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arbiter.cc
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/*------------------------------------------------------------
* CACTI 6.5
* Copyright 2008 Hewlett-Packard Development Corporation
* All Rights Reserved
*
* Permission to use, copy, and modify this software and its documentation is
* hereby granted only under the following terms and conditions. Both the
* above copyright notice and this permission notice must appear in all copies
* of the software, derivative works or modified versions, and any portions
* thereof, and both notices must appear in supporting documentation.
*
* Users of this software agree to the terms and conditions set forth herein, and
* hereby grant back to Hewlett-Packard Company and its affiliated companies ("HP")
* a non-exclusive, unrestricted, royalty-free right and license under any changes,
* enhancements or extensions made to the core functions of the software, including
* but not limited to those affording compatibility with other hardware or software
* environments, but excluding applications which incorporate this software.
* Users further agree to use their best efforts to return to HP any such changes,
* enhancements or extensions that they make and inform HP of noteworthy uses of
* this software. Correspondence should be provided to HP at:
*
* Director of Intellectual Property Licensing
* Office of Strategy and Technology
* Hewlett-Packard Company
* 1501 Page Mill Road
* Palo Alto, California 94304
*
* This software may be distributed (but not offered for sale or transferred
* for compensation) to third parties, provided such third parties agree to
* abide by the terms and conditions of this notice.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND HP DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL HP
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*------------------------------------------------------------*/
#include "arbiter.h"
Arbiter::Arbiter(
double n_req,
double flit_size_,
double output_len,
TechnologyParameter::DeviceType *dt
):R(n_req), flit_size(flit_size_),
o_len (output_len), deviceType(dt)
{
min_w_pmos = deviceType->n_to_p_eff_curr_drv_ratio*g_tp.min_w_nmos_;
Vdd = dt->Vdd;
double technology = g_ip->F_sz_um;
NTn1 = 13.5*technology/2;
PTn1 = 76*technology/2;
NTn2 = 13.5*technology/2;
PTn2 = 76*technology/2;
NTi = 12.5*technology/2;
PTi = 25*technology/2;
NTtr = 10*technology/2; /*Transmission gate's nmos tr. length*/
PTtr = 20*technology/2; /* pmos tr. length*/
}
Arbiter::~Arbiter(){}
double
Arbiter::arb_req() {
double temp = ((R-1)*(2*gate_C(NTn1, 0)+gate_C(PTn1, 0)) + 2*gate_C(NTn2, 0) +
gate_C(PTn2, 0) + gate_C(NTi, 0) + gate_C(PTi, 0) +
drain_C_(NTi, 0, 1, 1, g_tp.cell_h_def) + drain_C_(PTi, 1, 1, 1, g_tp.cell_h_def));
return temp;
}
double
Arbiter::arb_pri() {
double temp = 2*(2*gate_C(NTn1, 0)+gate_C(PTn1, 0)); /* switching capacitance
of flip-flop is ignored */
return temp;
}
double
Arbiter::arb_grant() {
double temp = drain_C_(NTn1, 0, 1, 1, g_tp.cell_h_def)*2 + drain_C_(PTn1, 1, 1, 1, g_tp.cell_h_def) + crossbar_ctrline();
return temp;
}
double
Arbiter::arb_int() {
double temp = (drain_C_(NTn1, 0, 1, 1, g_tp.cell_h_def)*2 + drain_C_(PTn1, 1, 1, 1, g_tp.cell_h_def) +
2*gate_C(NTn2, 0) + gate_C(PTn2, 0));
return temp;
}
void
Arbiter::compute_power() {
power.readOp.dynamic = (R*arb_req()*Vdd*Vdd/2 + R*arb_pri()*Vdd*Vdd/2 +
arb_grant()*Vdd*Vdd + arb_int()*0.5*Vdd*Vdd);
double nor1_leak = deviceType->Vdd*cmos_Ileak(g_tp.min_w_nmos_*NTn1*2, min_w_pmos * PTn1*2, false);
double nor2_leak = deviceType->Vdd*cmos_Ileak(g_tp.min_w_nmos_*NTn2*R, min_w_pmos * PTn2*R, false);
double not_leak = deviceType->Vdd*cmos_Ileak(g_tp.min_w_nmos_*NTi, min_w_pmos * PTi, false);
power.readOp.leakage = nor1_leak + nor2_leak + not_leak; //FIXME include priority table leakage
}
double //wire cap with triple spacing
Arbiter::Cw3(double length) {
Wire wc(g_ip->wt, length, 1, 3, 3);
double temp = (wc.wire_cap(length));
return temp;
}
double
Arbiter::crossbar_ctrline() {
double temp = (Cw3(o_len * 1e-6 /* m */) + flit_size*transmission_buf_ctrcap() +
drain_C_(NTi, 0, 1, 1, g_tp.cell_h_def) + drain_C_(PTi, 1, 1, 1, g_tp.cell_h_def) +
gate_C(NTi, 0) + gate_C(PTi, 0));
return temp;
}
double
Arbiter::transmission_buf_ctrcap() {
double temp = gate_C(NTtr, 0)+gate_C(PTtr, 0);
return temp;
}
void Arbiter::print_arbiter()
{
cout << "\nArbiter Stats (" << R << " input arbiter" << ")\n\n";
cout << "Flit size : " << flit_size << " bits" << endl;
cout << "Dynamic Power : " << power.readOp.dynamic*1e9 << " (nJ)" << endl;
cout << "Leakage Power : " << power.readOp.leakage*1e3 << " (mW)" << endl;
}