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author | David Shah <dave@ds0.me> | 2020-11-09 16:06:40 +0000 |
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committer | David Shah <dave@ds0.me> | 2020-11-30 08:45:28 +0000 |
commit | fa9194e3e2212ef265b94b1be58da7c59d9a0bbf (patch) | |
tree | bd4c0827720012d8a14b3f7ef9f3aca92763a315 /nexus/arch.cc | |
parent | 963fd175ad69c5468bfc486e789cf6c7ff85f57e (diff) | |
download | nextpnr-fa9194e3e2212ef265b94b1be58da7c59d9a0bbf.tar.gz nextpnr-fa9194e3e2212ef265b94b1be58da7c59d9a0bbf.tar.bz2 nextpnr-fa9194e3e2212ef265b94b1be58da7c59d9a0bbf.zip |
nexus: Add cell delay lookup
Signed-off-by: David Shah <dave@ds0.me>
Diffstat (limited to 'nexus/arch.cc')
-rw-r--r-- | nexus/arch.cc | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/nexus/arch.cc b/nexus/arch.cc index aff00d5d..a25fc95e 100644 --- a/nexus/arch.cc +++ b/nexus/arch.cc @@ -435,11 +435,27 @@ DecalXY Arch::getGroupDecal(GroupId pip) const { return {}; }; bool Arch::getCellDelay(const CellInfo *cell, IdString fromPort, IdString toPort, DelayInfo &delay) const { + if (cell->type == id_OXIDE_COMB) { + if (toPort == id_F) + return lookup_cell_delay(cell->tmg_index, fromPort, toPort, delay); + } return false; } TimingPortClass Arch::getPortTimingClass(const CellInfo *cell, IdString port, int &clockInfoCount) const { + auto disconnected = [cell](IdString p) { return !cell->ports.count(p) || cell->ports.at(p).net == nullptr; }; + if (cell->type == id_OXIDE_COMB) { + if (port == id_A || port == id_B || port == id_C || port == id_D) + return TMG_COMB_INPUT; + if (port == id_F) { + if (disconnected(id_A) && disconnected(id_B) && disconnected(id_C) && disconnected(id_D) && + disconnected(id_FCI)) + return TMG_IGNORE; + else + return TMG_COMB_OUTPUT; + } + } return TMG_IGNORE; } @@ -673,6 +689,71 @@ std::string Arch::get_pad_functions(const PadInfoPOD *pad) const // ----------------------------------------------------------------------- +// Helper for cell timing lookups +namespace { +template <typename Tres, typename Tgetter, typename Tkey> +int db_binary_search(const Tres *list, int count, Tgetter key_getter, Tkey key) +{ + if (count < 7) { + for (int i = 0; i < count; i++) { + if (key_getter(list[i]) == key) { + return i; + } + } + } else { + int b = 0, e = count - 1; + while (b <= e) { + int i = (b + e) / 2; + if (key_getter(list[i]) == key) { + return i; + } + if (key_getter(list[i]) > key) + e = i - 1; + else + b = i + 1; + } + } + return -1; +} +} // namespace + +int Arch::get_cell_timing_idx(IdString cell_type, IdString cell_variant) const +{ + return db_binary_search( + speed_grade->cell_types.get(), speed_grade->num_cell_types, + [](const CellTimingPOD &ct) { return std::make_pair(ct.cell_type, ct.cell_variant); }, + std::make_pair(cell_type.index, cell_variant.index)); +} + +bool Arch::lookup_cell_delay(int type_idx, IdString from_port, IdString to_port, DelayInfo &delay) const +{ + NPNR_ASSERT(type_idx != -1); + const auto &ct = speed_grade->cell_types[type_idx]; + int dly_idx = db_binary_search( + ct.prop_delays.get(), ct.num_prop_delays, + [](const CellPropDelayPOD &pd) { return std::make_pair(pd.from_port, pd.to_port); }, + std::make_pair(from_port.index, to_port.index)); + if (dly_idx == -1) + return false; + delay.min_delay = ct.prop_delays[dly_idx].min_delay; + delay.max_delay = ct.prop_delays[dly_idx].max_delay; + return true; +} + +void Arch::lookup_cell_setuphold(int type_idx, IdString from_port, IdString clock, DelayInfo &setup, + DelayInfo &hold) const +{ + NPNR_ASSERT(type_idx != -1); + const auto &ct = speed_grade->cell_types[type_idx]; + int dly_idx = db_binary_search( + ct.setup_holds.get(), ct.num_setup_holds, + [](const CellSetupHoldPOD &sh) { return std::make_pair(sh.sig_port, sh.clock_port); }, + std::make_pair(from_port.index, clock.index)); + NPNR_ASSERT(dly_idx != -1); +} + +// ----------------------------------------------------------------------- + #ifdef WITH_HEAP const std::string Arch::defaultPlacer = "heap"; #else |