Question

2.What is the purpose of having an “overflow” flag?

3.Explain the difference between the C and V flags

4.Why is addition and subtraction so important in digital design?

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6.Why would modular design be so important in creating large, complex designs?

Answer 1

2. overflow falg sometimes called as (v- flag) is generally a single bit in system status register used to indicate the arithmetic flow occurred in an operation. It indicates that the result would not fit in the number of bits used for the operation (i.e., ALU Width).

3. Both c and v flags are generally one and the same indicating that the result would not fit in the space available for the arithmetic operation. Carry flag(c flag) is used when you have somewhere else to put it, else we use the overflow flag(v flag).

4. we know that code systems can store and manipulate information. The arithmetic operations are the basic mathematical operations. All the algebraic operations can be performed only using the arithmetic operations. Addition and Subtraction are very important in the digital designing as all other arithmetic, logical and algebraic operations are based on the addition and subtraction only. For example, binary multiplication can be done using addition and binary division can be done using subtraction.

6. large and complex designs might consist of recurring functions and many modules which might raise confusion during the verification and even during development. Modular design might result in developing small code for each module where it would be easy for reference and verification and also can be used for reusing the same code wherever required.