xref: /gem5/ext/mcpat/cacti/arbiter.cc

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#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 = cmos_Isub_leakage(g_tp.min_w_nmos_*NTn1*2, min_w_pmos * PTn1*2, 2, nor);
  double nor2_leak = cmos_Isub_leakage(g_tp.min_w_nmos_*NTn2*R, min_w_pmos * PTn2*R, 2, nor);
  double not_leak = cmos_Isub_leakage(g_tp.min_w_nmos_*NTi, min_w_pmos * PTi, 1, inv);
  double nor1_leak_gate = cmos_Ig_leakage(g_tp.min_w_nmos_*NTn1*2, min_w_pmos * PTn1*2, 2, nor);
  double nor2_leak_gate = cmos_Ig_leakage(g_tp.min_w_nmos_*NTn2*R, min_w_pmos * PTn2*R, 2, nor);
  double not_leak_gate  = cmos_Ig_leakage(g_tp.min_w_nmos_*NTi, min_w_pmos * PTi, 1, inv);
  power.readOp.leakage = (nor1_leak + nor2_leak + not_leak)*Vdd; //FIXME include priority table leakage
  power.readOp.gate_leakage = nor1_leak_gate*Vdd + nor2_leak_gate*Vdd + not_leak_gate*Vdd;
}

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,true));
  return temp;
}

double
Arbiter::crossbar_ctrline() {
  double temp = (Cw3(o_len * 1e-6 /* m */) +
      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;
}