10 files changed, 836 insertions, 0 deletions
diff --git a/rtl/lowlevel/adder32_wrapper.v b/rtl/lowlevel/adder32_wrapper.v
new file mode 100644
index 0000000..ebfd8ce
--- /dev/null
+++ b/rtl/lowlevel/adder32_wrapper.v
@@ -0,0 +1,73 @@
+//------------------------------------------------------------------------------
+//
+// adder32_wrapper.v
+// -----------------------------------------------------------------------------
+// Wrapper for 32-bit adder.
+//
+// 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 adder32_wrapper
+	(
+		input					clk,		// clock
+		input		[31: 0]	a,			// operand input
+		input		[31: 0]	b,			// operand input
+		output	[31: 0]	s,			// sum output
+		input					c_in,		// carry input
+		output				c_out		// carry output
+	);
+	
+		//
+		// Include Primitive Selector
+		//
+`include "ecdsa_lowlevel_settings.v"
+
+
+		//
+		// Instantiate Vendor/Generic Primitive
+		//
+	`ADDER32_PRIMITIVE adder32_inst
+	(
+		.clk(clk),
+		.a(a),
+		.b(b),
+		.s(s),
+		.c_in(c_in),
+		.c_out(c_out)
+	);
+	
+
+endmodule
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
diff --git a/rtl/lowlevel/adder47_wrapper.v b/rtl/lowlevel/adder47_wrapper.v
new file mode 100644
index 0000000..1a0a18e
--- /dev/null
+++ b/rtl/lowlevel/adder47_wrapper.v
@@ -0,0 +1,69 @@
+//------------------------------------------------------------------------------
+//
+// adder47_wrapper.v
+// -----------------------------------------------------------------------------
+// Wrapper for 47-bit adder.
+//
+// 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 adder47_wrapper
+	(
+		input					clk,		// clock
+		input		[46: 0]	a,			// operand input
+		input		[46: 0]	b,			// operand input
+		output	[46: 0]	s			// sum output
+	);
+	
+		//
+		// Include Primitive Selector
+		//
+`include "ecdsa_lowlevel_settings.v"
+
+
+		//
+		// Instantiate Vendor/Generic Primitive
+		//
+	`ADDER47_PRIMITIVE adder47_inst
+	(
+		.clk(clk),
+		.a(a),
+		.b(b),
+		.s(s)
+	);
+	
+	
+endmodule
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
diff --git a/rtl/lowlevel/artix7/adder32_artix7.v b/rtl/lowlevel/artix7/adder32_artix7.v
new file mode 100644
index 0000000..5f9ba79
--- /dev/null
+++ b/rtl/lowlevel/artix7/adder32_artix7.v
@@ -0,0 +1,96 @@
+//------------------------------------------------------------------------------
+//
+// adder32_artix7.v
+// -----------------------------------------------------------------------------
+// Hardware (Artix-7 DSP48E1) 32-bit adder.
+//
+// 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 adder32_artix7
+	(
+		input					clk,		// clock
+		input		[31: 0]	a,			// operand input
+		input		[31: 0]	b,			// operand input
+		output	[31: 0]	s,			// sum output
+		input					c_in,		// carry input
+		output				c_out		// carry output
+	);
+	
+		//
+		// 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'b0000;
+	wire	[ 6: 0]	dsp48e1_opmode		= 7'b0110011;
+		
+		/* Internal Product */
+	wire	[47: 0]	p_int;
+
+	dsp48e1_wrapper dsp_adder
+	(
+		.clk			(clk),
+		
+		.ce			(1'b1),
+		
+		.carry		(c_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 s 		= p_int[31: 0];
+	assign c_out	= p_int[32];
+
+
+endmodule
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
diff --git a/rtl/lowlevel/artix7/adder47_artix7.v b/rtl/lowlevel/artix7/adder47_artix7.v
new file mode 100644
index 0000000..00566e4
--- /dev/null
+++ b/rtl/lowlevel/artix7/adder47_artix7.v
@@ -0,0 +1,91 @@
+//------------------------------------------------------------------------------
+//
+// adder47_artix7.v
+// -----------------------------------------------------------------------------
+// Hardware (Artix-7 DSP48E1) 47-bit adder.
