Register-transfer level
![Example of a simple circuit with a toggling output. The inverter forms the combinational logic in this circuit, and the register holds the state.](/Images/godic/202502/06/Register_transfer_level_-_example_toggler.svg1524.png")
In digital circuit design, register-transfer level (RTL) is a design abstraction which models a synchronous digital circuit in terms of the flow of digital signals (data) between hardware registers, and the logical operations performed on those signals.