Asic Design Verification Engineer Interview Questions and Answers

Verilog code to divide frequency of a 100hz square wave signal with 50% duty cycle by 3.

• Create a counter that counts up to 3 and resets back to 0

• Use the counter to toggle an output signal every 3 cycles of the input signal

• The output signal will have a frequency of 100/3 = 33.33hz with 50% duty cycle

To predict if a 32 bit number is divisible by 8, design a circuit using gates.

• Use a circuit with AND, OR, and NOT gates to check if the last three bits of the number are all zeros.

• If the last three bits are zeros, then the number is divisible by 8.

• For example, if the 32 bit number is 11010000, the last three bits are zeros, so it is divisible by 8.

Convert number system by dividing by base and taking remainders. Use 2:1 Mux to implement NAND gate.

• To convert from one number system to another, divide by the base of the original system and take remainders.

• For example, to convert decimal 10 to binary, repeatedly divide by 2 and take remainders: 10/2=5 R0, 5/2=2 R1, 2/2=1 R0, 1/2=0 R1. So, 10 in decimal is 1010 in binary.

• To implement a NAND gate using a 2:1 Mux, connect one input to the select line and the other input to the...read more

A bus functional model is a high-level model of a bus protocol used for verification. It is written in a hardware description language.

• A bus functional model simulates the behavior of a bus protocol in a verification environment.

• It is written in a hardware description language like SystemVerilog or VHDL.

• The model includes the functionality of the bus protocol such as transactions, timing, and error handling.

• It is used to verify the interaction between the design under test an...read more

Implementing an 8X1 mux using if else statements with clock and reset

• Declare input signals, output signal, clock and reset signals

• Use if else statements to select the output based on the select lines

• Ensure proper handling of clock and reset signals

• Example: if(sel == 3) output = in3;

Polymorphism is the ability of a function or method to behave differently based on the object it is called with.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to represent multiple data types.

• Examples include method overloading and method overriding in object-oriented programming languages like Java.

A multiplexer (mux) is a digital circuit that selects one of several input signals and forwards it to a single output. A flip-flop (ff) is a type of latch circuit that stores a single bit of data.

• Mux design involves selecting one of multiple input signals based on a control signal

• FF design involves storing a single bit of data using a clock signal

• Mux can be implemented using logic gates like AND, OR, and NOT gates

• FF can be implemented using basic components like NAND gates

• Bot...read more