Hello!
This is my first post on these forums and I'm not entirely sure if it will be my last. I'm in an Computer architecture course [since I'm in IT it's mandatory] anyways, our teacher isn't a very good one, and we don't have a textbook. We were given an assignemnt last week which is due today, and I've been crazily searching the internet for things to help me!
TBH she hasn't taught us about multiplexers or truth tables, and so far all I know is what I'm learned off of google. Our whole class is having problems with these questions and I was hoping someone would have figured it out by now - no luck!
I'm just looking for someone to help explain how I am supposed to draw multiplexers. I saw on wiki that it kind of gives an explanation, but I didn't quite understand it. So far I have 18 inputs draw to 18 AND symbols and then the output of those AND to an OR, I basicall need help understand how to draw and connect the selectors
This is the question in case I misinterpretted it.
(3.a) If there are 18 input bits, and 1 output bit, how many bits are
needed for the selection signal?
(3.b) Design a circuit that multiplexes 18 input bits (x0, x1, …, x17) to 1
output (y0) using the number of selection bits (SEL) from the answer
of (3.a). It is required that the output:
y0 = xi if SEL = i where i <= 18, and
y0 = 0 if SEL = x0 where i > 17.
Namely, if the SEL selects an input larger than 17, then the first input
x0 is used. You are allowed to use the 4-bit multiplexers and logic
gates if needed.
From what I've learned so far, Iwould need five selectors as 2^4 is 16, which would be the max input for 4 selectors.
Any help or websites or anything to drawing this would be great. It is due today and I'm obviously not expecting a miracle.
Thanks so much!
This is my first post on these forums and I'm not entirely sure if it will be my last. I'm in an Computer architecture course [since I'm in IT it's mandatory] anyways, our teacher isn't a very good one, and we don't have a textbook. We were given an assignemnt last week which is due today, and I've been crazily searching the internet for things to help me!
TBH she hasn't taught us about multiplexers or truth tables, and so far all I know is what I'm learned off of google. Our whole class is having problems with these questions and I was hoping someone would have figured it out by now - no luck!
I'm just looking for someone to help explain how I am supposed to draw multiplexers. I saw on wiki that it kind of gives an explanation, but I didn't quite understand it. So far I have 18 inputs draw to 18 AND symbols and then the output of those AND to an OR, I basicall need help understand how to draw and connect the selectors
This is the question in case I misinterpretted it.
(3.a) If there are 18 input bits, and 1 output bit, how many bits are
needed for the selection signal?
(3.b) Design a circuit that multiplexes 18 input bits (x0, x1, …, x17) to 1
output (y0) using the number of selection bits (SEL) from the answer
of (3.a). It is required that the output:
y0 = xi if SEL = i where i <= 18, and
y0 = 0 if SEL = x0 where i > 17.
Namely, if the SEL selects an input larger than 17, then the first input
x0 is used. You are allowed to use the 4-bit multiplexers and logic
gates if needed.
From what I've learned so far, Iwould need five selectors as 2^4 is 16, which would be the max input for 4 selectors.
Any help or websites or anything to drawing this would be great. It is due today and I'm obviously not expecting a miracle.
Thanks so much!
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