98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
/*
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* Copyright (c) 2001-2010 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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# include "bufif.h"
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# include "functor.h"
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# include "schedule.h"
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# include "statistics.h"
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vvp_bufif_s::vvp_bufif_s(bool en_invert, bool out_invert,
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unsigned str0, unsigned str1)
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: pol_(en_invert? 1 : 0), inv_(out_invert? 1 : 0)
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{
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odrive0 = str0;
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odrive1 = str1;
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count_functors_bufif += 1;
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}
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void vvp_bufif_s::set(vvp_ipoint_t ptr, bool push, unsigned v, unsigned)
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{
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put(ptr, v);
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unsigned in0 = ival & 0x03;
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unsigned in1 = (ival >> 2) & 0x03;
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unsigned char out0 = 0x00 | (odrive0<<0) | (odrive0<<4);
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unsigned char out1 = 0x88 | (odrive1<<0) | (odrive1<<4);
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unsigned char outX = 0x80 | (odrive0<<0) | (odrive1<<4);
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unsigned char outH = 0x80 | (0) | (odrive1<<4);
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unsigned char outL = 0x80 | (odrive0<<0) | (0);
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unsigned val;
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unsigned str;
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switch (in1 ^ pol_) {
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case 1:
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switch (in0 ^ inv_) {
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case 0:
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val = 0;
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str = out0;
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break;
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case 1:
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val = 1;
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str = out1;
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break;
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default:
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val = 2;
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str = outX;
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break;
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}
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break;
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case 0:
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val = 3;
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str = HiZ;
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break;
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/* The control input is x or z, so the output is H or
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L, depending on the (possibly inverted) input. This
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is not the same as X, as it is a combination of the
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drive strength of the output and HiZ. */
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default:
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switch (in0 ^ inv_) {
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case 0:
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val = 2;
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str = outL;
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break;
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case 1:
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val = 2;
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str = outH;
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break;
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default:
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val = 2;
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str = outX;
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break;
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}
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break;
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}
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put_ostr(val, str, push);
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}
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