Molex Engineer Trainee Interview Questions and Answers for Experienced

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Q1. Digital design VLSI fabrication question STA
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Q1. Simple behavioral talk
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Questions covering various aspects

Q1. Design a mood 3 counter
Ans. 
A mood 3 counter is a device that tracks and displays the user's mood on a scale of 1-3.
• Design a simple interface with 3 buttons for the user to input their mood (happy, neutral, sad)

• Include a display screen to show the current mood level

• Implement a reset button to clear the mood counter

• Consider adding a visual indicator such as colored LEDs for each mood level
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Q2. What are the three states
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The three states refer to the three fundamental states of matter: solid, liquid, and gas.
• Solid: particles are closely packed together and have a fixed shape and volume (e.g. ice)

• Liquid: particles are close together but can move past each other, taking the shape of their container (e.g. water)

• Gas: particles are far apart and move freely, filling the entire space of their container (e.g. air)
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Q1. Design exor,nand using 2:1 mux Design d latch using 2:1 mux Design frequency divide by 3 circuit
Ans. 
Design exor, nand and d latch using 2:1 mux and frequency divide by 3 circuit
• For exor using 2:1 mux, connect one input to select line and other to output of nand gate using 2:1 mux

• For nand using 2:1 mux, connect one input to select line and other to inverted output of and gate using 2:1 mux

• For d latch using 2:1 mux, connect data input to select line and connect inverted output to one input and output to other input

• For ...read more
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Q1. Explain functional and code coverage.
Ans. 
Functional coverage ensures all functions are tested, while code coverage ensures all lines of code are executed.
• Functional coverage focuses on testing the functionality of the design.

• Code coverage ensures that all lines of code are executed during testing.

• Functional coverage helps in identifying missing or incomplete functionality.

• Code coverage helps in identifying untested code paths.

• Example: Functional coverage may ...read more
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Q1. Questions on AHB protocol.
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Q1. Digital design based questions.
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Q1. Floorplan : How do we calculate number of macros to be added in a block?
Ans. 
Number of macros in a block is calculated based on the size of the block, the size of the macros, and the desired spacing between macros.
• Calculate the area of the block

• Determine the size of the macros

• Calculate the area taken up by each macro

• Divide the block area by the macro area to get the number of macros

• Consider any spacing requirements between macros
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Q2. What is crosstalk? Explain with example.
Ans. 
Crosstalk is the unwanted transfer of signals between communication channels.
• Crosstalk occurs when signals from one channel interfere with signals on another channel.

• It can result in distorted or degraded signal quality.

• Example: In audio systems, crosstalk can cause a faint echo or noise from one channel to be heard in another channel.
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