synth_filter.m

Often it is necessary to add some logical control to a MATLAB algorithm to allow the generated hardw

%       AccelDSP 8.1.1 build 690 Production, compiled Apr 26 2006 
% 
%    THIS IS UNPUBLISHED, LICENSED SOFTWARE THAT IS THE CONFIDENTIAL 
%        AND PROPRIETARY PROPERTY OF XILINX OR ITS LICENSORS 
% 
%     Copyright(c) Xilinx, Inc., 2000-2006, All Rights Reserved. 
%     Reproduction or reuse, in any form, without the explicit written 
%     consent of Xilinx, Inc., is strictly prohibited. 

function FilterOut = synth_filter(FilterIn,coeff_in,load_en)

persistent tap_delay coeff
if isempty(tap_delay)
  coeff = zeros(1,32);
  tap_delay = zeros(1,length(coeff));
end

if load_en == 1
    coeff = coeff_in;
end

% Perform sum of products
FilterOut = tap_delay * coeff(end:-1:1)';

% Shift tap delay line
tap_delay = [tap_delay(2:length(coeff)) FilterIn];