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minor cleanup and fixes

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This commit is contained in:
Artur Swiderski 2020-10-24 00:02:05 +02:00
parent 41f83c19fd
commit 309689da5b
11 changed files with 76 additions and 355 deletions
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81
techlibs/intel_le/cycloneiv/cells_sim.v
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@ -1,4 +1,4 @@
/*
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
@ -41,22 +41,23 @@ endmodule // cycloneiv_io_obuf
/* Altera Cyclone IV LUT Primitive */
module cycloneiv_lcell_comb
(output combout, cout,
input dataa, datab, datac, datad,
input datae, dataf, datag, cin);
input dataa, datab, datac, datad, cin);
parameter lut_mask = 16'hFFFF;
parameter dont_touch = "off";
parameter lpm_type = "cycloneiv_lcell_comb";
parameter sum_lutc_input = "datac";
// Internal variables
reg cout_tmp;
reg combout_tmp;
reg [1:0] isum_lutc_input;
// Independent output for fragmented LUTs
wire output_0, output_1, output_2, output_3;
// Extended mode uses mux to define the output
wire mux_0, mux_1;
// Input for hold the shared LUT mode value
wire shared_lut_alm;
wire dataa_in;
wire datab_in;
wire datac_in;
wire datad_in;
wire cin_in;
// Simulation model of 4-input LUT
function lut4;
@ -73,35 +74,41 @@ module cycloneiv_lcell_comb
end
endfunction // lut4
// Simulation model of 5-input LUT
function lut5;
input [31:0] mask; // wp-01003.pdf, page 3: "a 5-LUT can be built with two 4-LUTs and a multiplexer.
input dataa, datab, datac, datad, datae;
reg upper_lut_value;
reg lower_lut_value;
begin
upper_lut_value = lut4(mask[31:16], dataa, datab, datac, datad);
lower_lut_value = lut4(mask[15:0], dataa, datab, datac, datad);
lut5 = (datae) ? upper_lut_value : lower_lut_value;
end
endfunction // lut5
// Simulation model of 6-input LUT
function lut6;
input [63:0] mask;
input dataa, datab, datac, datad, datae, dataf;
reg upper_lut_value;
reg lower_lut_value;
reg out_0, out_1, out_2, out_3;
begin
upper_lut_value = lut5(mask[63:32], dataa, datab, datac, datad, datae);
lower_lut_value = lut5(mask[31:0], dataa, datab, datac, datad, datae);
lut6 = (dataf) ? upper_lut_value : lower_lut_value;
end
endfunction // lut6
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
assign {mask_a, mask_b, mask_c, mask_d} = {lut_mask[15:0], lut_mask[31:16], lut_mask[47:32], lut_mask[63:48]};
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