yosys/techlibs/intel/cycloneive/cells_map.v

/*
 *  yosys -- Yosys Open SYnthesis Suite
 *
 *  Copyright (C) 2012  Claire Xenia Wolf <claire@yosyshq.com>
 *
 *  Permission to use, copy, modify, and/or distribute this software for any
 *  purpose with or without fee is hereby granted, provided that the above
 *  copyright notice and this permission notice appear in all copies.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
// > c60k28 (Viacheslav, VT) [at] yandex [dot] com
// > Intel FPGA technology mapping. User must first simulate the generated \
// > netlist before going to test it on board.

// Input buffer map
module \$__inpad (input I, output O);
   cycloneive_io_ibuf _TECHMAP_REPLACE_ (.o(O), .i(I), .ibar(1'b0));
endmodule

// Output buffer map
module \$__outpad (input I, output O);
   cycloneive_io_obuf _TECHMAP_REPLACE_ (.o(O), .i(I), .oe(1'b1));
endmodule

// LUT Map
/* 0 -> datac
 1 -> cin */
module \$lut (A, Y);
   parameter WIDTH  = 0;
   parameter LUT    = 0;
   (* force_downto *)
   input [WIDTH-1:0] A;
   output            Y;
   generate
      if (WIDTH == 1) begin
	 assign Y = ~A[0]; // Not need to spend 1 logic cell for such an easy function
      end else
        if (WIDTH == 2) begin
           cycloneive_lcell_comb #(.lut_mask({4{LUT}}),
                                   .sum_lutc_input("datac")) _TECHMAP_REPLACE_ (.combout(Y),
                                                                                .dataa(A[0]),
                                                                                .datab(A[1]),
                                                                                .datac(1'b1),
                                                                                .datad(1'b1));
        end else
          if(WIDTH == 3) begin
	     cycloneive_lcell_comb #(.lut_mask({2{LUT}}),
                                     .sum_lutc_input("datac")) _TECHMAP_REPLACE_ (.combout(Y),
                                                                                  .dataa(A[0]),
                                                                                  .datab(A[1]),
                                                                                  .datac(A[2]),
                                                                                  .datad(1'b1));
          end else
            if(WIDTH == 4) begin
	       cycloneive_lcell_comb #(.lut_mask(LUT),
                                       .sum_lutc_input("datac")) _TECHMAP_REPLACE_ (.combout(Y),
                                                                                    .dataa(A[0]),
                                                                                    .datab(A[1]),
                                                                                    .datac(A[2]),
                                                                                    .datad(A[3]));
            end else
	             wire _TECHMAP_FAIL_ = 1;
   endgenerate

endmodule