HDL

• describe hardware

• gate level, switch level, behavior level, register transfer level

• fpga multiple components parallel

• RTL pseudocode for hardware, some abstraction

• registers (sequential logic), as D flip flops, only one with memory

• combinational logic (stateless, pure function)

• sequential logic = finite state machine

• wire vs. reg

https://numato.com/kb/learning-fpga-verilog-beginners-guide-part-2-modules/