If you are visually scanning waveforms to see if 0xAB equals 0xAB , you have already lost. Automate the verification. Let the simulator scream at you the instant a principle is violated.
If you are stuck on VHDL 93, the PDF will beg you to manually list every signal. Miss one? You just created a transparent latch. Latches are evil. Don't build latches. effective coding with vhdl principles and best practice pdf
Novices try to build entire CPUs inside a single process. Experts know that a process is a jealous container. If you put counter logic and a state machine together, they fight. If you are visually scanning waveforms to see
It is available in PDF format.