172 lines
6.2 KiB
C++
172 lines
6.2 KiB
C++
/*
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* Copyright (c) 2009 Princeton University
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* Copyright (c) 2009 The Regents of the University of California
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Hangsheng Wang (Orion 1.0, Princeton)
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* Xinping Zhu (Orion 1.0, Princeton)
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* Xuning Chen (Orion 1.0, Princeton)
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* Bin Li (Orion 2.0, Princeton)
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* Kambiz Samadi (Orion 2.0, UC San Diego)
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*/
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#include <cmath>
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#include "mem/ruby/network/orion/Buffer/DecoderUnit.hh"
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#include "mem/ruby/network/orion/TechParameter.hh"
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using namespace std;
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DecoderUnit::DecoderUnit(
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const string& dec_model_str_,
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uint32_t dec_width_,
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const TechParameter* tech_param_ptr_
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)
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{
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if (dec_model_str_.compare("GENERIC_DEC") == 0)
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{
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m_dec_model = GENERIC_DEC;
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}
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else
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{
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m_dec_model = NO_MODEL;
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}
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if (m_dec_model != NO_MODEL)
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{
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m_dec_width = dec_width_;
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m_tech_param_ptr = tech_param_ptr_;
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init();
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}
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}
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DecoderUnit::~DecoderUnit()
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{
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}
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void DecoderUnit::init()
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{
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if (m_dec_width >= 4)
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{ // 2-level decoder
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m_num_in_1st = (m_dec_width == 4)? 2:3;
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m_num_out_0th = 1 << (m_num_in_1st - 1);
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m_num_in_2nd = (uint32_t)ceil((double)m_dec_width/(double)m_num_in_1st);
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m_num_out_1st = 1 << (m_dec_width - m_num_in_1st);
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}
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else if (m_dec_width >= 2)
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{ // 1-level decoder
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m_num_in_1st = m_dec_width;
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m_num_out_0th = 1 << (m_num_in_1st - 1);
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m_num_in_2nd = m_num_out_1st = 0;
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}
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else
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{
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m_num_in_1st = m_num_out_0th = m_num_in_2nd = m_num_out_1st = 0;
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}
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// compute energy constants
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double e_factor = m_tech_param_ptr->get_vdd() * m_tech_param_ptr->get_vdd();
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if (m_dec_width >= 4)
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{
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m_e_chg_l1 = calc_chgl1_cap() * e_factor;
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m_e_chg_output = calc_select_cap() * e_factor;
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}
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else if (m_dec_width >= 2)
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{
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m_e_chg_l1 = calc_chgl1_cap() * e_factor;
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m_e_chg_output = 0;
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}
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else
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{
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m_e_chg_l1 = m_e_chg_output = 0;
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}
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m_e_chg_addr = calc_chgaddr_cap() * e_factor;
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return;
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}
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double DecoderUnit::calc_chgl1_cap()
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{
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double total_cap;
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// part 1: drain cap of level-1 decoder
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double Wdec3to8p = m_tech_param_ptr->get_Wdec3to8p();
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double Wdec3to8n = m_tech_param_ptr->get_Wdec3to8n();
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total_cap = m_num_in_1st * m_tech_param_ptr->calc_draincap(Wdec3to8p, TechParameter::PCH, 1) + m_tech_param_ptr->calc_draincap(Wdec3to8n, TechParameter::NCH, m_num_in_1st);
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/* part 2: gate cap of level-2 decoder */
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/* WHS: 40 and 20 should go to PARM */
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double WdecNORn = m_tech_param_ptr->get_WdecNORn();
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double WdecNORp = m_tech_param_ptr->get_WdecNORp();
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total_cap += m_num_out_0th*m_tech_param_ptr->calc_gatecap((WdecNORn+WdecNORp), m_num_in_2nd*40 + 20);
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return total_cap;
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}
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double DecoderUnit::calc_select_cap()
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{
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double total_cap;
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// part 1: drain cap of last level decoders
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double WdecNORp = m_tech_param_ptr->get_WdecNORp();
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double WdecNORn = m_tech_param_ptr->get_WdecNORn();
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total_cap = m_num_in_2nd * m_tech_param_ptr->calc_draincap(WdecNORn, TechParameter::NCH, 1) + m_tech_param_ptr->calc_draincap(WdecNORp, TechParameter::PCH, m_num_in_2nd);
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// part 2: output inverter
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// WHS: 20 should go to PARM
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double Wdecinvp = m_tech_param_ptr->get_Wdecinvp();
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double Wdecinvn = m_tech_param_ptr->get_Wdecinvn();
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total_cap += m_tech_param_ptr->calc_draincap(Wdecinvn, TechParameter::NCH, 1) + m_tech_param_ptr->calc_draincap(Wdecinvp, TechParameter::PCH, 1) + m_tech_param_ptr->calc_gatecap(Wdecinvn + Wdecinvp, 20);
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return total_cap;
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}
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double DecoderUnit::calc_chgaddr_cap()
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{
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double total_cap;
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// stage 1: input driver
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double Wdecdrivep = m_tech_param_ptr->get_Wdecdrivep();
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double Wdecdriven = m_tech_param_ptr->get_Wdecdriven();
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total_cap = m_tech_param_ptr->calc_draincap(Wdecdrivep, TechParameter::PCH, 1) + m_tech_param_ptr->calc_draincap(Wdecdriven, TechParameter::NCH, 1) + m_tech_param_ptr->calc_gatecap(Wdecdriven, 1);
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/* inverter to produce complement addr, this needs 1/2 */
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/* WHS: assume Wdecinv(np) for this inverter */
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double Wdecinvp = m_tech_param_ptr->get_Wdecinvp();
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double Wdecinvn = m_tech_param_ptr->get_Wdecinvn();
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total_cap += (m_tech_param_ptr->calc_draincap(Wdecinvp, TechParameter::PCH, 1) + m_tech_param_ptr->calc_draincap(Wdecinvn, TechParameter::NCH, 1) + m_tech_param_ptr->calc_gatecap(Wdecinvp, 1) + m_tech_param_ptr->calc_gatecap(Wdecinvn, 1)) / 2;
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/* stage 2: gate cap of level-1 decoder */
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/* WHS: 10 should go to PARM */
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double Wdec3to8p = m_tech_param_ptr->get_Wdec3to8p();
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double Wdec3to8n = m_tech_param_ptr->get_Wdec3to8n();
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total_cap += m_num_out_0th*m_tech_param_ptr->calc_gatecap( Wdec3to8n + Wdec3to8p, 10 );
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return total_cap;
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}
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