Fpga Design Engineer
10+ Fpga Design Engineer Interview Questions and Answers
Q1. What is FPGA, have you ever work with one such?
FPGA stands for Field-Programmable Gate Array, a type of integrated circuit that can be reconfigured after manufacturing.
FPGA is a type of hardware that can be programmed to perform specific tasks.
It consists of a matrix of configurable logic blocks connected via programmable interconnects.
FPGAs are commonly used in applications such as signal processing, data processing, and control systems.
Examples of FPGA manufacturers include Xilinx, Intel (formerly Altera), and Lattice S...read more
Q2. Difference between blicking and non blocking
Blocking and non-blocking are two types of assignments in Verilog that differ in their execution order and timing.
Blocking assignments execute in a sequential order and the next statement waits for the current statement to complete before executing.
Non-blocking assignments execute concurrently and the next statement does not wait for the current statement to complete before executing.
Blocking assignments are used for combinational logic while non-blocking assignments are used...read more
Fpga Design Engineer Interview Questions and Answers for Freshers
Q3. Write code for read and write file
Code for read and write file
Use fopen() function to open a file
Use fprintf() function to write to a file
Use fscanf() function to read from a file
Close the file using fclose() function
Q4. What is CDC and explain the CDC techniques
CDC stands for Clock Domain Crossing. It refers to transferring data between different clock domains in an FPGA design.
CDC occurs when signals cross between different clock domains in an FPGA design
CDC can lead to metastability issues if not handled properly
Common CDC techniques include synchronizers, handshake protocols, and FIFO buffers
Examples of CDC techniques include 2-flop synchronizers, Gray coding, and CDC FIFOs
Q5. Difference between task and function in verilog
Task and function are subprograms in Verilog used for code modularity and reusability.
Functions return a value while tasks do not.
Functions can be called from expressions while tasks cannot.
Tasks can have delays and event controls while functions cannot.
Functions can have multiple return statements while tasks cannot.
Functions can have input and output arguments while tasks can only have input arguments.
Q6. Write code for ram and fifo.
RAM and FIFO are essential components in FPGA design. Here's how to write code for them.
For RAM, define the memory size and data width, then instantiate the memory module and write/read data using the address bus and data bus.
For FIFO, define the depth and data width, then instantiate the FIFO module and write/read data using the write and read pointers.
Use synchronous or asynchronous reset signals to initialize the RAM and FIFO modules.
Consider the clock frequency and timing...read more
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Q7. Difference between task and function
Task and function are both subprograms in Verilog/SystemVerilog, but task is used for procedural blocks and function is used for expressions.
Task is used for procedural blocks and can contain delays and event control statements.
Function is used for expressions and cannot contain delays or event control statements.
Functions can return a value, while tasks cannot.
Functions can be called from within tasks or other functions, while tasks can only be called from within procedural ...read more
Q8. Determine the unkonw clock frequency with know one
Use a frequency counter or oscilloscope to measure the period of a known signal and calculate the frequency.
Measure the period of a known signal using a frequency counter or oscilloscope.
Calculate the frequency using the formula: Frequency = 1 / Period.
For example, if the period of the signal is 10 ms, the frequency would be 1 / 0.01 = 100 Hz.
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Q9. write HalfAdder program in vhdl?
A HalfAdder program in VHDL is used to perform addition of two binary digits without considering the carry.
Declare two input signals A and B of type std_logic.
Declare two output signals Sum and Cout of type std_logic.
Implement the XOR gate for Sum and AND gate for Cout.
Example: A <= '1'; B <= '0'; Sum <= A XOR B; Cout <= A AND B;
Q10. Explain about reset
Reset is a signal used to initialize the system or a specific module.
Reset is used to bring the system or module to a known state.
It is an asynchronous signal that overrides all other signals.
There are different types of resets such as power-on reset, soft reset, hard reset, etc.
Reset can be active high or active low depending on the design.
Reset can be generated internally or externally.
Reset can be used to clear registers, counters, and other state elements.
Q11. explain about UART PROTOCOL?
UART (Universal Asynchronous Receiver/Transmitter) protocol is a communication protocol used for serial communication between devices.
UART is a popular communication protocol used for transmitting and receiving data between devices asynchronously.
It uses two wires for communication - one for transmitting data (TX) and one for receiving data (RX).
UART communication involves start and stop bits to frame the data being transmitted.
Baud rate is an important parameter in UART comm...read more
Q12. Improvent of logic used
Improving logic used in FPGA design involves optimizing resource utilization, reducing power consumption, and enhancing performance.
Utilize efficient coding techniques to minimize logic complexity
Implement pipelining to improve performance
Use advanced synthesis and optimization tools to reduce resource usage
Optimize clocking strategies to minimize power consumption
Consider parallel processing to increase throughput
Q13. Design a counter
Design a counter using flip-flops to count up or down based on the input signal.
Use D flip-flops to store the count value
Connect the output of one flip-flop to the input of the next flip-flop to create a ripple effect
Use additional logic gates to control the direction of counting (up or down)
Implement a reset signal to initialize the counter to a specific value
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