How to force manually in ModelSim one dada bus with value like sin(x)

In that case, you may create a module for the sine function:

module sine_generator (

input wire clk,

input wire reset,

output reg signed [10:0] sine_out

);

reg [6:0] index; // 7-bit index for 128 samples

reg signed [10:0] sine_lut [0:127]; // 128-point lookup table

initial begin

// Precompute sine values and load them into the LUT

sine_lut[0] = 0;

sine_lut[1] = 50;

sine_lut[2] = 100;

sine_lut[3] = 150;

sine_lut[4] = 200;

sine_lut[5] = 250;

// ... (continue with the full sine wave values up to 127)

sine_lut[127] = -50;

end

always @(posedge clk or posedge reset) begin

if (reset) begin

index <= 0;

sine_out <= 0;

end else begin

sine_out <= sine_lut[index]; // Output the sine value

index <= index + 1; // Increment index for next sample

end

end

endmodule