Digital Circuits & Design, 1st Education by Pearson

5.36 | Chapter 5

5.6.3 | Multifunction from Binary Parallel Adder

Parallel four-bit adder can be used to perform following function

(i) To transfer data (data buffer)

(ii) Increment data by 1

(iii) One’s complement of data

(iv) Two’s complement of data

Data transfer: XOR gate can be used to transfer the data because:

xx⊕=0

. Figure 5.44 gives

implementation of the data transfer using XOR gate, when logic 0 (0V) is given instead of

logic 1(+5V).

Inverter: XOR gate can be used to nd 1’s complement because:

xx⊕=1

. Figure 5.44 gives

implementation to nd 1’s complement of data using XOR gate.

Data Transfer using four-bit parallel adder: ...