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dbrochart |
######################################################################
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#### ####
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#### iteration.py ####
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#### ####
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#### This file is part of the turbo decoder IP core project ####
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#### http://www.opencores.org/projects/turbocodes/ ####
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#### ####
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#### Author(s): ####
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#### - David Brochart(dbrochart@opencores.org) ####
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#### ####
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#### All additional information is available in the README.txt ####
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#### file. ####
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#### ####
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######################################################################
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#### ####
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#### Copyright (C) 2005 Authors ####
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#### ####
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#### This source file may be used and distributed without ####
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#### restriction provided that this copyright statement is not ####
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#### removed from the file and that any derivative work contains ####
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#### the original copyright notice and the associated disclaimer. ####
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#### ####
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#### This source file is free software; you can redistribute it ####
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#### and/or modify it under the terms of the GNU Lesser General ####
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#### Public License as published by the Free Software Foundation; ####
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#### either version 2.1 of the License, or (at your option) any ####
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#### later version. ####
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#### ####
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#### This source is distributed in the hope that it will be ####
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#### useful, but WITHOUT ANY WARRANTY; without even the implied ####
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#### warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ####
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#### PURPOSE. See the GNU Lesser General Public License for more ####
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#### details. ####
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#### ####
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#### You should have received a copy of the GNU Lesser General ####
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#### Public License along with this source; if not, download it ####
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#### from http://www.opencores.org/lgpl.shtml ####
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#### ####
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######################################################################
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from misc import delayer
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from interleaver import interleaver
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from permut import zPermut, abPermut
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from sova import sova
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from myhdl import Signal, intbv, instances
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def iteration(clk, rst, flipflop, a, b, y1, y2, y1Int, y2Int, zin, zout, aDec, bDec, aDel, bDel, y1Del, y2Del, y1IntDel, y2IntDel, l = 20, m = 10, q = 8, p = 48, r = 5, n = 4, delay = 0):
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""" Decoding iteration top level (two SOVAs).
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l -- first trellis length
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m -- second trellis length
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q -- accumulated distance width
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p -- interleaver frame size in bit couples
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r -- extrinsic information width
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n -- systematic data width
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delay -- additional delay created by the previous iterations
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clk, rst -- in : clock and negative reset
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flipflop -- in : permutation control signal (on/off)
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a, b, y1, y2, y1Int, y2Int -- in : received decoder signals
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zin -- in : extrinsic information from the previous iteration
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zout -- out : extrinsic information to the next iteration
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aDec, bDec -- out : decoded signals
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aDel, bDel, y1Del, y2Del, y1IntDel, y2IntDel -- out : delayed received decoder signals
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"""
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# Signal declarations:
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aDecInt = Signal(bool(0))
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bDecInt = Signal(bool(0))
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zoutInt1 = [Signal(intbv(0, 0, 2**r)) for i in range(4)]
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zout1Perm = [Signal(intbv(0, 0, 2**r)) for i in range(4)]
