![]() ![]() > Just like a module, program block has ports. Unlike $finish, which exits simulation immediately, even if there are pending events. > Each program can be explicitly exited by calling the $exit system task. Only initial and methods are allowed, which are more controllable. ![]() > It provides a syntactic context that specifies scheduling in the Reactive region which avoids races. > It creates a scope that encapsulates program-wide data. > It provides an entry point to the execution of testbenches. > The program block helps ensure that test bench transitions do not have race conditions with the design The program block serves these basic purposes: It is declared using program and endprogram keywords. Systemverilog adds a new type of block called program block. However, for the testbench, a lot of effort is spent getting the environment properly initialized and synchronized, avoiding races between the design and the testbench, automating the generation of input stimuli, and reusing existing models and other infrastructure. The module is the basic building block in Verilog which works well for Design. ![]()
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