Gray Code Counter (version 1)

This article introduces first of possibilities how to realize Gray Code Counter. I start with facts that I'm able to realize:

1. "plus one" logic in binary code
2. binary to gray logic
3. gray to binary logic
4. synchronous design techniques to be used (flip-flops) with asynchronous reset

Each clock the "current" result is held by the register (register output) and "next" result is at the end of combinatorial logic (register input). Figure 1 provides block diagram of the above description:

Figure 1 - Gray Code Counter

Combinatorial logic parts (gray2logic, binary2logic, +1 logic) to be explained in other articles :)