Rev | Line | |
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[6151] | 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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[6152] | 5 | output reg [5:0] num_ones = 0 |
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[6151] | 6 | ); |
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| 7 | |
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[6152] | 8 | reg [31:0] x_d = 0; |
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[6151] | 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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[6152] | 32 | output reg [2:0] num_ones = 0 |
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[6151] | 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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