diff options
| author | Pavel V. Shatov (Meister) <meisterpaul1@yandex.ru> | 2016-12-04 23:07:58 +0300 |
|---|---|---|
| committer | Pavel V. Shatov (Meister) <meisterpaul1@yandex.ru> | 2016-12-04 23:07:58 +0300 |
| commit | a66be3237f5e9f4b6144cec093b047acfd70ffc6 (patch) | |
| tree | 51e3d9ca5498de7a2adf36c74674144c07a179e3 /rtl/lowlevel/generic/mac16_generic.v | |
| parent | 25e338149fdb8e06c82d99600769a8498a85ef2c (diff) | |
Added README.md with core description, API details, etc
Added previously forgotten generic replacements for vendor-specific primitives
Minor clean up of comments
Slightly reduced power consumption
Diffstat (limited to 'rtl/lowlevel/generic/mac16_generic.v')
| -rw-r--r-- | rtl/lowlevel/generic/mac16_generic.v | 74 |
1 files changed, 74 insertions, 0 deletions
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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