Explicit vs Implicit FSMs
Digital control paths often require sequencing through a fixed number of operations, which can be implemented using either a formal state machine or a counter with decoding logic. The design contains two modules intended to sequence ten distinct events. Module A is a one-hot explicit Finite State Machine with ten states, a state register, and next-state logic. Module B is an implicit FSM built from a four-bit binary counter and a combinational decode block to generate ten distinct output flags. Both modules receive a clk and an en signal and produce a 10-bit output vector flags. Analyze the architectural tradeoffs between these two approaches. Determine the register count, combinational depth, and overall area implications for each implementation.
Constraints
- Assume standard-cell synthesis targeting minimum area.
- Module A utilizes strict one-hot encoding for all states.
- Module B utilizes standard binary encoding for its counter.
- The sequence is perfectly linear with no branching or conditional jumps.
Topics
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