+//
+// 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 adder47_artix7
+	(
+		input					clk,		// clock
+		input		[46: 0]	a,			// operand input
+		input		[46: 0]	b,			// operand input
+		output	[46: 0]	s			// sum output
+	);
+	
+		//
+		// Lower and higher parts of operand
+		//
+	wire	[17: 0]	bl = b[17: 0];
+	wire	[28: 0]	bh = b[46:18];
+
+		//
+		// DSP48E1 Slice
+		//
+		
+		/* Operation Mode */
+	wire	[ 3: 0]	dsp48e1_alumode	= 4'b0000;
+	wire	[ 6: 0]	dsp48e1_opmode		= 7'b0110011;
+		
+		/* Internal Product */
+	wire	[47: 0]	p_int;
+
+	dsp48e1_wrapper dsp_adder
+	(
+		.clk			(clk),
+		
+		.ce			(1'b1),
+		
+		.carry		(1'b0),
+		
+		.alumode		(dsp48e1_alumode),
+		.opmode		(dsp48e1_opmode),
+		
+		.a				({1'b0, bh}),
+		.b				(bl),
+		.c				({1'b0, a}),
+		
+		.p				(p_int)
+	);
+
+		//
+		// Output Mapping
+		//
+	assign s 		= p_int[46: 0];
+
+endmodule
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
diff --git a/rtl/lowlevel/artix7/dsp48e1_wrapper.v b/rtl/lowlevel/artix7/dsp48e1_wrapper.v
new file mode 100644
index 0000000..9f29ac1
--- /dev/null
+++ b/rtl/lowlevel/artix7/dsp48e1_wrapper.v
@@ -0,0 +1,159 @@
+//------------------------------------------------------------------------------
+//
+// dsp48e1_wrapper.v
+// -----------------------------------------------------------------------------
+// Hardware (Artix-7 DSP48E1) tile wrapper.
+//
+// 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 dsp48e1_wrapper
+	(
+		input					clk,
+		
+		input					ce,
+		
+		input		[ 6: 0]	opmode,
+		input		[ 3: 0]	alumode,
+		
+		input					carry,
+		
+		input		[29: 0]	a,
+		input		[17: 0]	b,
+		input		[47: 0]	c,
+		
+		output	[47: 0]	p
+	);
+	
+	
+		//
+		// Tile instantiation
+		//
+	DSP48E1 #
+	(
+		.AREG						(0),
+		.BREG						(0),
+		.CREG						(0),
+		.DREG						(1),
+		.MREG						(0),
+		.PREG						(1),
+		.ADREG					(0),
+		
+		.ACASCREG				(0),
+		.BCASCREG				(0),
+		.ALUMODEREG				(0),
+		.INMODEREG				(0),
+		.OPMODEREG				(0),
+		.CARRYINREG				(0),
+		.CARRYINSELREG			(0),
+
+		.A_INPUT					("DIRECT"),
+		.B_INPUT					("DIRECT"),
+		
+		.USE_DPORT				("FALSE"),
+		.USE_MULT				("DYNAMIC"),
+		.USE_SIMD				("ONE48"),
+
+		.USE_PATTERN_DETECT	("NO_PATDET"),
+		.SEL_PATTERN			("PATTERN"),
+		.SEL_MASK				("MASK"),
+		.PATTERN					(48'h000000000000),
+		.MASK						(48'h3fffffffffff),
+		.AUTORESET_PATDET		("NO_RESET")
+	)
+	DSP48E1_inst
+	(
+		.CLK					(clk),
+
+		.RSTA					(1'b0),
+		.RSTB					(1'b0),
+		.RSTC					(1'b0),
+		.RSTD					(1'b0),
+		.RSTM					(1'b0),
+		.RSTP					(1'b0),
+
+		.RSTCTRL				(1'b0),
+		.RSTINMODE			(1'b0),
+		.RSTALUMODE			(1'b0),
+		.RSTALLCARRYIN		(1'b0),
+
+		.CEA1					(1'b0),
+		.CEA2					(1'b0),
+		.CEB1					(1'b0),
+		.CEB2					(1'b0),
+		.CEC					(1'b0),
+		.CED					(1'b0),
+		.CEM					(1'b0),
+		.CEP					(ce),
+		.CEAD					(1'b0),
+		.CEALUMODE			(1'b0),
+		.CEINMODE			(1'b0),
+
+		.CECTRL				(1'b0),
+		.CECARRYIN			(1'b0),
+
+		.A						(a),
+		.B						(b),
+		.C						(c),
+		.D						({25{1'b1}}),
+		.P						(p),
+
+		.CARRYIN				(carry),
+		.CARRYOUT			(),
+		.CARRYINSEL			(3'b000),
+
+		.CARRYCASCIN		(1'b0),
+		.CARRYCASCOUT		(),
+
+		.PATTERNDETECT		(),
+		.PATTERNBDETECT	(),
+
+		.OPMODE				(opmode),
+		.ALUMODE				(alumode),
+		.INMODE				(5'b00000),
+
+		.MULTSIGNIN			(1'b0),
+		.MULTSIGNOUT		(),
+
+		.UNDERFLOW			(),
+		.OVERFLOW			(),
+
+		.ACIN					(30'd0),
+		.BCIN					(18'd0),
+		.PCIN					(48'd0),
+
+		.ACOUT				(),
+		.BCOUT				(),
+		.PCOUT				()
+  );
+
+endmodule
diff --git a/rtl/lowlevel/artix7/mac16_artix7.v b/rtl/lowlevel/artix7/mac16_artix7.v
new file mode 100644
index 0000000..09a2413
--- /dev/null
+++ b/rtl/lowlevel/artix7/mac16_artix7.v
@@ -0,0 +1,90 @@
+//------------------------------------------------------------------------------
