Verilog Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. What is Verilog?
Verilog is a hardware description language (HDL) used to model electronic systems at various levels of abstraction.
Example:
module and_gate(output Y, input A, B); assign Y = A & B; endmodule
Ques 2. What is the difference between 'reg' and 'wire' in Verilog?
'reg' is used for variables that can be assigned values inside an always block, while 'wire' is used for connecting different modules.
Example:
reg [7:0] data; wire [7:0] bus;
Ques 3. What is the purpose of the 'initial' block in Verilog?
'initial' block is used to execute code only once at the beginning of simulation.
Example:
initial $display("Hello, Verilog!");
Ques 4. What is the purpose of the 'parameter' keyword in Verilog?
'parameter' is used to declare constants that can be changed during elaboration and are visible throughout the module.
Example:
parameter WIDTH = 8;
Ques 5. Explain the purpose of the 'assign' statement in Verilog.
'assign' statement is used to directly assign values to wires in a continuous assignment outside modules.
Example:
assign Y = A & B;
Ques 6. What is the purpose of the 'module' keyword in Verilog?
'module' is used to define the interface and behavior of a hardware module in Verilog.
Example:
module adder(input [3:0] A, B, output [4:0] Sum); // Module definition... endmodule
Ques 7. What is the purpose of the 'wire' data type in Verilog?
'wire' is used for connecting different modules and represents a net.
Example:
wire [7:0] bus;
Ques 8. What is the purpose of the 'localparam' keyword in Verilog?
'localparam' is used to define local parameters within a module or a generate block.
Example:
localparam WIDTH = 8;
Ques 9. Explain the purpose of the 'reg' data type in Verilog.
'reg' is used for variables that can be assigned values inside an always block and represents a register.
Example:
reg [7:0] counter;
Ques 10. Explain the purpose of the 'input' and 'output' keywords in Verilog module ports.
'input' is used to specify inputs to a module, and 'output' is used to specify outputs.
Example:
module myModule(input A, B, output Y); // Module definition... endmodule
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