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1 | module count_ones_32b ( |
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2 | input clk, |
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3 | input ce, |
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4 | input [31:0] x, |
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5 | output reg [5:0] num_ones = 0 |
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6 | ); |
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7 | |
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8 | reg [31:0] x_d = 0; |
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9 | |
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10 | always @(posedge clk) |
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11 | begin |
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12 | x_d <= x; |
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13 | end |
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14 | |
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15 | wire [2:0] cnt0, cnt1, cnt2, cnt3, cnt4; |
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16 | |
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17 | count_ones_6b c0(.x(x_d[ 5: 0]), .num_ones(cnt0)); |
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18 | count_ones_6b c1(.x(x_d[11: 6]), .num_ones(cnt1)); |
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19 | count_ones_6b c2(.x(x_d[17:12]), .num_ones(cnt2)); |
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20 | count_ones_6b c3(.x(x_d[23:18]), .num_ones(cnt3)); |
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21 | count_ones_6b c4(.x(x_d[29:24]), .num_ones(cnt4)); |
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22 | |
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23 | always @(posedge clk) |
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24 | begin |
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25 | num_ones <= cnt0 + cnt1 + cnt2 + cnt3 + cnt4 + x_d[30] + x_d[31]; |
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26 | end |
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27 | |
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28 | endmodule |
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29 | |
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30 | module count_ones_6b ( |
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31 | input [5:0] x, |
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32 | output reg [2:0] num_ones = 0 |
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33 | ); |
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34 | |
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35 | always @* begin |
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36 | case (x) |
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37 | 6'h00: num_ones = 0; |
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38 | 6'h01: num_ones = 1; |
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39 | 6'h02: num_ones = 1; |
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40 | 6'h03: num_ones = 2; |
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41 | 6'h04: num_ones = 1; |
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42 | 6'h05: num_ones = 2; |
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43 | 6'h06: num_ones = 2; |
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44 | 6'h07: num_ones = 3; |
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45 | 6'h08: num_ones = 1; |
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46 | 6'h09: num_ones = 2; |
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47 | 6'h0A: num_ones = 2; |
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48 | 6'h0B: num_ones = 3; |
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49 | 6'h0C: num_ones = 2; |
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50 | 6'h0D: num_ones = 3; |
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51 | 6'h0E: num_ones = 3; |
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52 | 6'h0F: num_ones = 4; |
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53 | 6'h10: num_ones = 1; |
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54 | 6'h11: num_ones = 2; |
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55 | 6'h12: num_ones = 2; |
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56 | 6'h13: num_ones = 3; |
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57 | 6'h14: num_ones = 2; |
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58 | 6'h15: num_ones = 3; |
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59 | 6'h16: num_ones = 3; |
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60 | 6'h17: num_ones = 4; |
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61 | 6'h18: num_ones = 2; |
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62 | 6'h19: num_ones = 3; |
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63 | 6'h1A: num_ones = 3; |
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64 | 6'h1B: num_ones = 4; |
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65 | 6'h1C: num_ones = 3; |
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66 | 6'h1D: num_ones = 4; |
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67 | 6'h1E: num_ones = 4; |
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68 | 6'h1F: num_ones = 5; |
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69 | 6'h20: num_ones = 1; |
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70 | 6'h21: num_ones = 2; |
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71 | 6'h22: num_ones = 2; |
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72 | 6'h23: num_ones = 3; |
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73 | 6'h24: num_ones = 2; |
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74 | 6'h25: num_ones = 3; |
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75 | 6'h26: num_ones = 3; |
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76 | 6'h27: num_ones = 4; |
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77 | 6'h28: num_ones = 2; |
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78 | 6'h29: num_ones = 3; |
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79 | 6'h2A: num_ones = 3; |
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80 | 6'h2B: num_ones = 4; |
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81 | 6'h2C: num_ones = 3; |
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82 | 6'h2D: num_ones = 4; |
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83 | 6'h2E: num_ones = 4; |
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84 | 6'h2F: num_ones = 5; |
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85 | 6'h30: num_ones = 2; |
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86 | 6'h31: num_ones = 3; |
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87 | 6'h32: num_ones = 3; |
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88 | 6'h33: num_ones = 4; |
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89 | 6'h34: num_ones = 3; |
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90 | 6'h35: num_ones = 4; |
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91 | 6'h36: num_ones = 4; |
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92 | 6'h37: num_ones = 5; |
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93 | 6'h38: num_ones = 3; |
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94 | 6'h39: num_ones = 4; |
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95 | 6'h3A: num_ones = 4; |
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96 | 6'h3B: num_ones = 5; |
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97 | 6'h3C: num_ones = 4; |
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98 | 6'h3D: num_ones = 5; |
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99 | 6'h3E: num_ones = 5; |
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100 | 6'h3F: num_ones = 6; |
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101 | default: num_ones = 0; |
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102 | endcase |
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103 | end |
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104 | |
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105 | endmodule |
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