Interface

Interface is one of top level components in source code. Interface has overridable parameters, and interface definitions.

Overridable parameters are the same as them of module.

In interface definitions, modport can be declared. modport can be used as bundled port connection at the port declaration of module.

interface InterfaceA #(
    param ParamA: u32 = 0,
    param ParamB: u32 = 0,
) {
    var a: logic;
    var b: logic;

    modport master {
        a: output,
        b: input ,
    }

    modport slave {
        b: input ,
        a: output,
    }
}

Default members of modport

Instead of specifing all members of modport, default members can be specified like below:

• ..input: all variables in the interface as input
• ..output: all variables in the interface as output
• ..converse(modport_name): the same variables as modport_name, but all direction is converse

Specifing default members can be used with normal explicit members.

interface InterfaceA {
    var a: logic;
    var b: logic;
    var c: logic;

    modport master {
        a: output,
        b: input ,
        c: input ,
    }

    modport slave {
        ..converse(master)
    }

    modport monitor {
        ..input
    }

    modport driver {
        b: input,
        ..output
    }
}