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Questions and Answers
What is the primary purpose of display system tasks in Verilog?
What is the primary purpose of display system tasks in Verilog?
How many categories of display tasks are there in Verilog?
How many categories of display tasks are there in Verilog?
What is the difference between the $display and $write tasks?
What is the difference between the $display and $write tasks?
What happens when no argument is specified in a display task?
What happens when no argument is specified in a display task?
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What is the purpose of the $strobe task?
What is the purpose of the $strobe task?
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What is the syntax to use the $display task?
What is the syntax to use the $display task?
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What is the output of the following code: $write("This does not,"); $write("like this.To start new line, use newline char");
What is the output of the following code: $write("This does not,"); $write("like this.To start new line, use newline char");
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What is the main difference between the $display and $write tasks in terms of their output?
What is the main difference between the $display and $write tasks in terms of their output?
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What is the purpose of the $monitor system task in Verilog?
What is the purpose of the $monitor system task in Verilog?
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What is the effect of the line '#10;' in the given Verilog code?
What is the effect of the line '#10;' in the given Verilog code?
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What is the difference between $display and $monitor system tasks in Verilog?
What is the difference between $display and $monitor system tasks in Verilog?
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What is the initial value of 'a' and 'b' after the lines 'a = 8'h2D;' and 'b = 8'h2D;' are executed?
What is the initial value of 'a' and 'b' after the lines 'a = 8'h2D;' and 'b = 8'h2D;' are executed?
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What is the output of the [$strobe] system task at time 10ns?
What is the output of the [$strobe] system task at time 10ns?
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Study Notes
Display Tasks
- Display system tasks are used to display informational and debug messages to track the simulation flow from log files.
- There are three categories of display tasks: Display and Write tasks, Verilog strobe, and Continuous monitoring tasks.
Display and Write Tasks
- $display and $write tasks are similar to the print function in ANSI C language.
- The main difference between $display and $write is that $display adds a new line character at the end of the output, while $write does not.
- Syntax: $display() and $write().
- Both tasks display arguments in the order they appear in the argument list.
- If no argument is specified, it is declared a null argument, and a single space character is printed when the task is invoked.
Verilog Strobes
- $strobe prints the final values of variables at the end of the current delta time-step.
- Format is similar to $display.
- A newline is automatically added to the text.
- Example: $strobe is used to print the values of variables at specific times in the simulation.
Verilog Continuous Monitors
- $monitor helps to automatically print out variable or expression values whenever the variable or expression in its argument list changes.
- Achieves a similar effect of calling $display after every time any of its arguments get updated.
- A newline is automatically added to the text.
- Example: $monitor is used to continuously monitor and print the values of variables throughout the simulation.
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Description
This quiz covers the basics of Verilog display tasks, including the different categories and formats of printing values for simulation flow tracking.
