请帮我把我的代码进一步模块化：module sap1(outport,rst,cp); output [7:0]outport; input rst; input cp; parameter s0=3'b000, s1=3'b001, s2=3'b010, s3=3'b011, s4=3'b100, s5=3'b101; reg[2:0]pstate=3'b000; reg[2:0]nstate; reg[3:0]pc; reg[3:0]mar; reg[7:0]acc; reg[7:0]ir; reg[3:0]tmp; reg[7:0]breg; reg[7:0]outreg; reg run; wire cs; wire[7:0]romdata; wire[3:0]addrbus; wire[7:0]databus; reg flag,f1; reg[7:0]num; always@(negedge cp or posedge rst) begin if(rst) begin pc<=4'b0000; acc<=8'b0000_0000; run<=1'b1; pstate<=s0; nstate<=s0; flag=1; end else begin if(run) begin case(pstate) s0:begin nstate<=s1; f1=1; mar<=pc; end s1:begin nstate<=s2; if(flag) begin pc<=pc+1'b1; flag=1'b0; end end s2:begin nstate<=s3; flag=1; ir<=databus; end s3:begin nstate<=s4; tmp<=ir[7:4]; end s4:nstate<=s5; s5:nstate<=s0; endcase end if(pstate==s3) begin if((tmp==4'b0000)||(tmp==4'b0001)||(tmp==4'b0010)) mar<=ir[3:0]; else if(tmp==4'b1110) outreg<=acc; else if(tmp==4'b1111) run<=1'b0; end else if(pstate==s4) begin if(tmp==4'b0000) acc<=databus; else if(tmp==4'b0001) breg<=databus; else if(tmp==4'b0010) breg<=databus; end else if(pstate==s5) begin if((tmp==4'b0001)&&(f1==1'b1)) begin num=acc+breg; acc<=num; f1=1'b0; end else if((tmp==4'b0010)&&(f1==1'b1)) begin num=acc-breg; acc<=num; f1=1'b0; end end end end rom1 u1(romdata,addrbus,cs); assign addrbus=((pstate==s2)||(pstate==s4))?mar:4'b0000; assign databus=(cs==1'b0)?romdata:8'bxxxx_xxxx; assign cs=((pstate==s2)||(pstate==s4))?1'b0:1'b1; assign outport=outreg; endmodule

Sure! Here's a possible modularization of your code:

1. Control unit module:

module control_unit(input clk, input rst, output reg[2:0] pstate);

// Define states as parameters
parameter s0=3'b000, s1=3'b001, s2=3'b010, s3=3'b011, s4=3'b100, s5=3'b101;

// Internal signals
reg[2:0] nstate;
reg flag, f1;
reg[3:0] pc;
reg[3:0] mar;
reg[7:0] ir;
reg[3:0] tmp;
reg run;

// Outputs
output reg cs;
output reg[3:0] addrbus;

// Initialize state and flag
always @(posedge clk, posedge rst) begin
    if (rst) begin
        pstate <= s0;
        flag <= 1'b1;
    end else begin
        pstate <= nstate;
    end
end

// State machine
always @(*) begin
    case (pstate)
        s0: begin
            nstate = s1;
            f1 = 1;
            mar = pc;
        end
        s1: begin
            nstate = s2;
            if (flag) begin
                pc = pc + 1'b1;
                flag = 1'b0;
            end
        end
        s2: begin
            nstate = s3;
            flag = 1;
        end
        s3: begin
            nstate = s4;
            tmp = ir[7:4];
        end
        s4: begin
            nstate = s5;
        end
        s5: begin
            nstate = s0;
        end
    endcase
end

// Output logic
always @(*) begin
    case (pstate)
        s2, s4: begin
            addrbus = mar;
            cs = 1'b0;
        end
        default: begin
            addrbus = 4'b0000;
            cs = 1'b1;
        end
    endcase
end

endmodule

2. ALU module:

module alu(input clk, input rst, input [7:0] a, input [7:0] b, input [3:0] op, output reg[7:0] outreg);

// Internal signals
reg[7:0] num;
reg f1;

// Initialize flag
always @(posedge clk, posedge rst) begin
    if (rst) begin
        f1 <= 1'b1;
    end else begin
        f1 <= 1'b0;
    end
end

// ALU operations
always @(*) begin
    case (op)
        4'b0000: begin // load a
            outreg = a;
        end
        4'b0001: begin // load b
            outreg = b;
        end
        4'b0010: begin // store b
            outreg = b;
        end
        4'b0001, 4'b0010: begin // add/subtract with carry
            if (f1) begin
                num = a + b;
                outreg = num;
                f1 = 1'b0;
            end
        end
    endcase
end

endmodule

3. Memory module:

module memory(input clk, input rst, input [3:0] addr, input [7:0] din, output reg[7:0] dout);

// Memory array
reg[7:0] mem[16];

// Initialize memory
initial begin
    mem[0] = 8'h00; // NOP
    mem[1] = 8'h01; // LDA addr
    mem[2] = 8'h02; // LDB addr
    mem[3] = 8'h03; // STB addr
    mem[4] = 8'h04; // ADD
    mem[5] = 8'h05; // SUB
    mem[14] = 8'hFE; // OUT
    mem[15] = 8'hFF; // HLT
end

// Read/write operations
always @(posedge clk, posedge rst) begin
    if (rst) begin
        dout <= 8'b0000_0000;
    end else begin
        if (din != 8'bz) begin
            mem[addr] <= din;
        end
        dout <= mem[addr];
    end
end

endmodule

4. Top-level module:

module sap1(outport, rst, cp);

// Inputs
input rst;
input cp;

// Outputs
output [7:0] outport;

// Internal signals
wire cs;
wire[7:0] romdata;
wire[3:0] addrbus;
wire[7:0] databus;

// Instantiate modules
control_unit u1(cp, rst, pstate, nstate, flag, f1, pc, mar, ir, tmp, run, cs, addrbus);
memory u2(cp, rst, addrbus, databus, ir);
alu u3(cp, rst, acc, breg, tmp, outreg);
memory u4(cp, rst, addrbus, databus, outreg);

// Connect memory and databus
assign databus = (cs == 1'b0) ? romdata : 8'bzzzz_zzzz;
assign romdata = u2.dout;

// Connect top-level inputs/outputs
assign outport = u4.dout;

endmodule

Please note that this is just one possible way of modularizing your code. The actual design may depend on specific requirements and constraints.