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authorVijayKandiah <[email protected]>2021-10-17 02:18:10 -0500
committerVijayKandiah <[email protected]>2021-10-17 02:18:10 -0500
commit84c6cf45131e42b1a724ebf7977987a9ddb70db9 (patch)
treee82f15238e79a03f3cc2435d4f9bb48d5023e8ae /src/gpuwattch/cacti/crossbar.cc
parent4a4fc87a2dcd95bfe298f2b3d18a9833a506e499 (diff)
AccelWattch dev Integration
Diffstat (limited to 'src/gpuwattch/cacti/crossbar.cc')
-rw-r--r--src/gpuwattch/cacti/crossbar.cc161
1 files changed, 0 insertions, 161 deletions
diff --git a/src/gpuwattch/cacti/crossbar.cc b/src/gpuwattch/cacti/crossbar.cc
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--- a/src/gpuwattch/cacti/crossbar.cc
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-/*****************************************************************************
- * McPAT/CACTI
- * SOFTWARE LICENSE AGREEMENT
- * Copyright 2012 Hewlett-Packard Development Company, L.P.
- * All Rights Reserved
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met: redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer;
- * redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution;
- * neither the name of the copyright holders nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
-
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.”
- *
- ***************************************************************************/
-
-#include "crossbar.h"
-
-#define ASPECT_THRESHOLD .8
-#define ADJ 1
-
-Crossbar::Crossbar(
- double n_inp_,
- double n_out_,
- double flit_size_,
- TechnologyParameter::DeviceType *dt
- ):n_inp(n_inp_), n_out(n_out_), flit_size(flit_size_), deviceType(dt)
-{
- min_w_pmos = deviceType->n_to_p_eff_curr_drv_ratio*g_tp.min_w_nmos_;
- Vdd = dt->Vdd;
- CB_ADJ = 1;
-}
-
-Crossbar::~Crossbar(){}
-
-double Crossbar::output_buffer()
-{
-
- //Wire winit(4, 4);
- double l_eff = n_inp*flit_size*g_tp.wire_outside_mat.pitch;
- Wire w1(g_ip->wt, l_eff);
- //double s1 = w1.repeater_size *l_eff*ADJ/w1.repeater_spacing;
- double s1 = w1.repeater_size * (l_eff <w1.repeater_spacing? l_eff *ADJ/w1.repeater_spacing : ADJ);
- double pton_size = deviceType->n_to_p_eff_curr_drv_ratio;
- // the model assumes input capacitance of the wire driver = input capacitance of nand + nor = input cap of the driver transistor
- TriS1 = s1*(1 + pton_size)/(2 + pton_size + 1 + 2*pton_size);
- TriS2 = s1; //driver transistor
-
- if (TriS1 < 1)
- TriS1 = 1;
-
- double input_cap = gate_C(TriS1*(2*min_w_pmos + g_tp.min_w_nmos_), 0) +
- gate_C(TriS1*(min_w_pmos + 2*g_tp.min_w_nmos_), 0);
-// input_cap += drain_C_(TriS1*g_tp.min_w_nmos_, NCH, 1, 1, g_tp.cell_h_def) +
-// drain_C_(TriS1*min_w_pmos, PCH, 1, 1, g_tp.cell_h_def)*2 +
-// gate_C(TriS2*g_tp.min_w_nmos_, 0)+
-// drain_C_(TriS1*min_w_pmos, NCH, 1, 1, g_tp.cell_h_def)*2 +
-// drain_C_(TriS1*min_w_pmos, PCH, 1, 1, g_tp.cell_h_def) +
-// gate_C(TriS2*min_w_pmos, 0);
- tri_int_cap = drain_C_(TriS1*g_tp.min_w_nmos_, NCH, 1, 1, g_tp.cell_h_def) +
- drain_C_(TriS1*min_w_pmos, PCH, 1, 1, g_tp.cell_h_def)*2 +
- gate_C(TriS2*g_tp.min_w_nmos_, 0)+
- drain_C_(TriS1*min_w_pmos, NCH, 1, 1, g_tp.cell_h_def)*2 +
- drain_C_(TriS1*min_w_pmos, PCH, 1, 1, g_tp.cell_h_def) +
- gate_C(TriS2*min_w_pmos, 0);
- double output_cap = drain_C_(TriS2*g_tp.min_w_nmos_, NCH, 1, 1, g_tp.cell_h_def) +
- drain_C_(TriS2*min_w_pmos, PCH, 1, 1, g_tp.cell_h_def);
