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-rw-r--r--ecp5/bitstream.cc278
1 files changed, 265 insertions, 13 deletions
diff --git a/ecp5/bitstream.cc b/ecp5/bitstream.cc
index 29b12c86..c7b5d562 100644
--- a/ecp5/bitstream.cc
+++ b/ecp5/bitstream.cc
@@ -21,6 +21,7 @@
#include <fstream>
#include <iomanip>
+#include <queue>
#include <regex>
#include <streambuf>
@@ -81,17 +82,20 @@ static std::vector<bool> str_to_bitvector(std::string str, int size)
static void tie_cib_signal(Context *ctx, ChipConfig &cc, WireId wire, bool value)
{
static const std::regex cib_re("J([A-D]|CE|LSR|CLK)[0-7]");
- WireId cibsig = wire;
- std::string basename = ctx->getWireBasename(wire).str(ctx);
-
- while (!std::regex_match(basename, cib_re)) {
- auto uphill = ctx->getPipsUphill(cibsig);
- NPNR_ASSERT(uphill.begin() != uphill.end()); // At least one uphill pip
- auto iter = uphill.begin();
- cibsig = ctx->getPipSrcWire(*iter);
+ std::queue<WireId> signals;
+ signals.push(wire);
+ WireId cibsig;
+ std::string basename;
+ while (true) {
+ NPNR_ASSERT(!signals.empty());
+ NPNR_ASSERT(signals.size() < 100);
+ cibsig = signals.front();
basename = ctx->getWireBasename(cibsig).str(ctx);
- ++iter;
- NPNR_ASSERT(!(iter != uphill.end())); // Exactly one uphill pip
+ signals.pop();
+ if (std::regex_match(basename, cib_re))
+ break;
+ for (auto pip : ctx->getPipsUphill(cibsig))
+ signals.push(ctx->getPipSrcWire(pip));
}
bool out_value = value;
@@ -132,9 +136,12 @@ std::vector<bool> parse_init_str(const std::string &str, int length)
char c = str.at((str.size() - i) - 1);
int nibble = chtohex(c);
result.at(i * 4) = nibble & 0x1;
- result.at(i * 4 + 1) = nibble & 0x2;
- result.at(i * 4 + 2) = nibble & 0x4;
- result.at(i * 4 + 3) = nibble & 0x8;
+ if (i * 4 + 1 < length)
+ result.at(i * 4 + 1) = nibble & 0x2;
+ if (i * 4 + 2 < length)
+ result.at(i * 4 + 2) = nibble & 0x4;
+ if (i * 4 + 3 < length)
+ result.at(i * 4 + 3) = nibble & 0x8;
}
} else {
// Yosys style binary string
@@ -279,6 +286,98 @@ std::vector<std::string> get_bram_tiles(Context *ctx, BelId bel)
return tiles;
}
+// Get the list of tiles corresponding to a DSP
+std::vector<std::string> get_dsp_tiles(Context *ctx, BelId bel)
+{
+ std::vector<std::string> tiles;
+ Loc loc = ctx->getBelLocation(bel);
+
+ static const std::set<std::string> dsp8 = {"MIB_DSP8", "DSP_SPINE_UL0", "DSP_SPINE_UR0", "DSP_SPINE_UR1"};
+ if (ctx->getBelType(bel) == id_MULT18X18D) {
+ switch (loc.z) {
+ case 0:
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB_DSP0"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB2_DSP0"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB_DSP1"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB2_DSP1"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 2, "MIB_DSP2"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 2, "MIB2_DSP2"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 3, "MIB_DSP3"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 3, "MIB2_DSP3"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 4, "MIB_DSP4"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 4, "MIB2_DSP4"));
+ break;
+ case 1:
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 1, "MIB_DSP0"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 1, "MIB2_DSP0"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB_DSP1"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB2_DSP1"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB_DSP2"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB2_DSP2"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 2, "MIB_DSP3"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 2, "MIB2_DSP3"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 3, "MIB_DSP4"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 3, "MIB2_DSP4"));
+ break;
+ case 4:
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB_DSP4"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB2_DSP4"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB_DSP5"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB2_DSP5"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 2, "MIB_DSP6"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 2, "MIB2_DSP6"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 3, "MIB_DSP7"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 3, "MIB2_DSP7"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 4, dsp8));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 4, "MIB2_DSP8"));
+ break;
+ case 5:
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 1, "MIB_DSP4"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 1, "MIB2_DSP4"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB_DSP5"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB2_DSP5"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB_DSP6"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB2_DSP6"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 2, "MIB_DSP7"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 2, "MIB2_DSP7"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 3, dsp8));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 3, "MIB2_DSP8"));
+ break;
+ default:
+ NPNR_ASSERT_FALSE("bad MULT z loc");
+ }
+ } else if (ctx->getBelType(bel) == id_ALU54B) {
