Why two competing hardware description languages exist, structural vs. dataflow vs. behavioral modeling, blocking vs. non-blocking assignment, testbenches and simulation, and the classic latch-inference pitfall every new HDL author eventually hits.
Verilog and VHDL both describe the same target hardware in text, but they come from opposite design philosophies — Verilog's terse, C-like syntax favors fast iteration, while VHDL's strongly typed, Ada-derived syntax catches more errors before a simulation ever runs. This module builds the mental model the rest of the program leans on: the three modeling styles every real design mixes, why an always block's or process's sensitivity list can make a design simulate one way and synthesize another, and the assignment-type discipline that keeps sequential logic race-free.
By the end of this module you should be able to explain why an incomplete if/case statement silently infers an unwanted latch instead of throwing a compile error — a bug that often simulates as if nothing were wrong. This module targets the sequential logic from Module 3 and the FPGA fabric from Module 4 directly, and Module 16's Design Verification content goes considerably deeper into the testbench methodology introduced here.