Modules: Hierarchy

Instantiate a Submodule by Name

Instantiate a given submodule and wire its ports to the top-level ports by name.

Modules

Build a small circuit as a reusable module-level function.

Connecting Ports by Position

Wire module inputs and outputs consistently through a composed logic path.

Instantiate Multiple Copies of a Submodule

Instantiate four copies of a 1-bit submodule by hand to build a 4-bit bitwise circuit.

Connecting Ports by Name

Preserve signal intent across a named four-bit module interface.

Connecting Submodules with an Intermediate Wire

Chain two submodule instances together through a hand-declared intermediate wire.

4-bit Ripple-Carry Adder from Full Adders

Build a 4-bit ripple-carry adder by instantiating four full-adder submodules and chaining their carry signals.

Combining Two Different Submodule Types

Combine instances of two different submodule types (AND gates and an OR gate) to build an AND-OR circuit.

Three Modules

Connect three logic stages to build one combined circuit.

Modules and Vectors

Apply a repeated one-bit operation across four vector positions.

Adder 1

Add two two-bit operands with a three-bit result.

Adder 2

Add two 16-bit words and a carry-in.

Carry-Select Adder

Build the correct result for an eight-bit carry-select adder.

Adder-Subtractor

Select unsigned addition or subtraction with a control input.