diff options
author | Pavel V. Shatov (Meister) <meisterpaul1@yandex.ru> | 2017-07-01 20:11:20 +0300 |
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committer | Pavel V. Shatov (Meister) <meisterpaul1@yandex.ru> | 2017-07-01 20:11:20 +0300 |
commit | a62861f3c91e88020d2c54e6500f431b9edde1d8 (patch) | |
tree | c9e9b1ff4790df8070bc6da0bb4e90f4a0cef134 /src/rtl/pe/generic/subtractor32_generic.v | |
parent | 73fd79329a415514027abb976b76c890845aab0f (diff) |
Added generic/vendor-specific primitive selector for simulation.
Diffstat (limited to 'src/rtl/pe/generic/subtractor32_generic.v')
-rw-r--r-- | src/rtl/pe/generic/subtractor32_generic.v | 71 |
1 files changed, 71 insertions, 0 deletions
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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