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How do you implement a full subtractor using a decoder?

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How do you implement a full subtractor using a decoder?

Designing a Full Subtractor-

  1. Step-01: Identify the input and output variables- Input variables = A, B, Bin (either 0 or 1)
  2. Step-02: Draw the truth table- Inputs.
  3. Truth Table.
  4. Step-03: Draw K-maps using the above truth table and determine the simplified Boolean expressions-
  5. Step-04: Draw the logic diagram.

What decoder is needed for full subtractor?

3-8 decoders
The designing of a full subtractor using 3-8 decoders can be done using active low outputs. Let’s assume decoder functioning by using the following logic diagram. The decoder includes three inputs in 3-8 decoders. Based on the truth table, we can write the minterms for the outputs of difference & borrow.

How does a 3×8 decoder work?

A 3 to 8 decoder has three inputs (A,B,C) and eight outputs (DO 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 table (1). From the truth table, it is seen that only one of eight outputs (DO to D7) is selected based on three select inputs.

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Which output circuit is same as full subtractor?

A full subtractor is a combinational circuit that performs subtraction involving three bits, namely A (minuend), B (subtrahend), and Bin (borrow-in) . It accepts three inputs: A (minuend), B (subtrahend) and a Bin (borrow bit) and it produces two outputs: D (difference) and Bout (borrow out).

What is the use of decoder in memory access in computer system design?

An address decoder determines which device communicates with the processor. It uses the Address and MemWrite signals to generate control signals for the rest of the hardware. The ReadData multiplexer selects between memory and the various I/O devices.

Why do we use demultiplexer?

Demultiplexer is used to connect a single source to multiple destinations. The main application area of demultiplexer is communication system, where multiplexers are used. Most of the communication system are bidirectional i.e., they function in both ways (transmitting and receiving signals).

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