用verilog实现PLL模块产生3.2GHz和6.4GHz的时

PLL（Phase Locked Loop）是一种常用的时钟生成电路，可以将输入时钟的频率倍频或分频，并且可以实现锁相环功能，使得输出时钟与参考时钟保持同步。以下是一种可能的Verilog代码实现：

module pll (
  input CLKIN, // 输入时钟
  output CLKOUT0, // 输出时钟0
  output CLKOUT1, // 输出时钟1
  output LOCK // 锁定信号
);

parameter CLKIN_PERIOD = 10; // 输入时钟周期为10ns
parameter CLKOUT0_PERIOD = 0.3125; // 输出时钟0周期为312.5ps
parameter CLKOUT1_PERIOD = 0.15625; // 输出时钟1周期为156.25ps
parameter Kp = 0.1; // 比例增益
parameter Ki = 0.01; // 积分增益
parameter Kd = 0.001; // 微分增益

reg [31:0] phase_reg0, phase_reg1;
reg [31:0] freq_reg0, freq_reg1;
reg [31:0] int_reg0, int_reg1;
reg [31:0] div_reg0, div_reg1;
wire [31:0] phase_diff0, phase_diff1;
wire [31:0] freq_diff0, freq_diff1;
wire [31:0] int_diff0, int_diff1;
wire [31:0] div_diff0, div_diff1;
wire reset;
wire locked;

// 相位检测器模块
phase_detector #(
  .CLKIN_PERIOD(CLKIN_PERIOD),
  .CLKOUT0_PERIOD(CLKOUT0_PERIOD),
  .CLKOUT1_PERIOD(CLKOUT1_PERIOD)
) phase_detector_inst (
  .CLKIN(CLKIN),
  .CLKOUT0(CLKOUT0),
  .CLKOUT1(CLKOUT1),
  .PHASE_DIFF0(phase_diff0),
  .PHASE_DIFF1(phase_diff1)
);

// 频率检测器模块
frequency_detector #(
  .CLKIN_PERIOD(CLKIN_PERIOD),
  .CLKOUT0_PERIOD(CLKOUT0_PERIOD),
  .CLKOUT1_PERIOD(CLKOUT1_PERIOD)
) frequency_detector_inst (
  .CLKIN(CLKIN),
  .CLKOUT0(CLKOUT0),
  .CLKOUT1(CLKOUT1),
  .FREQ_DIFF0(freq_diff0),
  .FREQ_DIFF1(freq_diff1)
);

// 积分模块
integrator #(
  .CLKIN_PERIOD(CLKIN_PERIOD),
  .CLKOUT0_PERIOD(CLKOUT0_PERIOD),
  .CLKOUT1_PERIOD(CLKOUT1_PERIOD)
) integrator_inst (
  .CLKIN(CLKIN),
  .CLKOUT0(CLKOUT0),
  .CLKOUT1(CLKOUT1),
  .INT_DIFF0(int_diff0),
  .INT_DIFF1(int_diff1)
);

// 微分模块
differentiator #(
  .CLKIN_PERIOD(CLKIN_PERIOD),
  .CLKOUT0_PERIOD(CLKOUT0_PERIOD),
  .CLKOUT1_PERIOD(CLKOUT1_PERIOD)
) differentiator_inst (
  .CLKIN(CLKIN),
  .CLKOUT0(CLKOUT0),
  .CLKOUT1(CLKOUT1),
  .DIV_DIFF0(div_diff0),
  .DIV_DIFF1(div_diff1)
);

// 锁相环控制器模块
loop_filter #(
  .CLKIN_PERIOD(CLKIN_PERIOD),
  .CLKOUT0_PERIOD(CLKOUT0_PERIOD),
  .CLKOUT1_PERIOD(CLKOUT1_PERIOD),
  .Kp(Kp),
  .Ki(Ki),
  .Kd(Kd)
) loop_filter_inst (
  .CLKIN(CLKIN),
  .CLKOUT0(CLKOUT0),
  .CLKOUT1(CLKOUT1),
  .PHASE_DIFF0(phase_diff0),
  .PHASE_DIFF1(phase_diff1),
  .FREQ_DIFF0(freq_diff0),
  .FREQ_DIFF1(freq_diff1),
  .INT_DIFF0(int_diff0),
  .INT_DIFF1(int_diff1),
  .DIV_DIFF0(div_diff0),
  .DIV_DIFF1(div_diff1),
  .RESET(reset),
  .LOCK(locked)
);

// 分频器模块，将输出时钟分频为1/2或1/4
always @(posedge CLKOUT0) begin
  div_reg0 <= div_reg0 + 1;
  if (div_reg0 == 0) begin
    phase_reg0 <= phase_reg0 + 1;
    if (phase_reg0 == 0) begin
      CLKOUT0 <= ~CLKOUT0; // 产生50%占空比的时钟
    end
  end
end

always @(posedge CLKOUT1) begin
  div_reg1 <= div_reg1 + 1;
  if (div_reg1 == 0) begin
    phase_reg1 <= phase_reg1 + 1;
    if (phase_reg1 == 0) begin
      CLKOUT1 <= ~CLKOUT1; // 产生50%占空比的时钟
    end
  end
end

// 频率、相位、积分、微分计数器
always @(posedge CLKIN) begin
  if (locked) begin
    freq_reg0 <= freq_reg0 + int_reg0 - div_reg0;
    freq_reg1 <= freq_reg1 + int_reg1 - div_reg1;
    phase_reg0 <= phase_reg0 + freq_reg0;
    phase_reg1 <= phase_reg1 + freq_reg1;
    int_reg0 <= int_reg0 + int_diff0;
    int_reg1 <= int_reg1 + int_diff1;
    div_reg0 <= div_reg0 + div_diff0;
    div_reg1 <= div_reg1 + div_diff1;
  end
end

// 外部复位端口
always @(posedge CLKIN) begin
  if (reset) begin
    phase_reg0 <= 0;
    phase_reg1 <= 0;
    freq_reg0 <= 0;
    freq_reg1 <= 0;
    int_reg0 <= 0;
    int_reg1 <= 0;
    div_reg0 <= 0;
    div_reg1 <= 0;
    CLKOUT0 <= 0;
    CLKOUT1 <= 0;
  end
end

endmodule

该代码使用了相位检测器、频率检测器、积分器、微分器和锁相环控制器等模块实现PLL功能，同时还包含了分频器模块将输出时钟分频为1/2或1/4。需要注意的是，PLL的参数需要根据具体的应用场景进行调整，比如增益系数等。