From a62861f3c91e88020d2c54e6500f431b9edde1d8 Mon Sep 17 00:00:00 2001
From: "Pavel V. Shatov (Meister)" <meisterpaul1@yandex.ru>
Date: Sat, 1 Jul 2017 20:11:20 +0300
Subject: Added generic/vendor-specific primitive selector for simulation.

---
 src/rtl/pe/generic/subtractor32_generic.v | 71 +++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 src/rtl/pe/generic/subtractor32_generic.v

(limited to 'src/rtl/pe/generic/subtractor32_generic.v')

diff --git a/src/rtl/pe/generic/subtractor32_generic.v b/src/rtl/pe/generic/subtractor32_generic.v
new file mode 100644
index 0000000..3e78715
--- /dev/null
+++ b/src/rtl/pe/generic/subtractor32_generic.v
@@ -0,0 +1,71 @@
+//------------------------------------------------------------------------------
+//
+// subtractor32_generic.v
+// -----------------------------------------------------------------------------
+// Generic 32-bit subtractor w/ clock enable.
+//
+// Authors: Pavel Shatov
+//
+// Copyright (c) 2016-2017, 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_generic
+	(
+		input					clk,
+		input					ce,
+		input		[31: 0]	a,
+		input		[31: 0]	b,
+		output	[31: 0]	d,
+		input					b_in,
+		output				b_out	
+	);
+
+
+		//
+		// Difference
+		//
+	reg	[32: 0]	d_int;
+	
+	always @(posedge clk)
+		if (ce) d_int <= {1'b0, a} - {1'b0, b} - {{32{1'b0}}, b_in};
+	
+	
+		//
+		// Output
+		//
+	assign d = d_int[31:0];
+	assign b_out = d_int[32];
+	
+
+endmodule
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
-- 
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