Initial commit

2026-11-04 11:32:14 +02:00
commit 3b63d221af
8 changed files with 520 additions and 0 deletions
@@ -0,0 +1,91 @@
+module FourDigitLEDdriver (
+    input  clk,
+    input  reset,
+    output an3,
+    an2,
+    an1,
+    an0,
+    output a,
+    b,
+    c,
+    d,
+    e,
+    f,
+    g,
+    dp
+);
+
+  wire clk_fb, clk_slow_raw, clk_slow, locked;
+
+  MMCME2_BASE #(
+      .BANDWIDTH         ("OPTIMIZED"),
+      .CLKIN1_PERIOD     (10.0),         // 100 MHz
+      .DIVCLK_DIVIDE     (1),
+      .CLKFBOUT_MULT_F   (6.0),          // VCO = 600 MHz
+      .CLKOUT1_DIVIDE    (120),          // 600/120 = 5 MHz
+      .CLKFBOUT_PHASE    (0.0),
+      .CLKOUT1_PHASE     (0.0),
+      .CLKOUT1_DUTY_CYCLE(0.5),
+      .STARTUP_WAIT      ("FALSE")
+  ) MMCME2_BASE_inst (
+      .CLKIN1(clk),
+      .CLKFBIN(clk_fb),
+      .CLKFBOUT(clk_fb),
+      .CLKOUT1(clk_slow_raw),
+      .LOCKED(locked),
+      .PWRDWN(1'b0),
+      .RST(reset)
+  );
+
+  BUFG bufg_slow (
+      .I(clk_slow_raw),
+      .O(clk_slow)
+  );
+
+  wire rst_int = reset | ~locked;
+
+  reg [3:0] state;
+  always @(posedge clk_slow or posedge rst_int) begin
+    if (rst_int) state <= 4'b1111;
+    else state <= state - 1;  // one step per 200 ns
+  end
+
+  reg [3:0] an;
+  reg [3:0] digit;
+
+  always @(*) begin
+    case (state)
+      4'b1110: an = 4'b0111;
+      4'b1010: an = 4'b1011;
+      4'b0110: an = 4'b1101;
+      4'b0010: an = 4'b1110;
+      default: an = 4'b1111;
+    endcase
+  end
+
+  always @(*) begin
+    case (state)
+      4'b0000, 4'b1111, 4'b1110, 4'b1101: digit = 4'h0;
+      4'b1100, 4'b1011, 4'b1010, 4'b1001: digit = 4'h1;
+      4'b1000, 4'b0111, 4'b0110, 4'b0101: digit = 4'h2;
+      default: digit = 4'h3;
+    endcase
+  end
+
+  wire [6:0] LED;
+  LEDdecoder LEDdecoder_inst (
+      .char(digit),
+      .LED (LED)
+  );
+
+  assign {an3, an2, an1, an0} = an;
+  assign a = ~LED[6];
+  assign b = ~LED[5];
+  assign c = ~LED[4];
+  assign d = ~LED[3];
+  assign e = ~LED[2];
+  assign f = ~LED[1];
+  assign g = ~LED[0];
+  assign dp = 1'b1;
+
+endmodule