// © IBM Corp. 2020
// Licensed under the Apache License, Version 2.0 (the "License"), as modified by
// the terms below; you may not use the files in this repository except in
// compliance with the License as modified.
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
//
// Modified Terms:
//
//    1) For the purpose of the patent license granted to you in Section 3 of the
//    License, the "Work" hereby includes implementations of the work of authorship
//    in physical form.
//
//    2) Notwithstanding any terms to the contrary in the License, any licenses
//    necessary for implementation of the Work that are available from OpenPOWER
//    via the Power ISA End User License Agreement (EULA) are explicitly excluded
//    hereunder, and may be obtained from OpenPOWER under the terms and conditions
//    of the EULA.
//
// Unless required by applicable law or agreed to in writing, the reference design
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
// for the specific language governing permissions and limitations under the License.
//
// Additional rights, including the ability to physically implement a softcore that
// is compliant with the required sections of the Power ISA Specification, are
// available at no cost under the terms of the OpenPOWER Power ISA EULA, which can be
// obtained (along with the Power ISA) here: https://openpowerfoundation.org.

// input phase is importent
// (change X (B) by switching xor/xnor )

`timescale 1 ns / 1 ns

`include "tri_a2o.vh"

module lq_agen_csmux(
   sum_0,
   sum_1,
   ci_b,
   sum
);

input [0:7]     sum_0;		// after xor
input [0:7]     sum_1;
input           ci_b;

output [0:7]    sum;

wire [0:7]      sum0_b;

wire [0:7]      sum1_b;

wire            int_ci;

wire            int_ci_t;

wire            int_ci_b;

//assign int_ci = (~ci_b);
tri_inv int_ci_0 (.y(int_ci), .a(ci_b));

//assign int_ci_t = (~ci_b);
tri_inv int_ci_t_0 (.y(int_ci_t), .a(ci_b));

//assign int_ci_b = (~int_ci_t);
tri_inv int_ci_b_0 (.y(int_ci_b), .a(int_ci_t));

//assign sum0_b[0] = (~(sum_0[0] & int_ci_b));
tri_nand2 #(.WIDTH(8)) sum0_b_0 (.y(sum0_b[0:7]), .a(sum_0[0:7]), .b({8{int_ci_b}}));

//assign sum1_b[0] = (~(sum_1[0] & int_ci));
tri_nand2 #(.WIDTH(8)) sum1_b_0 (.y(sum1_b[0:7]), .a(sum_1[0:7]), .b({8{int_ci}}));

//assign sum[0] = (~(sum0_b[0] & sum1_b[0]));
tri_nand2 #(.WIDTH(8)) sum0 (.y(sum[0:7]), .a(sum0_b[0:7]), .b(sum1_b[0:7]));


endmodule