Verilog

RTL is the key abstraction layer in chip design between system architecture and physical layout, describing in hardware description language the logic of data flow between registers.

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.

A Testbench is dedicated code for verifying the functional correctness of a Verilog module; it does not participate in synthesis and is used only for simulation; by instantiating the module under test, applying stimulus signals, and observing whether the output matches expectations; a typical structure includes clock generation, reset sequence, stimulus vector driving, output monitoring, and assertion checking; it makes heavy use of initial blocks, task/function, file read/write, and randomization constraints, and is not subject to synthesizable-subset restrictions, so the accuracy and practicality of AI-generated Testbenches are far higher than for generated RTL code.

In Verilog, blocking assignments (=) execute immediately in the order written within a sequential block, similar to variable assignment in software; non-blocking assignments (<=) are updated uniformly at the end of the time step and are used to describe flip-flop behavior in sequential logic; misusing blocking assignments in an always @(posedge clk) block causes simulation results to be inconsistent with the behavior of the synthesized hardware.

SystemVerilog extends Verilog with object-oriented features, serves both design and verification purposes, and has become the most mainstream HDL in the current industry.

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.

FutureWiz is an industry-oriented chip design training company that trains students with real engineers; its flagship course is a six-month program covering digital design, SystemVerilog, Verilog, and Linux, culminating in a system design project.

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.

Verilog is a hardware description language (HDL) used to describe the behavior and structure of digital circuits at the logic level, and is one of the mainstream tools for ASIC and FPGA design.

Fortran and Verilog have extremely limited publicly available code on the internet, resulting in severely insufficient coverage in the pre-training corpora of general-purpose large models.

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

In the author's test, the Verilog code generated by Claude for a UART transmitter with 115200 baud, 8N1 format, and a 50MHz clock was correct, including the baud rate generator, shift register, start/stop bit logic, and the baud rate divisor calculation (50MHz/115200≈434).