2008年1月18日 · If you connect one of the input lines say x3 (starting from x0) to 0 and use other input lines you get 3:1 mux provided you don't select the x3 line using the combination of 11 on the select line . that can be done using external logic. so to convert 4:1 mux to 3:1 mux its enough if you dont select the extra line using the select combination.

2015年7月18日 · While designing a 3:1 mux we require 2 select lines, but one combination is not useful, say 2'b11. If this combination occurs the output becomes 0 irrespective of the value of input lines. Is not the

2019年11月28日 · I'm trying to understand if it's possible to Implement boolean function with 3 inputs using only mux 4 to 1 and inverter. As far as I understand I can put in the selectors the first 2 variables to ...

2016年8月28日 · EDIT: Yes, we can implement it without using the last 4:1 MUX; but you have to use an OR gate there and also include enable pins for each 4:1 MUX. It utilizes the traditional method; drawing a truth table and then analytically deciding the design. Here is an example of an 8:1 MUX from 2:1 MUX without using a 2:1 MUX at the output.

Furthermore, it should be clear that you can create a 4:1 multiplexer from three 2:1 multiplexers, an 8:1 multiplexer from seven 2:1 multiplexers, and so fourth, by creating a tree topology and wiring the selects appropriately.

2015年2月20日 · Fortunately, that's the same as having three parallel one-bit 3-to-1 multiplexers, for which schematics can easily be found online. For example, bit 0 of digit 0, bit 0 of digit 1, and bit 0 of digit n-1 connect to the three inputs of the first multiplexer, and its output becomes bit 0 of your "display bus". Repeat twice more for bit 1 and bit 2.

2016年4月24日 · A multiplexer is a collection of gates where none are arranged to retain an internal state. A truth table of all possible input combinations can be used to describe such a device. A 2:1 multiplexer has 3 inputs. Therefore a complete truth table has 2^3 or 8 entries.

2016年8月9日 · There's 3 obvious ways I can see to build an 8:1 multiplexer from 4:1 and 2:1 multiplexers. With this information you should be able to finish the other bits off by yourself. However, unless you understand how multiplexers actually work then you won't learn anything. I recommend reading about multiplexers online. Combinational Logic - Multiplexers.

2017年10月9日 · I believe it is simpler to use the 74ls151. This is an 8 to 1 mux. You have 8 inputs that you can select one at a time. So if you apply the 3 A bits to the select pins, the (single) output will "follow" the corresponding (D0 to D7) input level. Since the bits are equal when they are all 0 or 1, this means that the output will follow D0 (000) or ...

2018年6月18日 · c) Your idea of connecting 1 and NOT D input signals to the 3-state buffers though is right. Except your bad truth table makes the result wrong. You also need 0 input for some.