VHDL

In retro console scenarios, developers obtain logic descriptions of the original console's CPU, PPU, APU, and other chips through reverse engineering, then use hardware description languages (such as Verilog, VHDL) to map them onto an FPGA.

RTL (register transfer level) is a high-level abstraction of chip design, using hardware description languages (such as Verilog or VHDL) to describe the logic of data flowing between registers; GDSII is the final delivery format for a chip's physical layout, containing the geometric shape information of each mask layer and can be sent directly to a wafer fab for tape-out.

Hardware description languages (HDL) describe the concurrent behavior of hardware circuits, which is fundamentally different from ordinary programming languages that describe sequentially executed instructions.

The core skills required to enter chip design include object-oriented programming ability, hardware description languages (Verilog/VHDL/SystemVerilog), backend and analog design tools, and knowledge of protocols such as USB and PCI.

Verilog and VHDL are the most commonly used RTL description languages.

RTL code is typically written in hardware description languages such as Verilog or VHDL.

Entry-level skills for chip design include hardware description languages (HDL), such as Verilog, SystemVerilog, or VHDL.