+//
+// mac16_artix7.v
+// -----------------------------------------------------------------------------
+// Hardware (Artix-7 DSP48E1) 16-bit multiplier and 48-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_artix7
+	(
+		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
+	);
+	
+			
+		//
+		// DSP48E1 Slice
+		//
+		
+		/* Operation Mode */
+	wire	[ 3: 0]	dsp48e1_alumode	= 4'b0000;
+	wire	[ 6: 0]	dsp48e1_opmode		= {2'b01, clr, 4'b0101};
+		
+		/* Internal Product */
+	wire	[47: 0]	p_int;
+
+	dsp48e1_wrapper dsp_adder
+	(
+		.clk			(clk),
+		
+		.ce			(ce),
+		
+		.carry		(1'b0),
+		
+		.alumode		(dsp48e1_alumode),
+		.opmode		(dsp48e1_opmode),
+		
+		.a				({{14{1'b0}}, a}),
+		.b				({{ 2{1'b0}}, b}),
+		.c				({48{1'b0}}),
+		
+		.p				(p_int)
+	);
+
+		//
+		// Output Mapping
+		//
+	assign s = p_int[46:0];
+	
+
+endmodule
+
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
diff --git a/rtl/lowlevel/artix7/subtractor32_artix7.v b/rtl/lowlevel/artix7/subtractor32_artix7.v
new file mode 100644
index 0000000..b46ac5c
--- /dev/null
+++ b/rtl/lowlevel/artix7/subtractor32_artix7.v
@@ -0,0 +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
+//------------------------------------------------------------------------------
diff --git a/rtl/lowlevel/ecdsa_lowlevel_settings.v b/rtl/lowlevel/ecdsa_lowlevel_settings.v
new file mode 100644
index 0000000..8f95e2f
--- /dev/null
+++ b/rtl/lowlevel/ecdsa_lowlevel_settings.v
@@ -0,0 +1,17 @@
+`define USE_VENDOR_PRIMITIVES
+
+`ifdef USE_VENDOR_PRIMITIVES
+
+`define MAC16_PRIMITIVE				mac16_artix7
+`define ADDER32_PRIMITIVE			adder32_artix7
+`define ADDER47_PRIMITIVE			adder47_artix7
+`define SUBTRACTOR32_PRIMITIVE	subtractor32_artix7
+
+`else
+
+`define MAC16_PRIMITIVE				mac16_generic
+`define ADDER32_PRIMITIVE			adder32_generic
+`define ADDER47_PRIMITIVE			adder47_generic
+`define SUBTRACTOR32_PRIMITIVE	subtractor32_generic
+
+`endif
diff --git a/rtl/lowlevel/mac16_wrapper.v b/rtl/lowlevel/mac16_wrapper.v
new file mode 100644
index 0000000..b91e518
--- /dev/null
+++ b/rtl/lowlevel/mac16_wrapper.v
@@ -0,0 +1,75 @@
+//------------------------------------------------------------------------------
+//
+// mac16_wrapper.v
+// -----------------------------------------------------------------------------
+// Wrapper for 16-bit multiplier and 48-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_wrapper
+	(
+		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
+	);
+	
+			
+		//
+		// Include Primitive Selector
+		//
+`include "ecdsa_lowlevel_settings.v"
+
+
+		//
+		// Instantiate Vendor/Generic Primitive
+		//
+	`MAC16_PRIMITIVE mac16_inst
+	(
+		.clk(clk),
+		.clr(clr),
+		.ce(ce),
+		.a(a),
+		.b(b),
+		.s(s)
+	);
+	
+
+endmodule
+
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
diff --git a/rtl/lowlevel/subtractor32_wrapper.v b/rtl/lowlevel/subtractor32_wrapper.v
new file mode 100644
index 0000000..3c7e5e9
--- /dev/null
+++ b/rtl/lowlevel/subtractor32_wrapper.v
@@ -0,0 +1,72 @@
+//------------------------------------------------------------------------------
+//
+// subtractor32_wrapper.v
+// -----------------------------------------------------------------------------
+// Wrapper for 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_wrapper
+	(
+		input					clk,
+		input		[31: 0]	a,
+		input		[31: 0]	b,
+		output	[31: 0]	d,
+		input					b_in,
+		output				b_out	
+	);
+
+			//
+		// Include Primitive Selector
+		//
+`include "ecdsa_lowlevel_settings.v"
+
+
+		//
+		// Instantiate Vendor/Generic Primitive
+		//
+	`SUBTRACTOR32_PRIMITIVE subtractor32_inst
+	(
+		.clk(clk),
+		.a(a),
+		.b(b),
+		.d(d),
+		.b_in(b_in),
+		.b_out(b_out)
+	);
+
+endmodule
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------