srt除法器verilog

以下是一个基于Verilog的SRT除法器的实现，其中包括了除数和被除数的输入，商和余数的输出，以及状态机的控制逻辑。

module srt_divider(dividend, divisor, quotient, remainder, clk, rst);

parameter WIDTH = 8; // 定义数据宽度

input [WIDTH-1:0] dividend; // 被除数
input [WIDTH-1:0] divisor; // 除数
output reg [WIDTH-1:0] quotient; // 商
output reg [WIDTH-1:0] remainder; // 余数
input clk, rst; // 时钟和复位信号

reg [WIDTH-1:0] A, Q, M; // 寄存器A、Q、M
reg [2*WIDTH-1:0] MQ; // 寄存器MQ
reg [2*WIDTH:0] count; // 计数器
reg [WIDTH:0] shift; // 移位寄存器
reg [1:0] state; // 状态机状态

// 状态机状态定义
parameter IDLE = 2'b00;
parameter SHIFT = 2'b01;
parameter SUBTRACT = 2'b10;

always @(posedge clk or posedge rst) begin
    if (rst) begin
        A <= 0;
        Q <= 0;
        M <= 0;
        MQ <= {dividend, divisor};
        count <= 0;
        shift <= 0;
        state <= IDLE;
    end else begin
        case (state)
            IDLE: begin
                A <= MQ[2*WIDTH-1:WIDTH];
                Q <= MQ[WIDTH-1:0];
                M <= MQ[2*WIDTH-1:WIDTH];
                quotient <= 0;
                remainder <= 0;
                count <= 0;
                shift <= 0;
                state <= SHIFT;
            end
            SHIFT: begin
                if (shift == WIDTH) begin
                    state <= SUBTRACT;
                end else begin
                    shift <= shift + 1;
                    A <= {A, Q[WIDTH-1]};
                    Q <= {Q[WIDTH-2:0], 0};
                end
            end
            SUBTRACT: begin
                if (A[WIDTH-1:0] >= divisor) begin
                    A <= A - divisor;
                    Q[WIDTH-1] <= 1;
                end else begin
                    Q[WIDTH-1] <= 0;
                end
                count <= count + 1;
                if (count == WIDTH) begin
                    remainder <= A[WIDTH-1:0];
                    quotient <= Q;
                    state <= IDLE;
                end else begin
                    A <= {A[WIDTH-2:0], 0};
                    Q <= {Q[WIDTH-2:0], 0};
                    shift <= shift - 1;
                    state <= SHIFT;
                end
            end
        endcase
    end
end

endmodule