Complex Multiplier FSM Controller

The FSM is a five-state Moore machine.

Behavior

• STEP1 is idle: pp1_ce=1. The FSM remains there while input_rdy=0.
• When input_rdy=1, the next rising edge enters STEP2: a_sel=1, b_sel=1, pp2_ce=1.
• STEP3: b_sel=1, pp1_ce=1, sub=1, p_r_ce=1.
• STEP4: a_sel=1, pp2_ce=1.
• STEP5: p_i_ce=1, followed unconditionally by STEP1.
• Every output not listed for a state is 0.

reset is asynchronous, active high, and forces STEP1.