📄 select.py
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########################################################################## ######## select.py ######## ######## This file is part of the turbo decoder IP core project ######## http://www.opencores.org/projects/turbocodes/ ######## ######## Author(s): ######## - David Brochart(dbrochart@opencores.org) ######## ######## All additional information is available in the README.txt ######## file. ######## ############################################################################## ######## Copyright (C) 2005 Authors ######## ######## This source file may be used and distributed without ######## restriction provided that this copyright statement is not ######## removed from the file and that any derivative work contains ######## the original copyright notice and the associated disclaimer. ######## ######## This source file is free software; you can redistribute it ######## and/or modify it under the terms of the GNU Lesser General ######## Public License as published by the Free Software Foundation; ######## either version 2.1 of the License, or (at your option) any ######## later version. ######## ######## This source 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 Lesser General Public License for more ######## details. ######## ######## You should have received a copy of the GNU Lesser General ######## Public License along with this source; if not, download it ######## from http://www.opencores.org/lgpl.shtml ######## ##########################################################################from misc import min4, cod2, mux4, min8, cod3from myhdl import Signal, instancesdef accDistSel(accDist, accDistCod, accDistOut, q = 8): """ Accumulated distance selection (one out of four, per state) accDist -- in : array of 32 (q+1)-bit accumulated distances accDistCod -- out : array of 8 2-bit selection signals accDistOut -- out : array of 8 (q+1)-bit selected accumulated distances """ min4_i = [None for i in range(8)] cod2_i = [None for i in range(8)] mux4_i = [None for i in range(8)] comp = [Signal(bool(0)) for i in range(24)] from2to = [0, 25, 6, 31, 8, 17, 14, 23, 20, 13, 18, 11, 28, 5, 26, 3, 4, 29, 2, 27, 12, 21, 10, 19, 16, 9, 22, 15, 24, 1, 30, 7] for i in range(8): min4_i[i] = min4(accDist[from2to[4*i]], accDist[from2to[4*i+1]], accDist[from2to[4*i+2]], accDist[from2to[4*i+3]], comp[3*i], comp[3*i+1], comp[3*i+2], q) for i in range(8): cod2_i[i] = cod2(comp[3*i], comp[3*i+1], comp[3*i+2], accDistCod[i]) for i in range(8): mux4_i[i] = mux4(accDist[from2to[4*i]], accDist[from2to[4*i+1]], accDist[from2to[4*i+2]], accDist[from2to[4*i+3]], accDistCod[i], accDistOut[i]) return instances()def stateSel(stateDist, selState, q = 8): """ State selection (one out of eight). q -- accumulated distance width stateDist -- in : state accumulated distance selState -- out : selected state code """ tmp = [Signal(bool(0)) for i in range(7)] min8_i0 = min8(stateDist, tmp, q) cod3_i0 = cod3(tmp, selState) return instances()⌨️ 快捷键说明
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