diff options
Diffstat (limited to 'gowin/pack.cc')
| -rw-r--r-- | gowin/pack.cc | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/gowin/pack.cc b/gowin/pack.cc index 83820142..9f4b54e2 100644 --- a/gowin/pack.cc +++ b/gowin/pack.cc @@ -692,6 +692,95 @@ static void pack_gsr(Context *ctx) } } +// Pack shadow RAM +void pack_sram(Context *ctx) +{ + log_info("Packing Shadow RAM..\n"); + + pool<IdString> packed_cells; + std::vector<std::unique_ptr<CellInfo>> new_cells; + + for (auto &cell : ctx->cells) { + CellInfo *ci = cell.second.get(); + if (is_sram(ctx, ci)) { + + // Create RAMW slice + std::unique_ptr<CellInfo> ramw_slice = + create_generic_cell(ctx, id_RAMW, ci->name.str(ctx) + "$RAMW_SLICE"); + sram_to_ramw_split(ctx, ci, ramw_slice.get()); + ramw_slice->connectPort(id_CE, ctx->nets[ctx->id("$PACKER_VCC_NET")].get()); + + // Create actual RAM slices + std::unique_ptr<CellInfo> ram_comb[4]; + for (int i = 0; i < 4; i++) { + ram_comb[i] = create_generic_cell(ctx, id_SLICE, + ci->name.str(ctx) + "$SRAM_SLICE" + std::to_string(i)); + ram_comb[i]->params[id_FF_USED] = 1; + ram_comb[i]->params[id_FF_TYPE] = std::string("RAM"); + sram_to_slice(ctx, ci, ram_comb[i].get(), i); + } + // Create 'block' SLICEs as a placement hint that these cells are mutually exclusive with the RAMW + std::unique_ptr<CellInfo> ramw_block[2]; + for (int i = 0; i < 2; i++) { + ramw_block[i] = create_generic_cell(ctx, id_SLICE, + ci->name.str(ctx) + "$RAMW_BLOCK" + std::to_string(i)); + ram_comb[i]->params[id_FF_USED] = 1; + ramw_block[i]->params[id_FF_TYPE] = std::string("RAM"); + } + + // Disconnect ports of original cell after packing + // ci->disconnectPort(id_WCK); + // ci->disconnectPort(id_WRE); + + for (int i = 0; i < 4; i++) + ci->disconnectPort(ctx->id(stringf("RAD[%d]", i))); + + // Setup placement constraints + // Use the 0th bit as an anchor + ram_comb[0]->constr_abs_z = true; + ram_comb[0]->constr_z = 0; + ram_comb[0]->cluster = ram_comb[0]->name; + for (int i = 1; i < 4; i++) { + ram_comb[i]->cluster = ram_comb[0]->name; + ram_comb[i]->constr_abs_z = true; + ram_comb[i]->constr_x = 0; + ram_comb[i]->constr_y = 0; + ram_comb[i]->constr_z = i; + ram_comb[0]->constr_children.push_back(ram_comb[i].get()); + } + for (int i = 0; i < 2; i++) { + ramw_block[i]->cluster = ram_comb[0]->name; + ramw_block[i]->constr_abs_z = true; + ramw_block[i]->constr_x = 0; + ramw_block[i]->constr_y = 0; + ramw_block[i]->constr_z = i + 4; + ram_comb[0]->constr_children.push_back(ramw_block[i].get()); + } + + ramw_slice->cluster = ram_comb[0]->name; + ramw_slice->constr_abs_z = true; + ramw_slice->constr_x = 0; + ramw_slice->constr_y = 0; + ramw_slice->constr_z = BelZ::lutram_0_z; + ram_comb[0]->constr_children.push_back(ramw_slice.get()); + + for (int i = 0; i < 4; i++) + new_cells.push_back(std::move(ram_comb[i])); + for (int i = 0; i < 2; i++) + new_cells.push_back(std::move(ramw_block[i])); + new_cells.push_back(std::move(ramw_slice)); + packed_cells.insert(ci->name); + } + } + for (auto pcell : packed_cells) { + ctx->cells.erase(pcell); + } + for (auto &ncell : new_cells) { + ctx->cells[ncell->name] = std::move(ncell); + } +} + + static bool is_nextpnr_iob(const Context *ctx, CellInfo *cell) { return cell->type == ctx->id("$nextpnr_ibuf") || cell->type == ctx->id("$nextpnr_obuf") || @@ -1010,6 +1099,7 @@ bool Arch::pack() try { log_break(); pack_constants(ctx); + pack_sram(ctx); pack_gsr(ctx); pack_io(ctx); pack_diff_io(ctx); |