case(state)
        `fetch_0: begin
            cp_oe 		= 1;
            am_we 		= 1;
            state_next 	= `fetch_1;
        end

        `fetch_1: begin
            am_oe 		= 1;
            state_next 	= `fetch_2;
        end

        `fetch_2: begin
            ram_oe 		= 1;
            ri_we 		= 1;
            state_next 	= `decode;
        end
...