【原创】The solutional manual of the Verilog HDL: A Guide to Digital Design and Synthesis (2nd)—ch07-I

Chapter 7. Behavioral Modeling

7.11 Exercises

1. Declare a register called oscillate. Initialize it to 0 and make it toggle every 30 time units. Do not use always statement ( Hint: Use the forever loop).

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2. Design a clock with time period = 40 and a duty cycle of 25% by using the always and initial statements. The value of clock at time = 0 should be initialized to 0.

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3. Given below is an initial block with blocking procedural assignments. At what simulation time is each statement executed? What are the intermediate and final values of a, b, c, d?

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4. Repeat exercise 3 if nonblocking procedural assignments were used.

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5. What is the order of execution of statements in the following Verilog code? Is there any ambiguity in the order of execution? What are the final values of a,b,c,d?

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6. What is the final value of d in the following example? (Hint: See intra-assignment delays.)

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