By Donald E. Thomas, Philip R. Moorby
The Verilog language is a description language which gives a method of specifying a electronic method at a variety of degrees of abstraction. The language helps the early conceptual phases of layout with its behavioral point of abstraction, and the later implementation phases with its structural point of abstraction. The language offers hierarchical constructs, permitting the fashion designer to regulate the complexity of an outline. Verilog was once initially designed within the iciness of 1983/84 as a proprietary verification/simulation product. due to the fact then, numerous different proprietary research instruments were constructed round the language, together with a fault simulator and a timing analyzer; the language being instrumental in supplying consistency throughout those instruments. Now, the language is overtly to be had for any instrument to learn and write. This booklet introduces the language. it's occasionally tough to split the language from the simulator software as the dynamic facets of the language are outlined incidentally the simulator works. the place attainable, we now have stayed clear of simulator-specific info and focused on layout specification, yet have incorporated adequate details with a view to have operating executable types. The booklet takes an academic method of providing the language.
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11. The Seed-Number Generator. 12). The behavior of this module shows that it waits for flag to be zero before proceeding with its calculations. Tracing back through the input port, we can see that flag is the q output of nandLatch. Thus, fibNumberGen waits on a signal complementary to what numberGen waits for. When flag becomes zero, the startingValue input is copied into myValue and a 10 nanosecond pulse is sent out on the numConsumed line to set the nandLatch and signal module numberGen to begin producing another new number.
Essentially, each statement of the computer process would have to include a check for new input data from the interface and a description of what to do if it is found. In the worst case, if we have two processes that have nand m states respectively, then the combined process with equivalent functionality would have n *m states -- a description of far higher complexity. Indeed, it is necessary to conceive of the separate processes in a system and describe them separately. However, when several processes exists in a system and information is to be passed among them, we must synchronize the processes to make sure that correct information is being passed.
It is called from a calling statement and after execution, returns to the next statement. It cannot be used in an expression. Parameters may be passed to it and results returned. Local variables may be declared within it and their scope will be the task. 9 illustrates how module Mark-l could be rewritten using a task to describe a multiply algorithm. A task is defined within a module using the task and endtask keywords. This task is named multiply and is defined to have one inout (a) and one input (b).