`timescale 1ns/1ns module data_select( input clk, input rst_n, input signed[7:0]a, input signed[7:0]b, input [1:0]select, output reg signed [8:0]c ); always @(posedge clk or negedge rst_n) begin if(!rst_n) c <= 9'd0; else begin case(select) 2'd0: c <= a; 2'd1: c <= b; 2'd2: c <= a + b; 2...