arbiter.cc revision 10234 
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32
33#include "arbiter.h"
34
35Arbiter::Arbiter(
36    double n_req,
37    double flit_size_,
38    double output_len,
39    TechnologyParameter::DeviceType *dt
40    ): R(n_req), flit_size(flit_size_),
41       o_len (output_len), deviceType(dt) {
42    min_w_pmos = deviceType->n_to_p_eff_curr_drv_ratio * g_tp.min_w_nmos_;
43    Vdd = dt->Vdd;
44    double technology = g_ip->F_sz_um;
45    NTn1 = 13.5 * technology / 2;
46    PTn1 = 76 * technology / 2;
47    NTn2 = 13.5 * technology / 2;
48    PTn2 = 76 * technology / 2;
49    NTi = 12.5 * technology / 2;
50    PTi = 25 * technology / 2;
51    NTtr = 10 * technology / 2; /*Transmission gate's nmos tr. length*/
52    PTtr = 20 * technology / 2; /* pmos tr. length*/
53}
54
55Arbiter::~Arbiter() {}
56
57double
58Arbiter::arb_req() {
59    double temp = ((R - 1) * (2 * gate_C(NTn1, 0) + gate_C(PTn1, 0)) + 2 *
60                   gate_C(NTn2, 0) +
61                   gate_C(PTn2, 0) + gate_C(NTi, 0) + gate_C(PTi, 0) +
62                   drain_C_(NTi, 0, 1, 1, g_tp.cell_h_def) +
63                   drain_C_(PTi, 1, 1, 1, g_tp.cell_h_def));
64    return temp;
65}
66
67double
68Arbiter::arb_pri() {
69    /* switching capacitance of flip-flop is ignored */
70    double temp = 2 * (2 * gate_C(NTn1, 0) + gate_C(PTn1, 0));
71    return temp;
72}
73
74
75double
76Arbiter::arb_grant() {
77    double temp = drain_C_(NTn1, 0, 1, 1, g_tp.cell_h_def) * 2 +
78        drain_C_(PTn1, 1, 1, 1, g_tp.cell_h_def) + crossbar_ctrline();
79    return temp;
80}
81
82double
83Arbiter::arb_int() {
84    double temp = (drain_C_(NTn1, 0, 1, 1, g_tp.cell_h_def) * 2 +
85                   drain_C_(PTn1, 1, 1, 1, g_tp.cell_h_def) +
86                   2 * gate_C(NTn2, 0) + gate_C(PTn2, 0));
87    return temp;
88}
89
90void
91Arbiter::compute_power() {
92    power.readOp.dynamic = (R * arb_req() * Vdd * Vdd / 2 + R * arb_pri() *
93                            Vdd * Vdd / 2 +
94                            arb_grant() * Vdd * Vdd + arb_int() * 0.5 * Vdd *
95                            Vdd);
96    double nor1_leak = cmos_Isub_leakage(g_tp.min_w_nmos_ * NTn1 * 2,
97                                         min_w_pmos * PTn1 * 2, 2, nor);
98    double nor2_leak = cmos_Isub_leakage(g_tp.min_w_nmos_ * NTn2 * R,
99                                         min_w_pmos * PTn2 * R, 2, nor);
100    double not_leak = cmos_Isub_leakage(g_tp.min_w_nmos_ * NTi,
101                                        min_w_pmos * PTi, 1, inv);
102    double nor1_leak_gate = cmos_Ig_leakage(g_tp.min_w_nmos_ * NTn1 * 2,
103                                            min_w_pmos * PTn1 * 2, 2, nor);
104    double nor2_leak_gate = cmos_Ig_leakage(g_tp.min_w_nmos_ * NTn2 * R,
105                                            min_w_pmos * PTn2 * R, 2, nor);
106    double not_leak_gate  = cmos_Ig_leakage(g_tp.min_w_nmos_ * NTi,
107                                            min_w_pmos * PTi, 1, inv);
108    //FIXME include priority table leakage
109    power.readOp.leakage = (nor1_leak + nor2_leak + not_leak) * Vdd;
110    power.readOp.gate_leakage = nor1_leak_gate * Vdd + nor2_leak_gate * Vdd +
111        not_leak_gate * Vdd;
112}
113
114double //wire cap with triple spacing
115Arbiter::Cw3(double length) {
116    Wire wc(g_ip->wt, length, 1, 3, 3);
117    double temp = (wc.wire_cap(length, true));
118    return temp;
119}
120
121double
122Arbiter::crossbar_ctrline() {
123    double temp = (Cw3(o_len * 1e-6 /* m */) +
124                   drain_C_(NTi, 0, 1, 1, g_tp.cell_h_def) + drain_C_(PTi, 1, 1, 1, g_tp.cell_h_def) +
125                   gate_C(NTi, 0) + gate_C(PTi, 0));
126    return temp;
127}
128
129double
130Arbiter::transmission_buf_ctrcap() {
131    double temp = gate_C(NTtr, 0) + gate_C(PTtr, 0);
132    return temp;
133}
134
135
136void Arbiter::print_arbiter() {
137    cout << "\nArbiter Stats ("   << R << " input arbiter" << ")\n\n";
138    cout << "Flit size        : " << flit_size << " bits" << endl;
139    cout << "Dynamic Power    : " << power.readOp.dynamic*1e9 << " (nJ)" << endl;
140    cout << "Leakage Power    : " << power.readOp.leakage*1e3 << " (mW)" << endl;
141}
142
143
144