// 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 mult_wide (
    input  wire        CLK,
    input  wire [ 8:0] A0,
    input  wire [ 8:0] A1,
    input  wire [ 8:0] A2,
    input  wire [ 8:0] A3,
    input  wire [ 8:0] B0,
    input  wire [ 8:0] B1,
    input  wire [ 8:0] B2,
    input  wire [ 8:0] B3,
    input  wire [53:0] C,
    output wire [53:0] Z
);

    reg [8:0] ra0;
    always @(posedge CLK)
        ra0 <= A0;

    reg [8:0] rb0;
    always @(posedge CLK)
        rb0 <= B0;

    reg [8:0] rb2;
    always @(posedge CLK)
        rb2 <= B2;

    MULTADDSUB9X9WIDE # (
        .REGINPUTAB0("BYPASS"),
        .REGINPUTAB1("BYPASS"),
        .REGINPUTAB2("BYPASS"),
        .REGINPUTAB3("BYPASS"),
        .REGINPUTC("BYPASS"),
        .REGADDSUB("BYPASS"),
        .REGLOADC("BYPASS"),
        .REGLOADC2("BYPASS"),
        .REGPIPELINE("BYPASS"),
        .REGOUTPUT("REGISTER")
    ) mult (
        .A0 (ra0),
        .A1 (A1),
        .A2 (A2),
        .A3 (A3),
        .B0 (rb0),
        .B1 (B1),
        .B2 (rb2),
        .B3 (B3),
        .C  (C),
        .Z  (Z),

        .LOADC      (1'b0),
        .ADDSUB     (4'hF),
        .SIGNED     (1'b1),
    );

endmodule