InSemi Technology Services Interview Questions, Process, and Tips

Q1. About PCIe protocal
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Q2. 4x4 matrix representation with diagonal elements are 5 multiples
Ans. 
A 4x4 matrix with diagonal elements as multiples of 5.
• Diagonal elements: [5, 10, 15, 20]

• Non-diagonal elements can be any value

• Example matrix: [[5, 2, 3, 4], [1, 10, 6, 7], [8, 9, 15, 11], [12, 13, 14, 20]]
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Q1. Test bench environment for fifo
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Test bench environment for FIFO involves creating stimuli to test the functionality of a FIFO design.
• Create stimulus to write data into the FIFO

• Create stimulus to read data from the FIFO

• Implement checks to verify data integrity and order

• Randomize data inputs to test different scenarios

• Monitor FIFO status signals for debugging
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Q2. Types of transitions in pcie
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There are three types of transitions in PCIe: TLP (Transaction Layer Packet) Data, TLP Address, and DLLP (Data Link Layer Packet).
• TLP (Transaction Layer Packet) Data transition carries payload data from the sender to the receiver.

• TLP Address transition contains the address information of the data being transmitted.

• DLLP (Data Link Layer Packet) transition is used for flow control and error handling.
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Q1. First interview is like a screening round and mostly questions were based on my work.
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Q2. What are the DRCs I have faced, simulation debugs etc.
Ans. 
I have faced various DRCs and simulation debugs in my experience as a Senior DFT Engineer.
• I have encountered DRCs related to clock domain crossing issues

• I have debugged simulation mismatches between RTL and gate-level netlists

• I have resolved DRC violations related to scan chain connectivity

• I have optimized scan chain insertion to meet timing constraints
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Q1. Scan compression questions were asked
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Q2. Cascaded occ concept
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Q3. Timing simulation debug
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Q1. What type of debug done in your project ?
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Q2. What is interrupt and explain isr ?
Ans. 
An interrupt is a signal sent to the CPU to alert it of an event that needs immediate attention. ISR stands for Interrupt Service Routine, which is a function that handles the interrupt.
• Interrupt is a mechanism used by hardware devices to request attention from the CPU.

• ISR is a specific routine that is executed in response to an interrupt.

• ISRs are used to handle events that require immediate attention, such as hardware...read more
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Programs on bit wise operators

Q1. Swaping of 2 variables
Ans. 
Swapping the values of two variables without using a temporary variable.
• Use XOR operation to swap two variables without using a temporary variable.

• Example: a = 5, b = 10. After swapping, a = 10, b = 5.
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Q2. Implementation of protocol
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Implementation of protocol involves defining rules and procedures for communication between devices or systems.
• Define the purpose and scope of the protocol

• Specify the format and structure of data to be exchanged

• Establish rules for error detection and correction

• Implement protocol using programming languages like C, Python, or Java

• Test the protocol for interoperability and performance
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