diff options
Diffstat (limited to 'rtl/lowlevel/artix7/subtractor32_artix7.v')
| -rw-r--r-- | rtl/lowlevel/artix7/subtractor32_artix7.v | 188 |
1 files changed, 94 insertions, 94 deletions
diff --git a/rtl/lowlevel/artix7/subtractor32_artix7.v b/rtl/lowlevel/artix7/subtractor32_artix7.v index b46ac5c..7377781 100644 --- a/rtl/lowlevel/artix7/subtractor32_artix7.v +++ b/rtl/lowlevel/artix7/subtractor32_artix7.v @@ -1,94 +1,94 @@ -//------------------------------------------------------------------------------
-//
-// subtractor32_artix7.v
-// -----------------------------------------------------------------------------
-// Hardware (Artix-7 DSP48E1) 32-bit subtractor.
-//
-// 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 subtractor32_artix7
- (
- input clk,
- input [31: 0] a,
- input [31: 0] b,
- output [31: 0] d,
- input b_in,
- output b_out
- );
-
- //
- // Lower and higher parts of operand
- //
- wire [17: 0] bl = b[17: 0];
- wire [13: 0] bh = b[31:18];
-
- //
- // DSP48E1 Slice
- //
-
- /* Operation Mode */
- wire [ 3: 0] dsp48e1_alumode = 4'b0011;
- wire [ 6: 0] dsp48e1_opmode = 7'b0110011;
-
- /* Internal Product */
- wire [47: 0] p_int;
-
- dsp48e1_wrapper dsp_subtractor
- (
- .clk (clk),
-
- .ce (1'b1),
-
- .carry (b_in),
-
- .alumode (dsp48e1_alumode),
- .opmode (dsp48e1_opmode),
-
- .a ({{16{1'b0}}, bh}),
- .b (bl),
- .c ({{16{1'b0}}, a}),
-
- .p (p_int)
- );
-
- //
- // Output Mapping
- //
- assign d = p_int[31: 0];
- assign b_out = p_int[32];
-
-endmodule
-
-//------------------------------------------------------------------------------
-// End-of-File
-//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------ +// +// subtractor32_artix7.v +// ----------------------------------------------------------------------------- +// Hardware (Artix-7 DSP48E1) 32-bit subtractor. +// +// 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 subtractor32_artix7 + ( + input clk, + input [31: 0] a, + input [31: 0] b, + output [31: 0] d, + input b_in, + output b_out + ); + + // + // Lower and higher parts of operand + // + wire [17: 0] bl = b[17: 0]; + wire [13: 0] bh = b[31:18]; + + // + // DSP48E1 Slice + // + + /* Operation Mode */ + wire [ 3: 0] dsp48e1_alumode = 4'b0011; + wire [ 6: 0] dsp48e1_opmode = 7'b0110011; + + /* Internal Product */ + wire [47: 0] p_int; + + dsp48e1_wrapper dsp_subtractor + ( + .clk (clk), + + .ce (1'b1), + + .carry (b_in), + + .alumode (dsp48e1_alumode), + .opmode (dsp48e1_opmode), + + .a ({{16{1'b0}}, bh}), + .b (bl), + .c ({{16{1'b0}}, a}), + + .p (p_int) + ); + + // + // Output Mapping + // + assign d = p_int[31: 0]; + assign b_out = p_int[32]; + +endmodule + +//------------------------------------------------------------------------------ +// End-of-File +//------------------------------------------------------------------------------ |