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aDel1 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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bDel1 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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aDel2 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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bDel2 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y1Del1 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y2Del1 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y1Del2 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y2Del2 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y1IntDel1 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y2IntDel1 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y1IntDel3 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y2IntDel3 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y1IntDel4 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y2IntDel4 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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aDel3 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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bDel3 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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abDel1Perm = [Signal(intbv(0, -(2**(n-1)), 2**(n-1))) for i in range(2)]
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abDel1PermInt = [Signal(intbv(0, -(2**(n-1)), 2**(n-1))) for i in range(2)]
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y1Del3 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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y2Del3 = Signal(intbv(0, -(2**(n-1)), 2**(n-1)))
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zout1 = [Signal(intbv(0, 0, 2**r)) for i in range(4)]
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zout2 = [Signal(intbv(0, 0, 2**r)) for i in range(4)]
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zout2Int = [Signal(intbv(0, 0, 2**r)) for i in range(4)]
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# Instanciations:
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sova_i0 = sova(clk, rst, a, b, y1, y2, zin, zout1, aDec, bDec, l, m, q, r, n)
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zPermut_i0 = zPermut(flipflop, zout1, zout1Perm, (l + m + 2 + delay + 1) % 2)
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interleaver_i0 = interleaver(clk, rst, zout1Perm, zoutInt1, p, l + m + 2 + delay, 0, 2**r, 4, 0)
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delayer_i0 = delayer(clk, rst, a, aDel1, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i1 = delayer(clk, rst, b, bDel1, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i2 = delayer(clk, rst, y1, y1Del1, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i3 = delayer(clk, rst, y2, y2Del1, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i4 = delayer(clk, rst, y1Int, y1IntDel1, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i5 = delayer(clk, rst, y2Int, y2IntDel1, (l + m), -(2**(n-1)), 2**(n-1))
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abPermut_i0 = abPermut(flipflop, aDel1, bDel1, abDel1Perm, (l + m + 2 + delay + 1) % 2)
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interleaver_i1 = interleaver(clk, rst, abDel1Perm, abDel1PermInt, p, l + m + 2 + delay, -(2**(n-1)), 2**(n-1), 2, 0)
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delayer_i6 = delayer(clk, rst, aDel1, aDel2, p, -(2**(n-1)), 2**(n-1))
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delayer_i7 = delayer(clk, rst, bDel1, bDel2, p, -(2**(n-1)), 2**(n-1))
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delayer_i8 = delayer(clk, rst, y1Del1, y1Del2, p, -(2**(n-1)), 2**(n-1))
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delayer_i9 = delayer(clk, rst, y2Del1, y2Del2, p, -(2**(n-1)), 2**(n-1))
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sova_i1 = sova(clk, rst, abDel1PermInt[1], abDel1PermInt[0], y1IntDel1, y2IntDel1, zoutInt1, zout2, aDecInt, bDecInt, l, m, q, r, n)
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deinterleaver_i0 = interleaver(clk, rst, zout2, zout2Int, p, 2 * (l + m + 2) + p + delay, 0, 2**r, 4, 1)
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zPermut_i1 = zPermut(flipflop, zout2Int, zout, (2 * (l + m + 2) + p + delay) % 2)
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delayer_i10 = delayer(clk, rst, aDel2, aDel3, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i11 = delayer(clk, rst, bDel2, bDel3, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i12 = delayer(clk, rst, y1Del2, y1Del3, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i13 = delayer(clk, rst, y2Del2, y2Del3, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i14 = delayer(clk, rst, y1IntDel1, y1IntDel3, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i15 = delayer(clk, rst, y2IntDel1, y2IntDel3, (l + m), -(2**(n-1)), 2**(n-1))
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delayer_i16 = delayer(clk, rst, aDel3, aDel, p, -(2**(n-1)), 2**(n-1))
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delayer_i17 = delayer(clk, rst, bDel3, bDel, p, -(2**(n-1)), 2**(n-1))
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delayer_i18 = delayer(clk, rst, y1Del3, y1Del, p, -(2**(n-1)), 2**(n-1))
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delayer_i19 = delayer(clk, rst, y2Del3, y2Del, p, -(2**(n-1)), 2**(n-1))
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delayer_i20 = delayer(clk, rst, y1IntDel3, y1IntDel4, p, -(2**(n-1)), 2**(n-1))
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delayer_i21 = delayer(clk, rst, y2IntDel3, y2IntDel4, p, -(2**(n-1)), 2**(n-1))
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delayer_i22 = delayer(clk, rst, y1IntDel4, y1IntDel, p, -(2**(n-1)), 2**(n-1))
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delayer_i23 = delayer(clk, rst, y2IntDel4, y2IntDel, p, -(2**(n-1)), 2**(n-1))
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return sova_i0, zPermut_i0, interleaver_i0, delayer_i0, delayer_i1, delayer_i2, delayer_i3, delayer_i4, delayer_i5, abPermut_i0, interleaver_i1, delayer_i6, delayer_i7, delayer_i8, delayer_i9, sova_i1, deinterleaver_i0, zPermut_i1, delayer_i10, delayer_i11, delayer_i12, delayer_i13, delayer_i14, delayer_i15, delayer_i16, delayer_i17, delayer_i18, delayer_i19, delayer_i20, delayer_i21, delayer_i22, delayer_i23
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