From 25e338149fdb8e06c82d99600769a8498a85ef2c Mon Sep 17 00:00:00 2001
From: "Pavel V. Shatov (Meister)" <meisterpaul1@yandex.ru>
Date: Mon, 31 Oct 2016 00:14:51 +0300
Subject: Initial commit of base point multiplier core for ECDSA curve P-256.

---
 rtl/lowlevel/artix7/adder47_artix7.v | 91 ++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 rtl/lowlevel/artix7/adder47_artix7.v

(limited to 'rtl/lowlevel/artix7/adder47_artix7.v')

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
+//------------------------------------------------------------------------------
-- 
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