Verilog Design of Negative and Positive edged D-Flip-Flop

Steps to Complete the Code

1. Arrange the Code Blocks:

   • Place the code block that defines the Verilog module name, inputs, and outputs first.
   • Next, add the code block that defines the module functionality (the always block).
   • Finally, add the code block that ends the module.

2. Drag and Drop:

   • Drag and drop the code blocks to arrange them in the order mentioned above for both the Verilog module and the testbench.

3. Complete the Code Blocks:

   • For the Verilog module:

     • Enter a name for the module. The name should begin with an alphabet and can include alphanumeric characters and underscores (_). No spaces or special characters allowed.
     • Select the inputs as D and CLK, and the output as Q.
     • In the always block, assign Q the value of D at the clock edge:
       • For a positive edge D Flip-Flop, select posedge CLK.
       • For a negative edge D Flip-Flop, select negedge CLK.
     • Use the non-blocking assignment operator (<=) for sequential logic.

   • For the Verilog testbench:

     • Enter a name for the testbench. The name should begin with an alphabet, include only alphanumeric characters and underscores, and must not match the module name.
     • Declare D and CLK as registers, and Q as a wire.
     • Instantiate the D Flip-Flop module by entering its name and selecting the arguments in the same order as in the module definition.
     • Define the input D waveform using the dropdown options provided.
     • Define the clock (CLK) waveform in the appropriate block.

Note:

• While naming modules, testbenches, variables, and instance names, ensure they begin with an alphabet or underscore and only contain alphanumeric characters and underscores.
• Do not use the same name for any two variables in the same module or testbench.

Observations

• After clicking the Validate button (assuming all code blocks are filled correctly), you should see a "Success" message and a truth table for the input D wave you have selected, under the Observations section.
• Observe the fluctuations in the input wave and the corresponding expected and observed output Q wave.