From 747c165611c3016c997e092797bc20a4f900cdea Mon Sep 17 00:00:00 2001
From: "Pavel V. Shatov (Meister)" <meisterpaul1@yandex.ru>
Date: Sun, 12 Feb 2017 22:10:17 +0300
Subject: Initial commit of base point multiplier core for ECDSA curve P-384.

---
 rtl/lowlevel/generic/mac16_generic.v | 74 ++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 rtl/lowlevel/generic/mac16_generic.v

(limited to 'rtl/lowlevel/generic/mac16_generic.v')

diff --git a/rtl/lowlevel/generic/mac16_generic.v b/rtl/lowlevel/generic/mac16_generic.v
new file mode 100644
index 0000000..dc95645
--- /dev/null
+++ b/rtl/lowlevel/generic/mac16_generic.v
@@ -0,0 +1,74 @@
+//------------------------------------------------------------------------------
+//
+// 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
+//------------------------------------------------------------------------------
-- 
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