- double ctr_cap = gate_C(TriS2 *(min_w_pmos + g_tp.min_w_nmos_), 0);
-
- tri_inp_cap = input_cap;
- tri_out_cap = output_cap;
- tri_ctr_cap = ctr_cap;
- return input_cap + output_cap + ctr_cap;
-}
-
-void Crossbar::compute_power()
-{
-
- Wire winit(4, 4);
- double tri_cap = output_buffer();
- assert(tri_cap > 0);
- //area of a tristate logic
- double g_area = compute_gate_area(INV, 1, TriS2*g_tp.min_w_nmos_, TriS2*min_w_pmos, g_tp.cell_h_def);
- g_area *= 2; // to model area of output transistors
- g_area += compute_gate_area (NAND, 2, TriS1*2*g_tp.min_w_nmos_, TriS1*min_w_pmos, g_tp.cell_h_def);
- g_area += compute_gate_area (NOR, 2, TriS1*g_tp.min_w_nmos_, TriS1*2*min_w_pmos, g_tp.cell_h_def);
- double width /*per tristate*/ = g_area/(CB_ADJ * g_tp.cell_h_def);
- // effective no. of tristate buffers that need to be laid side by side
- int ntri = (int)ceil(g_tp.cell_h_def/(g_tp.wire_outside_mat.pitch));
- double wire_len = MAX(width*ntri*n_out, flit_size*g_tp.wire_outside_mat.pitch*n_out);
- Wire w1(g_ip->wt, wire_len);
-
- area.w = wire_len;
- area.h = g_tp.wire_outside_mat.pitch*n_inp*flit_size * CB_ADJ;
- Wire w2(g_ip->wt, area.h);
-
- double aspect_ratio_cb = (area.h/area.w)*(n_out/n_inp);
- if (aspect_ratio_cb > 1) aspect_ratio_cb = 1/aspect_ratio_cb;
-
- if (aspect_ratio_cb < ASPECT_THRESHOLD) {
- if (n_out > 2 && n_inp > 2) {
- CB_ADJ+=0.2;
- //cout << "CB ADJ " << CB_ADJ << endl;
- if (CB_ADJ < 4) {
- this->compute_power();
- }
- }
- }
-
-
-
- power.readOp.dynamic = (w1.power.readOp.dynamic + w2.power.readOp.dynamic + (tri_inp_cap * n_out + tri_out_cap * n_inp + tri_ctr_cap + tri_int_cap) * Vdd*Vdd)*flit_size;
- power.readOp.leakage = n_inp * n_out * flit_size * (
- cmos_Isub_leakage(g_tp.min_w_nmos_*TriS2*2, min_w_pmos*TriS2*2, 1, inv) *Vdd+
- cmos_Isub_leakage(g_tp.min_w_nmos_*TriS1*3, min_w_pmos*TriS1*3, 2, nand)*Vdd+
- cmos_Isub_leakage(g_tp.min_w_nmos_*TriS1*3, min_w_pmos*TriS1*3, 2, nor) *Vdd+
- w1.power.readOp.leakage + w2.power.readOp.leakage);
- power.readOp.gate_leakage = n_inp * n_out * flit_size * (
- cmos_Ig_leakage(g_tp.min_w_nmos_*TriS2*2, min_w_pmos*TriS2*2, 1, inv) *Vdd+
- cmos_Ig_leakage(g_tp.min_w_nmos_*TriS1*3, min_w_pmos*TriS1*3, 2, nand)*Vdd+
- cmos_Ig_leakage(g_tp.min_w_nmos_*TriS1*3, min_w_pmos*TriS1*3, 2, nor) *Vdd+
- w1.power.readOp.gate_leakage + w2.power.readOp.gate_leakage);
-
- // delay calculation
- double l_eff = n_inp*flit_size*g_tp.wire_outside_mat.pitch;
- Wire wdriver(g_ip->wt, l_eff);
- double res = g_tp.wire_outside_mat.R_per_um * (area.w+area.h) + tr_R_on(g_tp.min_w_nmos_*wdriver.repeater_size, NCH, 1);
- double cap = g_tp.wire_outside_mat.C_per_um * (area.w + area.h) + n_out*tri_inp_cap + n_inp*tri_out_cap;
- delay = horowitz(w1.signal_rise_time(), res*cap, deviceType->Vth/deviceType->Vdd, deviceType->Vth/deviceType->Vdd, RISE);
-
- Wire wreset();
-}
-
-void Crossbar::print_crossbar()
-{
- cout << "\nCrossbar Stats (" << n_inp << "x" << n_out << ")\n\n";
- cout << "Flit size : " << flit_size << " bits" << endl;
- cout << "Width : " << area.w << " u" << endl;
- cout << "Height : " << area.h << " u" << endl;
- cout << "Dynamic Power : " << power.readOp.dynamic*1e9 * MIN(n_inp, n_out) << " (nJ)" << endl;
- cout << "Leakage Power : " << power.readOp.leakage*1e3 << " (mW)" << endl;
- cout << "Gate Leakage Power : " << power.readOp.gate_leakage*1e3 << " (mW)" << endl;
- cout << "Crossbar Delay : " << delay*1e12 << " ps\n";
-}
-
-