Using remotesyn and added NCO

rtl/toplevel/top_generic.v

@@ -0,0 +1,45 @@
+`timescale 1ns/1ps
+
+module top_generic(
+    input wire aclk,
+    input wire aresetn,
+
+    output wire led_green,
+    output wire led_red,
+
+    output wire[5:0] r2r
+);
+
+    `include "core/nco_q15_funcs.vh"
+
+    assign led_green = 1'b0;
+    assign led_red = 1'b0;
+
+    wire [15:0] sin_q15;
+    wire clk_en;
+    nco_q15 #(
+        .CLK_HZ(100_000_000),
+        .PHASE_BITS(16)
+    ) nco (
+        .clk    (aclk),
+        .rst_n  (aresetn),
+        .ftw_in (32'h0),
+        .ftw_we (1'b0),
+        .sin_q15(sin_q15),
+        .cos_q15(),
+        .clk_en (clk_en)
+    );
+
+    // sin_q15: signed Q15 in [-32768, +32767]
+    wire signed [15:0] s = sin_q15;
+    // Bias to 0..65535 and round before downscaling by 1024 (>>10)
+    wire [16:0] biased = s + 17'sd32768;           // 0..65535
+    wire [5:0] dac_code_next = biased[15:10];     // 0..63 (MSB=bit5)
+    // Register it at the sample rate (clk_en)
+    reg [5:0] dac_code;
+    always @(posedge aclk or negedge aresetn) begin
+        if (!aresetn) dac_code <= 6'd0;
+        else if (clk_en) dac_code <= dac_code_next;
+    end
+    assign r2r = dac_code;
+endmodule