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some progress in le mapping

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This commit is contained in:
Artur Swiderski 2020-10-29 01:19:20 +01:00
parent 53a95de62f
commit 42c5007cf6
4 changed files with 16 additions and 440 deletions
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60
techlibs/intel_le/cycloneiv/cells_sim.v
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@ -48,67 +48,7 @@ module cycloneiv_lcell_comb
parameter lpm_type = "cycloneiv_lcell_comb";
parameter sum_lutc_input = "datac";
reg cout_tmp;
reg combout_tmp;
reg [1:0] isum_lutc_input;
wire dataa_in;
wire datab_in;
wire datac_in;
wire datad_in;
wire cin_in;
// Simulation model of 4-input LUT
function lut4;
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];
lut4 = dataa ? s1[1] : s1[0];
end
endfunction // lut4
initial
begin
if (sum_lutc_input == "datac")
isum_lutc_input = 0;
else if (sum_lutc_input == "cin")
isum_lutc_input = 1;
else
begin
$display ("Error: Invalid sum_lutc_input specified\n");
$display ("Time: %0t Instance: %m", $time);
isum_lutc_input = 2;
end
end
always @(datad_in or datac_in or datab_in or dataa_in or cin_in)
begin
if (isum_lutc_input == 0) // datac
begin
combout_tmp = lut4(lut_mask, dataa_in, datab_in,
datac_in, datad_in);
end
else if (isum_lutc_input == 1) // cin
begin
combout_tmp = lut4(lut_mask, dataa_in, datab_in,
cin_in, datad_in);
end
cout_tmp = lut4(lut_mask, dataa_in, datab_in, cin_in, 'b0);
end
and (combout, combout_tmp, 1'b1) ;
and (cout, cout_tmp, 1'b1) ;
endmodule // cycloneiv_lcell_comb