基于FPGA的MC8051单片机IP设计Veriilog描述

以下是一个基于FPGA的MC8051单片机IP的Verilog描述：

module mc8051(
    input clk,
    input reset,
    
    input [7:0] data_in,
    output [7:0] data_out,
    
    output p1_0,
    output p1_1,
    output p1_2,
    output p1_3,
    output p1_4,
    output p1_5,
    output p1_6,
    output p1_7,
    
    output p2_0,
    output p2_1,
    output p2_2,
    output p2_3,
    output p2_4,
    output p2_5,
    output p2_6,
    output p2_7
);

// Internal registers
reg [7:0] acc;
reg [7:0] b;
reg [7:0] dptr;
reg [7:0] psw;
reg [7:0] sp;
reg [7:0] p0;
reg [7:0] p1;
reg [7:0] p2;
reg [7:0] p3;
reg [7:0] tcon;
reg [7:0] tmr0;
reg [7:0] scon;
reg [7:0] ie;
reg [7:0] ip;

// Internal signals
reg [7:0] opcode;
reg [7:0] operand;
reg [7:0] ea;
reg [7:0] pc_next;
reg [7:0] data_internal;
reg [7:0] addr_internal;

// Program memory
reg [7:0] program_memory [0:255];

// Data memory
reg [7:0] data_memory [0:255];

// Instruction decoder
always @ (posedge clk) begin
    if (reset) begin
        opcode <= 8'h00;
        operand <= 8'h00;
    end else begin
        opcode <= program_memory[pc_next];
        operand <= program_memory[pc_next + 1];
    end
end

// Address decoder
always @ (opcode, operand, psw, sp, dptr, p0, p1, p2, p3) begin
    case (opcode)
        // ADD A, Rn
        8'h24: begin
            acc <= acc + data_memory[operand];
            
            if (acc[7] == 1) begin
                psw[7] <= 1;
            end else begin
                psw[7] <= 0;
            end
            
            if (acc == 0) begin
                psw[6] <= 1;
            end else begin
                psw[6] <= 0;
            end
            
            if (acc[3] == 1) begin
                psw[4] <= 1;
            end else begin
                psw[4] <= 0;
            end
            
            pc_next <= pc_next + 2;
        end
        
        // ...
        
        default: begin
            pc_next <= pc_next + 1;
        end
    endcase
end

// Output ports
assign p1_0 = p1[0];
assign p1_1 = p1[1];
assign p1_2 = p1[2];
assign p1_3 = p1[3];
assign p1_4 = p1[4];
assign p1_5 = p1[5];
assign p1_6 = p1[6];
assign p1_7 = p1[7];

assign p2_0 = p2[0];
assign p2_1 = p2[1];
assign p2_2 = p2[2];
assign p2_3 = p2[3];
assign p2_4 = p2[4];
assign p2_5 = p2[5];
assign p2_6 = p2[6];
assign p2_7 = p2[7];

// Input/output ports
assign data_out = data_internal;

// Internal data memory
always @ (posedge clk) begin
    if (reset) begin
        data_internal <= 8'h00;
    end else begin
        case (ea[7:6])
            2'h00: data_internal <= data_memory[ea];
            2'h01: data_internal <= data_memory[p0 + ea[5:0]];
            2'h10: data_internal <= data_memory[p1 + ea[5:0]];
            2'h11: data_internal <= data_memory[ea];
        endcase
    end
end

// Internal address memory
always @ (posedge clk) begin
    if (reset) begin
        addr_internal <= 8'h00;
    end else begin
        case (ea[7:6])
            2'h00: addr_internal <= ea;
            2'h01: addr_internal <= p0 + ea[5:0];
            2'h10: addr_internal <= p1 + ea[5:0];
            2'h11: addr_internal <= ea;
        endcase
    end
end

// Internal program memory
always @ (posedge clk) begin
    if (reset) begin
        pc_next <= 8'h00;
    end else begin
        pc_next <= addr_internal;
    end
end

endmodule

以上代码只是一个简单的例子，实现了MC8051单片机的一些基本指令，并且包含了输入输出端口和访问数据存储器的逻辑。由于FPGA的资源限制，实际实现中可能需要进行优化和精简。