cvw/wally-pipelined/src/mmu/decoder.sv

///////////////////////////////////////////
// decoder.sv
//
// Written: tfleming@hmc.edu & jtorrey@hmc.edu 7 April 2021
// Modified:
//
// Purpose: Binary encoding to one-hot decoder
//
// A component of the Wally configurable RISC-V project.
//
// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
///////////////////////////////////////////

`include "wally-config.vh"

module decoder #(parameter BINARY_BITS = 3) (
  input  [BINARY_BITS-1:0] binary,
  output [(2**BINARY_BITS)-1:0] onehot
);

  // *** Double check whether this synthesizes as expected
  //     -- Ben @ May 4: only warning is that "signed to unsigned assignment occurs"; that said, I haven't checked the netlists
  assign onehot = 1 << binary;

endmodule