Verilog: Frequently Asked Questions: Language, Applications by Shivakumar S. Chonnad, Needamangalam B. Balachander

By Shivakumar S. Chonnad, Needamangalam B. Balachander

This publication addresses "front finish" questions and matters encountered in utilizing the Verilog HDL, in the course of the entire phases of layout, Synthesis and Verification. the problems mentioned within the publication tend to be encountered in either ASIC layout initiatives in addition to in delicate IP designs. those concerns are addressed in an easy Q&A structure. given that each one factor is independently handled and defined intimately, this booklet acts as a massive resource of reference for the Verilog clients. all the FAQs should be illustrated with figures and tables as required. the most recent Verilog-2001 and SystemVerilog have additionally been talked about during this book.

With the expanding complexity of ASICs being designed nowadays, the selections that one makes in any of the levels of layout, Synthesis or Verification has profound results on those 3 phases. This e-book provides the intricacies of those inter-dependent concerns within the context of the Verilog HDL.

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By default, an unconnected input port is a floating port, and hence shows “z” during simulation. The logic following it will also propagate the “z”, until gated off by an AND gate. The following figure shows the in1 floating in lower instantiation. Since in1 was used as logic input to both the gates, and is no more driving both of them, the logic gets optimized and simplified into a simple wire connection between in2 and out2. This connection still maintains the AND’ing logic required between these two ports, as per its design.

6 Can I use a Verilog function to define the width of a multi-bit port, wire, or reg type? The width elements of ports, wire or reg declarations require a constant in both MSB and LSB. Before Verilog 2001, it is a syntax error to specify a function call to evaluate the value of these widths. For example, the following code is erroneous before Verilog 2001 version. In the above example, get_high and get_low are both function calls of evaluating a constant result for MSB and LSB respectively. However, Verilog-2001 allows the use of a function call to evaluate the MSB or LSB of a width declaration.

The call of the function my_func within the initial-begin-end does not require a destination, since the return has been voided. Some other intermediate variable like int_result declared in the above example at the scope of that module can still be modified within the voided function. SystemVerilog also allows functions with a return to be called as a task by casting the function call to void. 6 What are the rules governing usage of a Verilog function? The following rules govern the usage of a Verilog function construct: A function cannot advance simulation-time, using constructs like #, @.

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