Register-Transfer Level (RTL)
The Register-Transfer Level (RTL) is a level of abstraction in digital design where the behavior of the digital circuit is described in terms of the flow of data between registers, as well as the logical operations performed on that data. At this level, components like ALU, memories, registers, muxes, and decoders are defined.

Components at RTL
- ALU: Arithmetic Logic Unit (ALU) is a digital circuit that performs arithmetic and logical operations on data. It is a crucial component in processors for carrying out computations.
- Memories: Memory units store data and instructions for processing by the CPU. These can include RAM, ROM, cache memory, etc.
- Registers: Registers are small, fast storage elements used to hold data temporarily during processing. They are often used to store operands and results of operations.
- Muxes: Multiplexers (muxes) are digital circuits that select one of many input signals and route it to the output based on a control signal.
- Decoders: Decoders are combinational circuits that convert coded inputs into a set of output signals.

Role in RTL
At the RTL level, these components are interconnected to define the data flow and operations within the digital circuit. The interactions between registers, ALU, memories, muxes, and decoders form the basis of the functional behavior of the design. RTL descriptions are used as a basis for further refinement into gate-level or switch-level implementations.
In conclusion, the Register-Transfer Level is where components like ALU, memories, registers, muxes, and decoders are defined and interconnected to describe the behavior of a digital circuit in terms of data flow and logical operations.