Verilog Programming part 6
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3.3 System Tasks and Compiler Directives In this section, we introduce two special concepts used in Verilog: system tasks and compiler directives. 3.3.1 System Tasks Verilog provides standard system tasks for certain routine operations. All system tasks appear in the form $. Operations such as displaying on the screen, monitoring values of nets, stopping, and finishing are done by system tasks. We will discuss only the most useful system tasks. Other tasks are listed in Verilog manuals provided by your simulator vendor or in the IEEE Standard Verilog Hardware Description Language specification. Displaying information $display is the main system task...
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