Subversion Repositories cryptosorter

//----------------------------------------------------------------------//
// The MIT License 
// 
// Copyright (c) 2008 Kermin Fleming, kfleming@mit.edu 
// 
// 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.
//----------------------------------------------------------------------//
import FIFO::*;
import RegFile::*;

interface BRAM#(type idx_type, type data_type);

  method Action read_req(idx_type idx);

  method ActionValue#(data_type) read_resp();

  method Action write(idx_type idx, data_type data);
  
endinterface


module mkBRAM#(Integer low, Integer high) 
  //interface:
              (BRAM#(idx_type, data_type)) 
  provisos
          (Bits#(idx_type, idx), 
           Bits#(data_type, data),
           Literal#(idx_type),
           Bounded#(idx_type));
           
  BRAM#(idx_type, data_type) m <- (valueof(data) == 0) ? 
                                  mkBRAM_Zero() :
                                  mkBRAM_NonZero(low, high);

  return m;
endmodule

module mkBRAM_NonZero#(Integer low, Integer high) 
  //interface:
              (BRAM#(idx_type, data_type)) 
  provisos
          (Bits#(idx_type, idx), 
           Bits#(data_type, data),
           Literal#(idx_type),
           Bounded#(idx_type));
  RegFile#(idx_type, data_type) arr <- mkRegFileFull();
  FIFO#(data_type) outfifo <- mkSizedFIFO(8);

  method Action read_req(idx_type idx);
    outfifo.enq(arr.sub(idx));
  endmethod

  method ActionValue#(data_type) read_resp();
    outfifo.deq();
    return outfifo.first();
  endmethod 

  method Action write(idx_type idx, data_type data);  
    arr.upd(idx, data);
  endmethod
endmodule

module mkBRAM_Zero
  //interface:
              (BRAM#(idx_type, data_type)) 
  provisos
          (Bits#(idx_type, idx), 
           Bits#(data_type, data),
           Literal#(idx_type));
  
  FIFO#(data_type) q <- mkSizedFIFO(8);

  method Action read_req(idx_type i);
     q.enq(?);
  endmethod

  method Action write(idx_type i, data_type d);
    noAction;
  endmethod

  method ActionValue#(data_type) read_resp();
    q.deq();
    return q.first();
  endmethod

endmodule

module mkBRAM_Full 
  //interface:
              (BRAM#(idx_type, data_type)) 
  provisos
          (Bits#(idx_type, idx), 
           Bits#(data_type, data),
           Literal#(idx_type),
           Bounded#(idx_type));


  BRAM#(idx_type, data_type) br <- mkBRAM(0, valueof(TExp#(idx)) - 1);

  return br;

endmodule