📄 acs.py
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########################################################################## ######## acs.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 select import accDistSel, stateSelfrom misc import opposite, delayer, mux8, mux4, subfrom distances import distances, accDistfrom myhdl import Signal, instances, intbvdef acs(clk, rst, a, b, y1, y2, z, selStateL, selDistL, selState, stateDist, weight, q = 8, l = 20, n = 4, r = 5): """ Add-Compare-Select top level. q -- accumulated distance width l -- first trellis length n -- received decoder signal width r -- extrinsic information width clk, rst -- in : clock and negative reset a, b, y1, y2 -- in : received decoder signals z -- in : extrinsic information selStateL -- in : selected state at t = L selDistL -- in : selected transition at selStateL selState -- out : selected state stateDist -- out : selected accumulated distances (per state) weight -- out : four weights sorted by transition code """ 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] distance16 = [Signal(intbv(0, 0, 4*(2**(n-1))+(2**r))) for i in range(16)] accDist8 = [Signal(intbv(0, 0, 2**q)) for i in range(8)] accDist32 = [Signal(intbv(0, 0, 2**q)) for i in range(32)] accDistDel32 = [[Signal(intbv(0, 0, 2**q)) for i in range(4)] for j in range(8)] accDistDel4 = [Signal(intbv(0, 0, 2**q)) for i in range(4)] selAccDistL = Signal(intbv(0, 0, 2**q)) delayer_i = [None for i in range(32)] distances_i0 = distances(a, b, y1, y2, z, distance16) accDist_i0 = accDist(clk, rst, accDist8, distance16, accDist32, q) for i in range(8): for j in range(4): delayer_i[i * 4 + j] = delayer(clk, rst, accDist32[from2to[i * 4 + j]], accDistDel32[i][j], l - 1, 0, 2**(q+1)) mux8_i0 = mux8(accDistDel32[0], accDistDel32[1], accDistDel32[2], accDistDel32[3], accDistDel32[4], accDistDel32[5], accDistDel32[6], accDistDel32[7], selStateL, accDistDel4) mux4_i0 = mux4(accDistDel4[0], accDistDel4[1], accDistDel4[2], accDistDel4[3], selDistL, selAccDistL) sub_i0 = sub(accDistDel4[0], selAccDistL, weight[0]) sub_i1 = sub(accDistDel4[1], selAccDistL, weight[1]) sub_i2 = sub(accDistDel4[2], selAccDistL, weight[2]) sub_i3 = sub(accDistDel4[3], selAccDistL, weight[3]) accDistSel_i0 = accDistSel(accDist32, stateDist, accDist8, q) stateSel_i0 = stateSel(accDist8, selState, q) return instances()⌨️ 快捷键说明
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