一段式状态机与三段式状态机

一段式状态机代码如下：
always@（posedge ui_clk）begin
if(ui_rstn) begin
      M_S <= IDLE;
      Counter0 <= 10'd0;
      Send_Req <= 1'b0;
      Addr_cnt <= 12'd0;
      Tx_busy <= 1'b0;
      FIFO_rst <= 1'b1;
end
else begin
      case(M_S)
         IDLE: begin

Counter0 <= 10'd0;

Send_Req <= 1'b0;

Addr_cnt <= 12'd0;

Tx_busy <= 1'b0;

if(empty) M_S <= FIFO_RST;

FIFO_RST: begin

Tx_busy <= 1'b1;

if(Counter0 >= 10'd100) M_S <= SEND_REQ;

FIFO_rst <= (Counter0 <= 10'd80);

Counter0 <= Counter0 + 1'b1;

end

SEND_REQ:begin

if(Addr_cnt >= 12'd2047)

M_S <= IDLE;

else if(empty) begin

M_S <=SEND_DATA;

Send_Req <= 1'b1;

Counter0 <= 10'd0;

end

SEND_DATA: begin

Send_Req <= 1'b0;

if(Send_done) begin

M_S <= SEND_REQ;

Addr_cnt <= Addr_cnt + 4'd8;

end

end
end
请大神帮忙改写为三段式状态机。自己试着写过，在状态数量不变的情况下，难以实现。

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