RTL meaning in digital domain

Register transfer level

In integrated circuit design, register transfer level (RTL) is a level of abstraction used in describing the operation of a synchronous digital circuit. In RTL design, a circuit's behavior is defined in terms of the flow of signals (or transfer of data) between hardware registers, and the logical operations performed on those signals.

Register transfer level abstraction is used in hardware description languages (HDLs) like Verilog and VHDL to create high-level representations of a circuit, from which lower-level representations and ultimately actual wiring can be derived.

Resistor–transistor logic

Resistor–transistor logic (RTL) is a class of digital circuits built using resistors as the input network and bipolar junction transistors (BJTs) as switching devices. RTL is the earliest class of transistorized digital logic circuit used; other classes include diode–transistor logic (DTL) and transistor–transistor logic (TTL).