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coeff_gen_init_xblock.m
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coeff_gen_init_xblock.m
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% Center for Astronomy Signal Processing and Electronics Research %
% http://casper.berkeley.edu %
% Copyright (C) 2011 Suraj Gowda %
% %
% 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. %
% %
% 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. %
% %
% 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., %
% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function coeff_gen_init_xblock(Coeffs, coeff_bit_width, StepPeriod, bram_latency, coeffs_bram)
%% initialization scripts
if( ~isempty(find(real(Coeffs) > 1, 1)) || ~isempty(find(imag(Coeffs) > 1, 1)) ),
clog(['coeff_gen_init: [',num2str(Coeffs,4),'] not all in range [-1->1]'],'error');
error('coeff_gen_init: Coefficients specified are out of range');
return;
end
%% inports
rst = xInport('rst');
%% outports
w = xOutport('w');
%% diagram
if length(Coeffs) == 1,
%terminator
Terminator = xBlock(struct('source','Terminator', 'name', 'Terminator'), ...
[], ...
{rst}, ...
{});
%constant blocks
real_coeff = round(real(Coeffs(1)) * 2^(coeff_bit_width-2)) / 2^(coeff_bit_width-2);
imag_coeff = round(imag(Coeffs(1)) * 2^(coeff_bit_width-2)) / 2^(coeff_bit_width-2);
Coeffs
real_coeff
imag_coeff
% block: untitled/coeff_gen/Constant
Constant_out1 = xSignal;
Constant = xBlock(struct('source', 'Constant', 'name', 'Constant'), ...
struct('n_bits', coeff_bit_width, ...
'bin_pt', coeff_bit_width-2, ...
'const', real_coeff, ...
'explicit_period', 'on', ...
'period', 1), ...
{}, ...
{Constant_out1});
% block: untitled/coeff_gen/Constant1
Constant1_out1 = xSignal;
Constant1 = xBlock(struct('source', 'Constant', 'name', 'Constant1'), ...
struct('const', imag_coeff, ...
'n_bits', coeff_bit_width, ...
'bin_pt', coeff_bit_width-2, ...
'explicit_period', 'on', ...
'period', 1), ...
{}, ...
{Constant1_out1});
% block: twiddles_collections/coeff_gen/ri_to_c
ri_to_c = xBlock(struct('source', 'casper_library_misc/ri_to_c', 'name', 'ri_to_c'), ...
[], ...
{Constant_out1, Constant1_out1}, ...
{w});
else
vlen = length(Coeffs);
if( strcmp(coeffs_bram, 'on')),
mem = 'Block RAM';
else
mem = 'Distributed memory';
end
real_coeffs = round( real(Coeffs) * 2^(coeff_bit_width-2) ) / 2^(coeff_bit_width-2)
imag_coeffs = round( imag(Coeffs) * 2^(coeff_bit_width-2) ) / 2^(coeff_bit_width-2)
% block: twiddles_collections/coeff_gen/Counter
Counter_out1 = xSignal;
Counter = xBlock(struct('source', 'Counter', 'name', 'Counter'), ...
struct('n_bits', log2(vlen)+StepPeriod, ...
'cnt_type', 'Free Running', ...
'start_count', 0, ...
'cnt_by_val', 1, ...
'arith_type', 'Unsigned', ...
'bin_pt', 0, ...
'rst', 'on'), ...
{rst}, ...
{Counter_out1});
% block: twiddles_collections/coeff_gen/ROM
Slice_out1 = xSignal;
ROM_out1 = xSignal;
ROM = xBlock(struct('source', 'ROM', 'name', 'ROM'), ...
struct('depth', length(Coeffs), ...
'initVector', real_coeffs, ...
'distributed_mem', mem, ...
'latency', bram_latency, ...
'n_bits', coeff_bit_width, ...
'bin_pt', coeff_bit_width-2), ...
{Slice_out1}, ...
{ROM_out1});
% block: twiddles_collections/coeff_gen/ROM1
ROM1_out1 = xSignal;
ROM1 = xBlock(struct('source', 'ROM', 'name', 'ROM1'), ...
struct('depth', length(Coeffs), ...
'initVector', imag_coeffs, ...
'distributed_mem', mem, ...
'latency', bram_latency, ...
'n_bits', coeff_bit_width, ...
'bin_pt', coeff_bit_width-2), ...
{Slice_out1}, ...
{ROM1_out1});
% block: twiddles_collections/coeff_gen/Slice
Slice = xBlock(struct('source', 'Slice', 'name', 'Slice'), ...
struct('nbits', log2(vlen), ...
'mode', 'Upper Bit Location + Width', ...
'bit1', 0, ...
'base1', 'MSB of Input'), ...
{Counter_out1}, ...
{Slice_out1});
% block: twiddles_collections/coeff_gen/ri_to_c
ri_to_c = xBlock(struct('source', 'casper_library_misc/ri_to_c', 'name', 'ri_to_c'), ...
[], ...
{ROM_out1, ROM1_out1}, ...
{w});
end
end