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https://github.com/ehw-fit/ariths-gen.git
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53 lines
2.1 KiB
Verilog
53 lines
2.1 KiB
Verilog
module xor_gate(input a, input b, output out);
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assign out = a ^ b;
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endmodule
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module and_gate(input a, input b, output out);
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assign out = a & b;
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endmodule
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module or_gate(input a, input b, output out);
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assign out = a | b;
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endmodule
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module ha(input [0:0] a, input [0:0] b, output [0:0] ha_xor0, output [0:0] ha_and0);
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xor_gate xor_gate_ha_xor0(.a(a[0]), .b(b[0]), .out(ha_xor0));
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and_gate and_gate_ha_and0(.a(a[0]), .b(b[0]), .out(ha_and0));
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endmodule
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module fa(input [0:0] a, input [0:0] b, input [0:0] cin, output [0:0] fa_xor1, output [0:0] fa_or0);
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wire [0:0] fa_xor0;
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wire [0:0] fa_and0;
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wire [0:0] fa_and1;
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xor_gate xor_gate_fa_xor0(.a(a[0]), .b(b[0]), .out(fa_xor0));
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and_gate and_gate_fa_and0(.a(a[0]), .b(b[0]), .out(fa_and0));
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xor_gate xor_gate_fa_xor1(.a(fa_xor0[0]), .b(cin[0]), .out(fa_xor1));
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and_gate and_gate_fa_and1(.a(fa_xor0[0]), .b(cin[0]), .out(fa_and1));
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or_gate or_gate_fa_or0(.a(fa_and0[0]), .b(fa_and1[0]), .out(fa_or0));
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endmodule
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module s_rca4(input [3:0] a, input [3:0] b, output [4:0] s_rca4_out);
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wire [0:0] s_rca4_ha_xor0;
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wire [0:0] s_rca4_ha_and0;
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wire [0:0] s_rca4_fa1_xor1;
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wire [0:0] s_rca4_fa1_or0;
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wire [0:0] s_rca4_fa2_xor1;
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wire [0:0] s_rca4_fa2_or0;
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wire [0:0] s_rca4_fa3_xor1;
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wire [0:0] s_rca4_fa3_or0;
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wire [0:0] s_rca4_xor0;
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wire [0:0] s_rca4_xor1;
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ha ha_s_rca4_ha_out(.a(a[0]), .b(b[0]), .ha_xor0(s_rca4_ha_xor0), .ha_and0(s_rca4_ha_and0));
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fa fa_s_rca4_fa1_out(.a(a[1]), .b(b[1]), .cin(s_rca4_ha_and0[0]), .fa_xor1(s_rca4_fa1_xor1), .fa_or0(s_rca4_fa1_or0));
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fa fa_s_rca4_fa2_out(.a(a[2]), .b(b[2]), .cin(s_rca4_fa1_or0[0]), .fa_xor1(s_rca4_fa2_xor1), .fa_or0(s_rca4_fa2_or0));
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fa fa_s_rca4_fa3_out(.a(a[3]), .b(b[3]), .cin(s_rca4_fa2_or0[0]), .fa_xor1(s_rca4_fa3_xor1), .fa_or0(s_rca4_fa3_or0));
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xor_gate xor_gate_s_rca4_xor0(.a(a[3]), .b(b[3]), .out(s_rca4_xor0));
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xor_gate xor_gate_s_rca4_xor1(.a(s_rca4_xor0[0]), .b(s_rca4_fa3_or0[0]), .out(s_rca4_xor1));
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assign s_rca4_out[0] = s_rca4_ha_xor0[0];
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assign s_rca4_out[1] = s_rca4_fa1_xor1[0];
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assign s_rca4_out[2] = s_rca4_fa2_xor1[0];
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assign s_rca4_out[3] = s_rca4_fa3_xor1[0];
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assign s_rca4_out[4] = s_rca4_xor1[0];
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endmodule |