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-//------------------------------------------------------------------------------
-//
-// mac16_generic.v
-// -----------------------------------------------------------------------------
-// Generic 16-bit multiplier and 47-bit accumulator.
-//
-// Authors: Pavel Shatov
-//
-// Copyright (c) 2016, NORDUnet A/S
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-// - Redistributions of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright notice,
-// this list of conditions and the following disclaimer in the documentation
-// and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may be
-// used to endorse or promote products derived from this software without
-// specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-// POSSIBILITY OF SUCH DAMAGE.
-//
-//------------------------------------------------------------------------------
-
-module mac16_generic
- (
- input clk, // clock
- input clr, // clear accumulator (active-high)
- input ce, // enable clock (active-high)
- input [15: 0] a, // operand input
- input [15: 0] b, // operand input
- output [46: 0] s // sum output
- );
-
- //
- // Multiplier
- //
- wire [31: 0] p = {{16{1'b0}}, a} * {{16{1'b0}}, b};
- wire [46: 0] p_ext = {{15{1'b0}}, p};
-
- //
- // Accumulator
- //
- reg [46: 0] s_int;
-
- always @(posedge clk)
- //
- if (ce) s_int <= clr ? p_ext : p_ext + s_int;
-
- //
- // Output
- //
- assign s = s_int;
-
-endmodule
-
-
-//------------------------------------------------------------------------------
-// End-of-File
-//------------------------------------------------------------------------------