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

-- 

-- 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;