From fbcbd4218e2711da279d8097620a5b26637bf45b Mon Sep 17 00:00:00 2001
From: "Pavel V. Shatov (Meister)" <meisterpaul1@yandex.ru>
Date: Wed, 19 Dec 2018 15:27:04 +0300
Subject: Added primitives with clock enable ports. Added primitives from
ModExp.
---
lowlevel/generic/adder32_ce_generic.v | 68 ++++++++++++++++++++++++++++++
lowlevel/generic/subtractor32_ce_generic.v | 68 ++++++++++++++++++++++++++++++
2 files changed, 136 insertions(+)
create mode 100644 lowlevel/generic/adder32_ce_generic.v
create mode 100644 lowlevel/generic/subtractor32_ce_generic.v
(limited to 'lowlevel/generic')
diff --git a/lowlevel/generic/adder32_ce_generic.v b/lowlevel/generic/adder32_ce_generic.v
new file mode 100644
index 0000000..329bcbf
--- /dev/null
+++ b/lowlevel/generic/adder32_ce_generic.v
@@ -0,0 +1,68 @@
+//------------------------------------------------------------------------------
+//
+// adder32_ce_generic.v
+// -----------------------------------------------------------------------------
+// Generic 32-bit adder w/ clock enable.
+//
+// Authors: Pavel Shatov
+//
+// Copyright (c) 2016, 2018 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_ce_generic
+ (
+ input clk, // clock
+ input ce, // clock enable
+ 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
+ );
+
+ //
+ // Sum
+ //
+ reg [32: 0] s_int;
+
+ always @(posedge clk)
+ if (ce) s_int <= {1'b0, a} + {1'b0, b} + {{32{1'b0}}, c_in};
+
+ //
+ // Output
+ //
+ assign s = s_int[31:0];
+ assign c_out = s_int[32];
+
+endmodule
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
diff --git a/lowlevel/generic/subtractor32_ce_generic.v b/lowlevel/generic/subtractor32_ce_generic.v
new file mode 100644
index 0000000..da97e76
--- /dev/null
+++ b/lowlevel/generic/subtractor32_ce_generic.v
@@ -0,0 +1,68 @@
+//------------------------------------------------------------------------------
+//
+// subtractor32_ce_generic.v
+// -----------------------------------------------------------------------------
+// Generic 32-bit subtractor w/ clock enable.
+//
+// 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_ce_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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