Or: task $cast(singular destVar, singular sourceExp) ĭestVar is the destination variable to which the assignment is made, while sourceExp is the expression that will be assigned to the destination variable. Here's how the syntax looks for both modes: function int $cast(singular destVar, singular sourceExp) The $cast function can be used in two modes - as a task and as a function.

Dynamic Casting with $cast Functionĭynamic casting using the $cast function is a powerful feature in SystemVerilog that allows you to assign values to variables that might not ordinarily be valid due to differing data types. In this example, the $signed function is used to convert the 8-bit data to a signed value, and the $unsigned function is used to convert it to an unsigned value. $display('Unsigned data: %0h', unsignedData) $display('Signed data: %0h', signedData) Here's an example to demonstrate the usage of signedness conversion functions: module SignedUnsignedExample For such situations, you can use $signed and $unsigned functions: In some scenarios, you may need to convert the signedness of expressions without changing the actual data type. The DataReceiver module then uses $bitstoreal to convert the 64-bit vector representation back to a real value. In this example, the DataSender module uses $realtobits to convert the temperature real value into a 64-bit vector representation. Module DataReceiver(input logic realData) Īssign temperature = $bitstoreal(realData) Here's how you could use $realtobits and $bitstoreal functions to convert real values for data transmission: module DataSender(output logic realData) Īssign realData = $realtobits(temperature) Suppose we have two modules, DataSender and DataReceiver, which communicate real values with each other. Let's look at a simple example to better understand real number conversion functions. Practical Usage of Real Number Conversion Functions $bitstoshortreal: Converts a 32-bit vector representation back to a shortreal value.įor more information on real number data types, refer to the post Real, Shortreal, and Realtime Data Types in Verilog and SystemVerilog.$shortrealtobits: Converts a shortreal value to a 32-bit vector representation.$bitstoreal: Converts a 64-bit vector representation back to a real value.

$realtobits: Converts a real value to a 64-bit vector representation.$itor: Converts an integer value to a real value.$rtoi: Converts a real value to an integer by truncating it.The following real number conversion functions are commonly used: These functions allow you to convert values to and from real number values and make signed or unsigned values conversions. In Verilog and SystemVerilog, several system functions can handle real number values (the real and shortreal types). In this tutorial, we'll go over several important conversion functions that will make your life as a designer much easier. They help in handling and converting different data types seamlessly and efficiently. Conversion functions play a crucial role in digital design with Verilog and SystemVerilog.

Verilog convert binary to decimal