Converting logic to real or real to logic

**SystemVerilog** provides several ways to convert between different data types, including converting **logic** (which represents digital signals) to **real** (which represents floating-point numbers). Let’s explore some options:

1. **`$realtobits` and `$bitstoreal`**:
   • `$realtobits` converts a real number to a 64-bit representation, allowing it to be passed through a module port.
   • `$bitstoreal` converts a 64-bit bit-vector representation back to a real number.
2. **`$rtoi` and `$itor`**:
   • `$rtoi` truncates a real number to form an integer value.
   • `$itor` converts an integer to a real value.

Here’s an example of how you might use these functions:

reg [63:0] A;
real B;
B = $bitstoreal(A); // Convert bit-vector A to real B

integer C = 14;
B = $itor(C); // Convert integer C to real B (result: B = 14.0)

Remember that these conversions are essential when interfacing between digital logic and analog signals or when performing mathematical operations involving real numbers in your SystemVerilog designs.

 

Real Number Conversion Functions

In Verilog and SystemVerilog, several system functions can handle real number values (the `real` and `shortreal` types). These functions allow you to convert values to and from real number values and make signed or unsigned values conversions.

The following real number conversion functions are commonly used:

1. `$rtoi`: Converts a real value to an integer by truncating it.
2. `$itor`: Converts an integer value to a real value.
3. `$realtobits`: Converts a real value to a 64-bit vector representation.
4. `$bitstoreal`: Converts a 64-bit vector representation back to a real value.
5. `$shortrealtobits`: Converts a shortreal value to a 32-bit vector representation.
6. `$bitstoshortreal`: Converts a 32-bit vector representation back to a shortreal value.