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Hardware Design Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM COMPUTER HARDWARE INTERVIEW QUESTIONS HARDWARE DESIGN INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

Hardware Design Interview Questions & Answers - Learning Mode

A Hardware design model, allows hardware designers to understand how their components fit into a system architecture and provides to software component designers important information needed for software development and integration. A computer hardware engineer is someone who researches, designs, develops, and tests computer equipment such as chips, circuit boards, or routers.

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Hardware Design Interview Questions & Answers - Learning Mode
Try Hardware Design Interview Questions & Answers - Exam Mode
Question: What are set up time & hold time constraints? What do they signify? Which one is critical for estimating maximum clock frequency of a circuit?

Answer: Suppose your flip-flop is positive edge triggered. time for which data should be stable prior to positive edge clock is called setup time constraint .

Time for which data should be stable after the positive edge of clock is called as hold time constraint.

if any of these constraints are violated then flip-flop will enter in meta stable state, in which we cannot determine the output of flip-flop.

there are two equation:
1. Tcq + Tcomb> Tskew + Thold
2. Tcq + Tcomb< Source: CoolInterview.com
Question: Give a circuit to divide frequency of clock cycle by two

Answer: You can divide the frequency of a clock by just implementing T Flip flop.

Give clock as clock input and tie the T input to logic 1.

Submitted by sanjum bhatia (sanjumbhatia4@yahoo.co.in) Source: CoolInterview.com
Question: Give two ways of converting a two input NAND gate to an inverter.

Answer: One way is shorting the two inputs of the NAND gate and passing the input.

truth table:

A B output
1 1 0
0 0 1

The second way is passing the input to only one input(say A) of the NAND gate.Since the other input(say B) is floating, it is always logic one.

truth table:
A B output
1 1 0
0 1 1 Source: CoolInterview.com
Question: Design a divide-by-3 sequential circuit with 50% duty circle.

Answer: Take a smiths counter with 3 f/f's
that is to say with 6 states(2*3)
now double the i/p clock frequency to the counter
the o/p of the 3rd f/f is divide by 6 of the i/p with 50% duty cycle
so effectively u got divide by 3 freq with 50% duty cycle Source: CoolInterview.com
Question: Give the truth table for a Half Adder. Give a gate level implementation of the same.

Answer: TRUTH TABLE FOR HALF ADDER:

A B SUM CARRY
0 0 0 0
0 1 1 0
1 0 1 0
1 1 0 1

IMPLEMENTATION:

For SUM, The two inputs A and B are given to XOR gate.

For Carry, The two inputs A and B are given to AND gate.

Submitted by BOOTHI RAJ.P ( boothi.palanichamy@wipro.com) Source: CoolInterview.com
Question: What are the different Adder circuits you studied?

Answer: Adders are generally of five types:
1) Ripple Carry Adder:
The Ripple carry adder(RCA) consists of a building block named Half
Adder(HA) which is cascaded to form a Full Adder(FA). These building
blocks HAs and FAs are also the building blocks of all types of
adders.The n full adders are cascaded to form n bit RCA.
The full adder has three input pins(input Ai,input Bi,carryin Ci) and
two output pins(Sum and Ci+1).Its equations are:
Sum=Ai^Bi^Ci
Ci+1=Ai.Bi+Bi.Ci+Ai.CiCoolInterview.com
Question: Explain the working of a binary counter.

Answer:
Question: How do you detect if two 8-bit signals are same?

Answer: XOR each bits of A with B (for eg A[0] xor B[0] ) and
so on. the o/p of 8 xor gates are then given as i/p to
an 8-i/p nor gate. if o/p is 1 then A=B. Source: CoolInterview.com
Question: Given a circuit, draw its exact timing response.

Answer:

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