mirror of https://github.com/YosysHQ/yosys.git
76 lines
3.4 KiB
Verilog
76 lines
3.4 KiB
Verilog
/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2012 Claire Xenia Wolf <claire@yosyshq.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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// > c60k28 (Viacheslav, VT) [at] yandex [dot] com
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// > Intel FPGA technology mapping. User must first simulate the generated \
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// > netlist before going to test it on board.
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// Input buffer map
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module \$__inpad (input I, output O);
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cycloneive_io_ibuf _TECHMAP_REPLACE_ (.o(O), .i(I), .ibar(1'b0));
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endmodule
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// Output buffer map
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module \$__outpad (input I, output O);
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cycloneive_io_obuf _TECHMAP_REPLACE_ (.o(O), .i(I), .oe(1'b1));
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endmodule
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// LUT Map
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/* 0 -> datac
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1 -> cin */
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module \$lut (A, Y);
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parameter WIDTH = 0;
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parameter LUT = 0;
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(* force_downto *)
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input [WIDTH-1:0] A;
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output Y;
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generate
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if (WIDTH == 1) begin
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assign Y = ~A[0]; // Not need to spend 1 logic cell for such an easy function
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end else
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if (WIDTH == 2) begin
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cycloneive_lcell_comb #(.lut_mask({4{LUT}}),
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.sum_lutc_input("datac")) _TECHMAP_REPLACE_ (.combout(Y),
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.dataa(A[0]),
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.datab(A[1]),
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.datac(1'b1),
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.datad(1'b1));
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end else
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if(WIDTH == 3) begin
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cycloneive_lcell_comb #(.lut_mask({2{LUT}}),
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.sum_lutc_input("datac")) _TECHMAP_REPLACE_ (.combout(Y),
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.dataa(A[0]),
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.datab(A[1]),
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.datac(A[2]),
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.datad(1'b1));
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end else
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if(WIDTH == 4) begin
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cycloneive_lcell_comb #(.lut_mask(LUT),
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.sum_lutc_input("datac")) _TECHMAP_REPLACE_ (.combout(Y),
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.dataa(A[0]),
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.datab(A[1]),
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.datac(A[2]),
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.datad(A[3]));
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end else
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wire _TECHMAP_FAIL_ = 1;
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endgenerate
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endmodule
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