Subversion Repositories astron_r2sdf_fft

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--
-- Copyright 2020
-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
-- 
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
-- 
--     http://www.apache.org/licenses/LICENSE-2.0
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-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
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Library ieee;
use IEEE.std_logic_1164.all;
 
package rTwoSDFPkg is
 
  -- Internal pipeline latencies and Z^(-1) pipeline settings for a stage in the rTwoSDF FFT
  -- Also used for other preallele and wideband FFT implementations (fft_lib)
  type t_fft_pipeline is record
    -- generics for rTwoSDFStage
    stage_lat      : natural;  -- = 1
    weight_lat     : natural;  -- = 1
    mul_lat        : natural;  -- = 3+1
    -- generics for rTwoBFStage
    bf_lat         : natural;  -- = 1
    -- generics for rTwoBF
    bf_use_zdly    : natural;  -- = 1
    bf_in_a_zdly   : natural;  -- = 0
    bf_out_d_zdly  : natural;  -- = 0
  end record;
 
  constant c_fft_pipeline   : t_fft_pipeline := (1, 1, 4, 1, 1, 0, 0);
 
end package rTwoSDFPkg;
 
package body rTwoSDFPkg IS
end rTwoSDFPkg;