Constants

Constants can often be inferred by ROHD automatically, but can also be explicitly defined using Const, which extends Logic.

// a 16 bit constant with value 5
var x = Const(5, width: 16);

Preferred radix

The optional preferredRadix controls how a Const is displayed in generated outputs. Supported radices are binary (2), octal (8), decimal (10), and hexadecimal (16). The radix only affects formatting, not the value of the constant.

var binary = Const(42, width: 8, preferredRadix: 2);     // 8'b101010
var octal = Const(42, width: 8, preferredRadix: 8);      // 8'o52
var decimal = Const(42, width: 8, preferredRadix: 10);   // 8'd42
var hexadecimal = Const(42, width: 8, preferredRadix: 16); // 8'h2a

Constants containing x or z may fall back to binary so all bit states can be represented.

Binary integer conversion

There is a convenience function for converting binary to an integer:

// this is equivalent to and shorter than int.parse('010101', radix: 2)
// you can put underscores to help with readability, they are ignored
bin('01_0101')