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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.
*
*/
module VCC (output V);
assign V = 1'b1;
endmodule // VCC
module GND (output G);
assign G = 1'b0;
endmodule // GND
/* Altera MAX10 devices Input Buffer Primitive */
module PADIN (output padout, input padin);
assign padout = padin;
endmodule // fiftyfivenm_io_ibuf
/* Altera MAX10 devices Output Buffer Primitive */
module PADOUT (output padout, input padin, input oe);
assign padout = padin;
assign oe = oe;
endmodule // fiftyfivenm_io_obuf
/* Altera MAX10 4-input non-fracturable LUT Primitive */
module LUT4 (output dout,
input din0, din1, din2, din3);
/* Internal parameters which define the behaviour
of the LUT primitive.
lut_mask define the lut function, can be expressed in 16-digit bin or hex.
sum_lutc_input define the type of LUT (combinational | arithmetic).
dont_touch for retiming || carry options.
lpm_type for WYSIWYG */
parameter lut_function = 16'hFFFF;
//parameter dont_touch = "off";
//parameter lpm_type = "fiftyfivenm_lcell_comb";
//parameter sum_lutc_input = "datac";
reg [1:0] lut_type;
reg cout_rt;
reg combout_rt;
wire dataa_w;
wire datab_w;
wire datac_w;
wire datad_w;
wire cin_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
initial begin
/*if (sum_lutc_input == "datac")*/ lut_type = 0;
/*else
if (sum_lutc_input == "cin") lut_type = 1;
else begin
$error("Error in sum_lutc_input. Parameter %s is not a valid value.\n", sum_lutc_input);
$finish();
end*/
end
always @(dataa_w or datab_w or datac_w or datad_w or cin_w) begin
if (lut_type == 0) begin // logic function
combout_rt = lut_data(lut_function, dataa_w, datab_w,
datac_w, datad_w);
end
else if (lut_type == 1) begin // arithmetic function
combout_rt = lut_data(lut_function, dataa_w, datab_w,
cin_w, datad_w);
end
cout_rt = lut_data(lut_function, dataa_w, datab_w, cin_w, 'b0);
end
assign dout = combout_rt & 1'b1;
//assign cout = cout_rt & 1'b1;
endmodule // fiftyfivenm_lcell_comb
/* Altera MAX10 D Flip-Flop Primitive */
// TODO: Implement advanced simulation functions
module dffeas ( output q,
input d, clk, clrn, prn, ena,
input asdata, aload, sclr, sload );
parameter power_up="dontcare";
parameter is_wysiwyg="false";
reg q;
always @(posedge clk)
q <= d;
endmodule
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