// Copyright 2020-2022 F4PGA Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// 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.
//
// SPDX-License-Identifier: Apache-2.0

module dsp_t1_20x18x64 (
    input  [19:0] a_i,
    input  [17:0] b_i,
    input  [ 5:0] acc_fir_i,
    output [37:0] z_o,
    output [17:0] dly_b_o,

    input         clock_i,
    input         reset_i,

    input  [2:0]  feedback_i,
    input         load_acc_i,
    input         unsigned_a_i,
    input         unsigned_b_i,

    input  [2:0]  output_select_i,
    input         saturate_enable_i,
    input  [5:0]  shift_right_i,
    input         round_i,
    input         subtract_i,
    input         register_inputs_i
);

    parameter [19:0] COEFF_0 = 20'd0;
    parameter [19:0] COEFF_1 = 20'd0;
    parameter [19:0] COEFF_2 = 20'd0;
    parameter [19:0] COEFF_3 = 20'd0;

    QL_DSP2 # (
        .MODE_BITS          ({COEFF_3, COEFF_2, COEFF_1, COEFF_0})
    ) _TECHMAP_REPLACE_ (
        .a                  (a_i),
        .b                  (b_i),
        .acc_fir            (acc_fir_i),
        .z                  (z_o),
        .dly_b              (dly_b_o),

        .clk                (clock_i),
        .reset              (reset_i),

        .feedback           (feedback_i),
        .load_acc           (load_acc_i),
        .unsigned_a         (unsigned_a_i),
        .unsigned_b         (unsigned_b_i),

        .f_mode             (1'b0), // No fracturation
        .output_select      (output_select_i),
        .saturate_enable    (saturate_enable_i),
        .shift_right        (shift_right_i),
        .round              (round_i),
        .subtract           (subtract_i),
        .register_inputs    (register_inputs_i)
    );

endmodule

module dsp_t1_10x9x32 (
    input  [ 9:0] a_i,
    input  [ 8:0] b_i,
    input  [ 5:0] acc_fir_i,
    output [18:0] z_o,
    output [ 8:0] dly_b_o,

    (* clkbuf_sink *)
    input         clock_i,
    input         reset_i,

    input  [2:0]  feedback_i,
    input         load_acc_i,
    input         unsigned_a_i,
    input         unsigned_b_i,

    input  [2:0]  output_select_i,
    input         saturate_enable_i,
    input  [5:0]  shift_right_i,
    input         round_i,
    input         subtract_i,
    input         register_inputs_i
);

    parameter [9:0] COEFF_0 = 10'd0;
    parameter [9:0] COEFF_1 = 10'd0;
    parameter [9:0] COEFF_2 = 10'd0;
    parameter [9:0] COEFF_3 = 10'd0;

    wire [37:0] z;
    wire [17:0] dly_b;

    QL_DSP2 # (
        .MODE_BITS          ({10'd0, COEFF_3,
                              10'd0, COEFF_2,
                              10'd0, COEFF_1,
                              10'd0, COEFF_0})
    ) _TECHMAP_REPLACE_ (
        .a                  ({10'd0, a_i}),
        .b                  ({ 9'd0, b_i}),
        .acc_fir            (acc_fir_i),
        .z                  (z),
        .dly_b              (dly_b),

        .clk                (clock_i),
        .reset              (reset_i),

        .feedback           (feedback_i),
        .load_acc           (load_acc_i),
        .unsigned_a         (unsigned_a_i),
        .unsigned_b         (unsigned_b_i),

        .f_mode             (1'b1), // Enable fractuation, Use the lower half
        .output_select      (output_select_i),
        .saturate_enable    (saturate_enable_i),
        .shift_right        (shift_right_i),
        .round              (round_i),
        .subtract           (subtract_i),
        .register_inputs    (register_inputs_i)
    );

    assign z_o = z[18:0];
    assign dly_b_o = dly_b_o[8:0];

endmodule