Verilog Interview Questions and Answers
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Ques 1. What is the purpose of the 'fork-join' construct in Verilog?
'fork-join' is used for parallel execution of blocks within the same 'initial' or 'always' block.
Example:
initial begin fork begin // Block 1 $display("Block 1"); end join fork begin // Block 2 $display("Block 2"); end join end
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Ques 2. Explain the 'generate' block in Verilog.
'generate' block is used to conditionally instantiate or elaborate code during compilation.
Example:
generate if (USE_FEATURE) begin // Code to be included if USE_FEATURE is true end endgenerate
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Ques 3. Explain the 'rand' and 'randc' functions in SystemVerilog.
'rand' generates a random number, and 'randc' generates a random number with a specific distribution.
Example:
rand int randomNumber; // Generates a random integer randc int weightedRandomNumber; // Generates a random integer with specific distribution
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Ques 4. What is the significance of the 'event' data type in Verilog?
'event' is used to represent the occurrence of an event and is commonly used in conjunction with wait statements.
Example:
event evt; // Declares an event wait(evt); // Waits for the event 'evt'
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Ques 5. What is the purpose of the 'deassign' keyword in Verilog?
'deassign' is used to remove the assignment of a variable to a net, allowing it to return to its natural state.
Example:
deassign bus; // Removes the assignment of 'bus'
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