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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* 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
// > Achronix eFPGA technology sim models. User must first simulate the generated \
// > netlist before going to test it on board/custom chip.
// > Changelog: 1) Removed unused VCC/GND modules
// > 2) Altera comments here (?). Removed.
// > 3) Reusing LUT sim model, removed wrong wires and parameters.
module PADIN (output padout, input padin);
assign padout = padin;
endmodule
module PADOUT (output padout, input padin, input oe);
assign padout = padin;
assign oe = oe;
endmodule
module LUT4 (output dout,
input din0, din1, din2, din3);
parameter [15:0] lut_function = 16'hFFFF;
reg combout_rt;
wire dataa_w;
wire datab_w;
wire datac_w;
wire datad_w;
assign dataa_w = din0;
assign datab_w = din1;
assign datac_w = din2;
assign datad_w = din3;
function lut_data;
input [15:0] mask;
input dataa, datab, datac, datad;
reg [7:0] s3;
reg [3:0] s2;
reg [1:0] s1;
begin
s3 = datad ? mask[15:8] : mask[7:0];
s2 = datac ? s3[7:4] : s3[3:0];
s1 = datab ? s2[3:2] : s2[1:0];
lut_data = dataa ? s1[1] : s1[0];
end
endfunction
always @(dataa_w or datab_w or datac_w or datad_w) begin
combout_rt = lut_data(lut_function, dataa_w, datab_w,
datac_w, datad_w);
end
assign dout = combout_rt & 1'b1;
endmodule
module DFF (output q,
input d, ck);
reg q;
always @(posedge ck)
q <= d;
endmodule
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