diff options
Diffstat (limited to 'mistral/lab.cc')
| -rw-r--r-- | mistral/lab.cc | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/mistral/lab.cc b/mistral/lab.cc index 7d798cbc..2d57ed42 100644 --- a/mistral/lab.cc +++ b/mistral/lab.cc @@ -42,20 +42,20 @@ static void create_alm(Arch *arch, int x, int y, int z, uint32_t lab_idx) WireId carry_in, share_in; WireId carry_out, share_out; if (z == 0 && i == 0) { - if (y == arch->getGridDimY() - 1) { - // Base case - carry_in = arch->add_wire(x, y, id_CARRY_START); - share_in = arch->add_wire(x, y, id_CARRY_START); - } else { - // Output of last tile - carry_in = arch->add_wire(x, y + 1, id_CO); - share_in = arch->add_wire(x, y + 1, id_SHAREOUT); + carry_in = arch->add_wire(x, y, id_CI); + share_in = arch->add_wire(x, y, id_SHAREIN); + if (y < (arch->getGridDimY() - 1)) { + // Carry is split at tile boundary (TTO_DIS bit), add a PIP to represent this. + // TODO: what about BTO_DIS, in the middle of the LAB? + arch->add_pip(arch->add_wire(x, y + 1, id_CO), carry_in); + arch->add_pip(arch->add_wire(x, y + 1, id_SHAREOUT), share_in); } } else { // Output from last combinational unit carry_in = arch->add_wire(x, y, arch->id(stringf("CARRY[%d]", (z * 2 + i) - 1))); share_in = arch->add_wire(x, y, arch->id(stringf("SHARE[%d]", (z * 2 + i) - 1))); } + if (z == 9 && i == 1) { carry_out = arch->add_wire(x, y, id_CO); share_out = arch->add_wire(x, y, id_SHAREOUT); @@ -582,7 +582,7 @@ static void assign_lut6_inputs(CellInfo *cell, int lut) if (!cell->ports.count(log) || cell->ports.at(log).net == nullptr) continue; cell->pin_data[log].bel_pins.clear(); - cell->pin_data[log].bel_pins.push_back(phys_pins.at(++phys_idx)); + cell->pin_data[log].bel_pins.push_back(phys_pins.at(phys_idx++)); } } } // namespace @@ -640,16 +640,19 @@ void Arch::reassign_alm_inputs(uint32_t lab, uint8_t alm) continue; // Work out which physical ports are available std::vector<IdString> avail_phys_ports; + // D/C always available and dedicated to the half, in L5 mode avail_phys_ports.push_back((i == 1) ? id_D : id_C); - if (b_avail) - avail_phys_ports.push_back(id_B); - if (a_avail) - avail_phys_ports.push_back(id_A); // In arithmetic mode, Ei can only be used for D0 and Fi can only be used for D1 + // otherwise, these are general and dedicated to one half if (!luts[i]->combInfo.is_carry) { avail_phys_ports.push_back((i == 1) ? id_E1 : id_E0); avail_phys_ports.push_back((i == 1) ? id_F1 : id_F0); } + // A and B might be used for shared signals, or already used by the other half + if (b_avail) + avail_phys_ports.push_back(id_B); + if (a_avail) + avail_phys_ports.push_back(id_A); int phys_idx = 0; for (int j = 0; j < luts[i]->combInfo.lut_input_count; j++) { |