ? ? ? | 0
1 1 0 | ? ? ? ? ? ? ? | 3
1 1 1 | ? ? ? ? ? ? ? | 6
I just cant figure out how to construct the logic or manipulate the logic of a 4 to 8 decoder. Ive tried to manipulate a 3 to 8 decoder's logic gates but Im trumped
The first step is to go through row by row and determine whether each question mark needs to be a 0 or a 1. If the segment is supposed to be lit, then it is a 1 since the display segment is active high.I have to design a 3 input (g0,g1,g2) decoder with a 7 line output (a to g) to link into a 7 segment display. all the segments of the display are activated on active high. and I have to assume that when 6 and 9 are displayed, the system only displays 5 segments not six. (so segment a in 6 is not active and segment d in 9 is not active)
g2 g1 g0 | a b c d e f g | display
0 0 1 | ? ? ? ? ? ? ? | 1
0 0 0 | ? ? ? ? ? ? ? | 7
0 1 0 | ? ? ? ? ? ? ? | 2
0 1 1 | ? ? ? ? ? ? ? | 4
1 0 0 | ? ? ? ? ? ? ? | 5
1 0 1 | ? ? ? ? ? ? ? | 0
1 1 0 | ? ? ? ? ? ? ? | 3
1 1 1 | ? ? ? ? ? ? ? | 6
I just cant figure out how to construct the logic or manipulate the logic of a 4 to 8 decoder. Ive tried to manipulate a 3 to 8 decoder's logic gates but Im trumped
Isn't it nice when you find someone willing to do a good part of your homework for you, even if they don't quite read the problem and do it wrong.Here is the truth table for your customized 7-segment decoder.
Now, are you able to design your decoder circuit using discrete logic TTL/CMOS gates?
View attachment 90473
Allen
When you did that, it seems as you already did for him half of his work, since this is a home work, so we can't do too much things for the student, only guiding him.I though that may be if doing the truth table would get him start thinking why are the "1" and "0" are there. If he didn't understand he would start asking questions and me or someone else would slowly guide him. But after seeing post #9, that should give him the "ah ha" moment.
Allen
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