How to Enable and Disable Calculator Mode in Verilog

Disable Calculator Mode in Verilog
Disable Calculator Mode in Verilog

Verilog provides a number of functions that allow you to control how calculator mode works. You can enable or disable it by using a verilog-auto-inst function. If you do not want to use a verilog-auto-inst, you can also use a constant expression. This will cause the compiler to return an error if it encounters a non-nil variable.

The first step in the simulation is to set up the time scale. The tstart value is used to represent the previous simulation time. After a certain number of clock-cycles, the simulation is stopped. Depending on how the simulation is designed, it may be necessary to define an if statement to ensure that the simulator will not continue until a specific condition is met.

The mode argument is used to determine whether a function will continue the simulation or stop after the current step. A value of 0 will result in the whole simulation being completed, while a value of 1 will continue the simulation and terminate the current step. In multi-step analysis, omitting the mode argument will cause the whole simulation to finish.

During the simulation, you can use the display/fdisplay command to trace the results. This command displays the outputs as binary or decimal values. It can also be used to track only the final results. However, this is a slow method of displaying outputs. Therefore, you may prefer to use the $ferror function instead.

To implement a multidimensional lookup table, you can use the $table_model function. This function does the same thing as the $fwrite function, but it pauses the simulation after the current step is complete.

You can use the $table_model function to implement LRM 2.4. However, LRM 2.4 does not yet support concatenation of input and outputs. For this reason, you may want to use a separate module for each dimension. An example of this is the inner dimension.

There are several ways to specify a group name. You can use an empty string, a “” quotation, or a regular expression. Regardless of the method, a group name will not work in the initial_step event.

There are also optional parameter sets that you can specify. These include the verilog-auto-inst-dot-name setting, which uses the syntax for signal names. Also, the verilog-auto-inst-template-numbers setting is useful if you need to debug complicated templates.

Another way to implement an analog initial block is to use an explicit continuous assignment. This combination of a net declaration and a continuous assignment is not standard. Moreover, the type_string argument may trigger an error in other Verilog-A implementations.

Similarly, you can use an implicit continuous assignment. This combination of a net and continuous assignment is not standard, but it simplifies the enable and disable behavior of blocks. Additionally, it can save space since it combines both of the statements into one.

One option is to write a custom string that you can place in the returned_message_string variable. The string can contain meaningful information that you can pass to the simulator when enabling or disabling the calculator.