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DDS module and test bench finished

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Imants Pulkstenis
2020-04-01 21:35:27 +03:00
parent c8581dbe68
commit 1598022c70
6 changed files with 246 additions and 67 deletions
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ps4/table_gen.m
+37 -17
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@@ -5,11 +5,11 @@
% Module name - DDS (direct digital synthesis)
%
% Detailed module description:
% This file generates lock up table with SIN values
% This file generates lock up table with SIN and COS values
%
% Revision:
% A - initial design
% B -
% B - add COS output
% C -
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -18,30 +18,50 @@ word_lenght = 8;
table_size = 4; % 2^n
x = linspace(0, (2*pi - 2*pi/2^table_size) , 2^table_size);
sin_x = sin(x);
sin_x = round(sin_x * 2^word_lenght) / 2^word_lenght;
sin_x = round(sin_x * 2^word_lenght) / 2^word_lenght; % round values
%% Print values in hex
hex = [];
cos_x = cos(x);
cos_x = round(cos_x * 2^word_lenght) / 2^word_lenght; % round values
%% Print values in HEX
hex_sin = [];
hex_cos = [];
for i=1:2^table_size
a = sfi(sin_x(i),word_lenght,word_lenght-2);
hex = [hex; a.bin];
a = sfi(sin_x(i),word_lenght,word_lenght-2);
b = sfi(cos_x(i),word_lenght,word_lenght-2);
hex_sin = [hex_sin; a.bin];
hex_cos = [hex_cos; b.bin];
end
hex,
%hex_sin,
%hex_cos,
fid = fopen('lookuptable.v', 'wt');
fprintf(fid, 'module lookuptable(\n');
fprintf(fid, '\tinput [%d :0] in,\n',word_lenght-1);
fprintf(fid, '\toutput reg [%d :0] out);\n',word_lenght-1);
fprintf(fid, 'module lookuptable #( parameter phase_width = %d, data_width = %d)(\n', table_size, word_lenght);
fprintf(fid, '\tinput [phase_width - 1 :0] phase,\n');
fprintf(fid, '\toutput reg [data_width - 1 :0] sin,\n');
fprintf(fid, '\toutput reg [data_width - 1 :0] cos);\n');
fprintf(fid, 'reg [%d :0] out = %d''h0; \n', word_lenght-1,word_lenght);
% fprintf(fid, 'reg [%d :0] sin = %d''h0; \n', word_lenght-1,word_lenght);
fprintf(fid, 'always@* begin\n');
fprintf(fid, 'case (in)\n');
fprintf(fid, 'case (phase[phase_width - 1 : 0])\n');
for i=1:length(hex)
temp = hex(i,1:word_lenght);
fprintf(fid, '\t%d''d%d : out <= %d''b%s;\n',word_lenght, i-1 ,word_lenght, hex(i,1:word_lenght) );
for i=1:length(hex_sin)
temp = hex_sin(i,1:word_lenght);
fprintf(fid, '\t%d''d%d : sin[data_width - 1 : 0] <= %d''b%s;\n',table_size, i-1 ,word_lenght, hex_sin(i,1:word_lenght) );
end
fprintf(fid, '\tdefault : out <= %d''b%s;\n ',word_lenght, hex(1,1:word_lenght) );
fprintf(fid, '\tdefault : sin[data_width - 1 : 0] <= %d''b%s;\n ',word_lenght, hex_sin(1,1:word_lenght) );
fprintf(fid, 'endcase\n');
fprintf(fid, 'end\n');
fprintf(fid, ' \n');
fprintf(fid, 'always@* begin\n');
fprintf(fid, 'case (phase[phase_width - 1 : 0])\n');
for i=1:length(hex_cos)
temp = hex_cos(i,1:word_lenght);
fprintf(fid, '\t%d''d%d : cos[data_width - 1 : 0] <= %d''b%s;\n',table_size, i-1 , word_lenght, hex_cos(i,1:word_lenght) );
end
fprintf(fid, '\tdefault : cos[data_width - 1 : 0] <= %d''b%s;\n ',word_lenght, hex_cos(1,1:word_lenght) );
fprintf(fid, 'endcase\n');
fprintf(fid, 'end\n');
fprintf(fid, 'endmodule');