Tagged Questions

2
votes
2answers
141 views

Multiplexing large LED matrix

I have a project which involves building a 64 x 48 (3072) LED matrix driven by a Raspberry PI computer. I am a first-year computer engineering student so I am still inexperienced with shift registers ...
1
vote
1answer
83 views

Finding the no. of decoders required in cascading

I am trying to solve the following question. How many 3 to 8 decoders with an enable input are needed to construct a 6 to 64 line decoder without using any other logic gate. I have a Digital ...
2
votes
2answers
709 views

What is the minimum number of NOR gates needed to implement a 2-input multiplexer?

In the first chapter of The Elements of Computing Systems, the reader is asked to implement basic logic gates like Not, And, Or, Xor, as well as a 2-input multiplexer and de-multiplexer. The authors ...
5
votes
2answers
732 views

Multiplexing 2 digit 7Segment with one Bit

I want to control a 2 digit 7-segment LED with a MSP430 micro controller. The display has 8 input pins per digit (8th pin is the dot, which I do not need) and two ground pins (common cathode). The ...
0
votes
3answers
458 views

Anyone know of a 2-1 mux chip?

I'm trying to find an IC implementing 2-1 multiplexers, but I could only seem to find chips like this: SN54LVC157A - Quadruple 2-line to 1-line data selectors/multiplexers. Where there are 2 groups ...
0
votes
3answers
232 views

Help understanding universal logic

just started my comp. architecture course and im trying to figure out universal logic, using multiplexors to represent logic blocks. I found this one example how to use a 2:1 multiplexor to represent ...
0
votes
1answer
562 views

Boolean majority function

In this picture is an example of a boolean majority function (may be a bad example) So the rule says that the result or an output of a majority logic function would be a selection of majority ...
2
votes
1answer
2k views

How can I construct an 8 x 1 multiplexer from two 4 x 1 multiplexers with enable inputs?

I've thought about this problem for two days, and I can't figure out the trick. It would be easy with an inverter and an OR gate, but I was told not to use anything but muxes and wires. I figured out ...
2
votes
2answers
361 views

How does an 8-4 multiplexer function?

I understand the concept of a multiplexer and I can understand how n-1 multiplexers function. Your just sending a select signal to tell the multiplexer which of the inputs at the input pins to let ...