caiyu/nextpnr
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add initial constant network support to FPGA interchange arch.

Browse Source 
Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>
This commit is contained in:
Keith Rothman 2021-02-17 18:08:26 -08:00
parent 0758f68020
commit 40df4f4f65
2 changed files with 47 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fpga_interchange/arch.cc
View File

@ -217,7 +217,7 @@ void Arch::setup_byname() const
for (int i = 0; i < chip_info->tiles.ssize(); i++) {
auto &tile = chip_info->tiles[i];
auto &tile_type = chip_info->tile_types[tile.type];
for (int j = 0; j < tile_type.number_sites; j++) {
for (int j = 0; j < tile_type.site_types.size(); j++) {
auto &site = chip_info->sites[tile.sites[j]];
site_by_name[id(site.name.get())] = std::make_pair(i, j);
}

52
fpga_interchange/arch.h
View File

@ -120,8 +120,6 @@ NPNR_PACKED_STRUCT(struct ConstraintTagPOD {
NPNR_PACKED_STRUCT(struct TileTypeInfoPOD {
int32_t name; // Tile type constid
int32_t number_sites;
RelSlice<BelInfoPOD> bel_data;
RelSlice<TileWireInfoPOD> wire_data;
@ -129,6 +127,8 @@ NPNR_PACKED_STRUCT(struct TileTypeInfoPOD {
RelSlice<PipInfoPOD> pip_data;
RelSlice<ConstraintTagPOD> tags;
RelSlice<int32_t> site_types;
});
NPNR_PACKED_STRUCT(struct SiteInstInfoPOD {
@ -147,7 +147,7 @@ NPNR_PACKED_STRUCT(struct TileInstInfoPOD {
// Index into root.tile_types.
int32_t type;
// This array is root.tile_types[type].number_sites long.
// This array is root.tile_types[type].site_types.size() long.
// Index into root.sites
RelSlice<int32_t> sites;
@ -207,6 +207,29 @@ NPNR_PACKED_STRUCT(struct PackagePOD {
RelSlice<PackagePinPOD> pins;
});
NPNR_PACKED_STRUCT(struct ConstantsPOD {
// Cell type and port for the GND and VCC global source.
int32_t gnd_cell_name; // constid
int32_t gnd_cell_port; // constid
int32_t vcc_cell_name; // constid
int32_t vcc_cell_port; // constid
int32_t gnd_bel_tile;
int32_t gnd_bel_index;
int32_t gnd_bel_pin; // constid
int32_t vcc_bel_tile;
int32_t vcc_bel_index;
int32_t vcc_bel_pin; // constid
// Name to use for the global GND constant net
int32_t gnd_net_name; // constid
// Name to use for the global VCC constant net
int32_t vcc_net_name; // constid
});
NPNR_PACKED_STRUCT(struct ChipInfoPOD {
RelPtr<char> name;
RelPtr<char> generator;
@ -224,6 +247,7 @@ NPNR_PACKED_STRUCT(struct ChipInfoPOD {
RelSlice<int32_t> bel_buckets;
RelPtr<CellMapPOD> cell_map;
RelPtr<ConstantsPOD> constants;
// Constid string data.
RelPtr<RelSlice<RelPtr<char>>> constids;
@ -822,7 +846,7 @@ struct Arch : ArchAPI<ArchRanges>
}
int getTilePipDimZ(int x, int y) const override
{
return chip_info->tile_types[chip_info->tiles[get_tile_index(x, y)].type].number_sites;
return chip_info->tile_types[chip_info->tiles[get_tile_index(x, y)].type].site_types.size();
}
char getNameDelimiter() const override { return '/'; }
@ -855,8 +879,8 @@ struct Arch : ArchAPI<ArchRanges>
result.first->second.boundcells.resize(tile_type.bel_data.size());
result.first->second.tags.resize(default_tags.size());
result.first->second.sites.reserve(tile_type.number_sites);
for (size_t i = 0; i < (size_t)tile_type.number_sites; ++i) {
result.first->second.sites.reserve(tile_type.site_types.size());
for (size_t i = 0; i < tile_type.site_types.size(); ++i) {
result.first->second.sites.push_back(SiteRouter(i));
}
}
@ -874,6 +898,22 @@ struct Arch : ArchAPI<ArchRanges>
return tile_status.sites.at(bel_data.site);
}
BelId get_vcc_bel() const {
auto &constants = chip_info->constants;
BelId bel;
bel.tile = constants->vcc_bel_tile;
bel.index = constants->vcc_bel_pin;
return bel;
}
BelId get_gnd_bel() const {
auto &constants = chip_info->constants;
BelId bel;
bel.tile = constants->gnd_bel_tile;
bel.index = constants->gnd_bel_pin;
return bel;
}
void bindBel(BelId bel, CellInfo *cell, PlaceStrength strength) override
{
NPNR_ASSERT(bel != BelId());