Table of Contents

## What is a decoder Verilog?

A decoder is a combinational logic circuit that has ‘n’ input signal lines and 2n output lines. In the 2:4 decoder, we have 2 input lines and 4 output lines.

## How many gates are required to design the 3/8 decoder?

From the above Boolean expressions, the implementation of 3 to 8 decoder circuit can be done with the help of three NOT gates & 8-three input AND gates.

**How do you implement a 3/8 decoder?**

A 3 to 8 decoder has three inputs (A, B, C) and eight outputs (D0 to D7). Based on the 3 inputs one of the eight outputs is selected. The truth table for 3 to 8 decoder is shown in the below table. From the truth table, it is seen that only one of eight outputs (D0 to D7) is selected based on three select inputs.

### How many select line enable line will be there in 3 * 8 decoder?

Answer: Total 8 select lines out of which one is selected. Explanation: The 3:8 decoder is also known as binary to octal converter.

### How can we design a decoder?

Once understood the previous issue, you could design your own decoders.

- Step 1: Decoder’s Inputs. In this step, you need to define what you want to do at the beginning of the process and having a clear idea of your project.
- Step 2: Decoder’s Equations.
- Step 3: Decoder’s Diagram.
- 40 Comments.

**How many 3/8 decoders are needed if you are going to a 6 to 64 decoder?**

9

How many 3-to-8 line decoders with an enable input are needed to construct a 6-to-64 line decoder without using any other logic gates? hence required decoders (from fig.) = 9 so ans is ( C) part.

#### How many inputs are required for a 6 to 64 decoder?

The answer is 4. Say the 8 input variables are A,B,C,D,E,F,G,H. Pass C,D,E,F,G,H as inputs to each of the four 6->64 decoders.

#### What is full subtractor?

The full subtractor is a combinational circuit which is used to perform subtraction of three input bits: the minuend , subtrahend , and borrow in . The full subtractor generates two output bits: the difference and borrow out . is set when the previous digit is borrowed from .

**How many 3/8 line decoders with an enable input are needed to construct a 6 64 line decoder without using any other logic gates?**

How many 3-to-8 line decoders with an enable input are needed to construct a 6-to-64 line decoder without using any other logic gates? hence required decoders (from fig.) = 9 so ans is ( C) part.