twiddle_coeff_1_draw.m

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%                                                                             %
%   Center for Astronomy Signal Processing and Electronics Research           %
%   http://casper.berkeley.edu                                                %      
%   Copyright (C) 2011 Suraj Gowda    Hong Chen                               %
%                                                                             %
%   This program is free software; you can redistribute it and/or modify      %
%   it under the terms of the GNU General Public License as published by      %
%   the Free Software Foundation; either version 2 of the License, or         %
%   (at your option) any later version.                                       %
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%   This program is distributed in the hope that it will be useful,           %
%   but WITHOUT ANY WARRANTY; without even the implied warranty of            %
%   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             %
%   GNU General Public License for more details.                              %
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%   You should have received a copy of the GNU General Public License along   %
%   with this program; if not, write to the Free Software Foundation, Inc.,   %
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function twiddle_coeff_1_draw(a_re, a_im, b_re, b_im, sync, ...
    a_re_out, a_im_out, bw_re_out, bw_im_out, sync_out, ...
    FFTSize, input_bit_width, negate_latency)
%% diagram

negate_out1 = xSignal;
convert_out1 = xSignal;
counter_out1 = xSignal;
sel = xSignal;
im_sel = xSignal;
delay3_out1 = xSignal;
delay4_out1 = xSignal;
b_re_bram_del = xSignal;
b_im_bram_del = xSignal;

% delay a_re by total delay 
a_re_del = xBlock(struct('source', 'Delay', 'name', 'a_re_del'), ...
                       struct('latency', negate_latency, 'reg_retiming', 'on'), {a_re}, {a_re_out});

% delay a_im by total delay
a_im_del = xBlock(struct('source', 'Delay', 'name', 'a_im_del'), ...
                       struct('latency', negate_latency, 'reg_retiming', 'on'), {a_im}, {a_im_out});

% delay output sync pulse by total latency
sync_delay = xBlock(struct('source', 'Delay', 'name', 'sync_delay'), ...
                       struct('latency', negate_latency), {sync}, {sync_out});

% negate bw_re to multiply by -j
negate = xBlock(struct('source', 'Negate', 'name', 'negate'), ...
                       struct('n_bits', input_bit_width, 'bin_pt', input_bit_width-1, 'overflow', 'Saturate', ...
                              'latency', negate_latency), ...
                       {b_re}, {bw_im_out});

% delay b_im to match bw_im_out
xBlock( struct('source', 'Delay', 'name', 'bw_im_del'), ...
        struct('latency', negate_latency'), {b_im}, {bw_re_out} );

end