📄 limiter.py
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########################################################################## ######## limiter.p ######## ######## 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 myhdl import Signal, always_combdef limiter(a, b, y1, y2, y1Int, y2Int, aLim, bLim, y1Lim, y2Lim, y1IntLim, y2IntLim, n = 4): """ Limiter [-2**(n - 1) + 1, 2**(n - 1) - 1]. n -- number of bits for the coding of the decoder input signals a, b, y1, y2, y1Int, y2Int -- in : decoder input signals, coded with n bits aLim, bLim, y1Lim, y2Lim, y1IntLim, y2IntLim -- out : limited signals """ def limitLogic(): if a.val <= -2**(n - 1): aLim.next = -2**(n - 1) + 1 elif a.val >= 2**(n - 1): aLim.next = 2**(n - 1) - 1 else: aLim.next = a.val if b.val <= -2**(n - 1): bLim.next = -2**(n - 1) + 1 elif b.val >= 2**(n - 1): bLim.next = 2**(n - 1) - 1 else: bLim.next = b.val if y1.val <= -2**(n - 1): y1Lim.next = -2**(n - 1) + 1 elif y1.val >= 2**(n - 1): y1Lim.next = 2**(n - 1) - 1 else: y1Lim.next = y1.val if y2.val <= -2**(n - 1): y2Lim.next = -2**(n - 1) + 1 elif y2.val >= 2**(n - 1): y2Lim.next = 2**(n - 1) - 1 else: y2Lim.next = y2.val if y1Int.val <= -2**(n - 1): y1IntLim.next = -2**(n - 1) + 1 elif y1Int.val >= 2**(n - 1): y1IntLim.next = 2**(n - 1) - 1 else: y1IntLim.next = y1Int.val if y2Int.val <= -2**(n - 1): y2IntLim.next = -2**(n - 1) + 1 elif y2Int.val >= 2**(n - 1): y2IntLim.next = 2**(n - 1) - 1 else: y2IntLim.next = y2Int.val return always_comb(limitLogic)⌨️ 快捷键说明
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