+ switch (loc.z) {
+ case 3:
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 3, "MIB_DSP0"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 3, "MIB2_DSP0"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 2, "MIB_DSP1"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 2, "MIB2_DSP1"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 1, "MIB_DSP2"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 1, "MIB2_DSP2"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB_DSP3"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB2_DSP3"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB_DSP4"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB2_DSP4"));
+ break;
+ case 7:
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 3, "MIB_DSP4"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 3, "MIB2_DSP4"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 2, "MIB_DSP5"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 2, "MIB2_DSP5"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 1, "MIB_DSP6"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x - 1, "MIB2_DSP6"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB_DSP7"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, "MIB2_DSP7"));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, dsp8));
+ tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x + 1, "MIB2_DSP8"));
+ break;
+ default:
+ NPNR_ASSERT_FALSE("bad ALU z loc");
+ }
+ }
+ return tiles;
+}
void fix_tile_names(Context *ctx, ChipConfig &cc)
{
// Remove the V prefix/suffix on certain tiles if device is a SERDES variant
@@ -312,6 +411,24 @@ void fix_tile_names(Context *ctx, ChipConfig &cc)
}
}
+void tieoff_dsp_ports(Context *ctx, ChipConfig &cc, CellInfo *ci)
+{
+ for (auto port : ci->ports) {
+ if (port.second.net == nullptr && port.second.type == PORT_IN) {
+ if (port.first.str(ctx).substr(0, 3) == "CLK" || port.first.str(ctx).substr(0, 2) == "CE" ||
+ port.first.str(ctx).substr(0, 3) == "RST" || port.first.str(ctx).substr(0, 3) == "SRO" ||
+ port.first.str(ctx).substr(0, 3) == "SRI" || port.first.str(ctx).substr(0, 2) == "RO" ||
+ port.first.str(ctx).substr(0, 2) == "MA" || port.first.str(ctx).substr(0, 2) == "MB" ||
+ port.first.str(ctx).substr(0, 3) == "CFB" || port.first.str(ctx).substr(0, 3) == "CIN" ||
+ port.first.str(ctx).substr(0, 6) == "SOURCE" || port.first.str(ctx).substr(0, 6) == "SIGNED" ||
+ port.first.str(ctx).substr(0, 2) == "OP")
+ continue;
+ bool value = bool_or_default(ci->params, ctx->id(port.first.str(ctx) + "MUX"), false);
+ tie_cib_signal(ctx, cc, ctx->getBelPinWire(ci->bel, port.first), value);
+ }
+ }
+}
+
void write_bitstream(Context *ctx, std::string base_config_file, std::string text_config_file)
{
ChipConfig cc;
@@ -617,10 +734,145 @@ void write_bitstream(Context *ctx, std::string base_config_file, std::string tex
NPNR_ASSERT(!cc.bram_data.count(wid));
cc.bram_data[wid] = init_data;
cc.tilegroups.push_back(tg);
+ } else if (ci->type == id_MULT18X18D) {
+ TileGroup tg;
+ Loc loc = ctx->getBelLocation(ci->bel);
+ tg.tiles = get_dsp_tiles(ctx, ci->bel);
+ std::string dsp = "MULT18_" + std::to_string(loc.z);
+ tg.config.add_enum(dsp + ".REG_INPUTA_CLK", str_or_default(ci->params, ctx->id("REG_INPUTA_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_INPUTA_CE", str_or_default(ci->params, ctx->id("REG_INPUTA_CE"), "CE0"));
+ tg.config.add_enum(dsp + ".REG_INPUTA_RST", str_or_default(ci->params, ctx->id("REG_INPUTA_RST"), "RST0"));
+ tg.config.add_enum(dsp + ".REG_INPUTB_CLK", str_or_default(ci->params, ctx->id("REG_INPUTB_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_INPUTB_CE", str_or_default(ci->params, ctx->id("REG_INPUTB_CE"), "CE0"));
+ tg.config.add_enum(dsp + ".REG_INPUTB_RST", str_or_default(ci->params, ctx->id("REG_INPUTB_RST"), "RST0"));
+ tg.config.add_enum(dsp + ".REG_INPUTC_CLK", str_or_default(ci->params, ctx->id("REG_INPUTC_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_PIPELINE_CLK",
+ str_or_default(ci->params, ctx->id("REG_PIPELINE_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_PIPELINE_CE", str_or_default(ci->params, ctx->id("REG_PIPELINE_CE"), "CE0"));
+ tg.config.add_enum(dsp + ".REG_PIPELINE_RST",
+ str_or_default(ci->params, ctx->id("REG_PIPELINE_RST"), "RST0"));
+ tg.config.add_enum(dsp + ".REG_OUTPUT_CLK", str_or_default(ci->params, ctx->id("REG_OUTPUT_CLK"), "NONE"));
+ if (dsp == "MULT18_0" || dsp == "MULT18_4")
+ tg.config.add_enum(dsp + ".REG_OUTPUT_RST",
+ str_or_default(ci->params, ctx->id("REG_OUTPUT_RST"), "RST0"));
+
+ tg.config.add_enum(dsp + ".CLK0_DIV", str_or_default(ci->params, ctx->id("CLK0_DIV"), "ENABLED"));
+ tg.config.add_enum(dsp + ".CLK1_DIV", str_or_default(ci->params, ctx->id("CLK1_DIV"), "ENABLED"));
+ tg.config.add_enum(dsp + ".CLK2_DIV", str_or_default(ci->params, ctx->id("CLK2_DIV"), "ENABLED"));
+ tg.config.add_enum(dsp + ".CLK3_DIV", str_or_default(ci->params, ctx->id("CLK3_DIV"), "ENABLED"));
+ tg.config.add_enum(dsp + ".GSR", str_or_default(ci->params, ctx->id("GSR"), "ENABLED"));
+ tg.config.add_enum(dsp + ".SOURCEB_MODE", str_or_default(ci->params, ctx->id("SOURCEB_MODE"), "B_SHIFT"));
+ tg.config.add_enum(dsp + ".RESETMODE", str_or_default(ci->params, ctx->id("RESETMODE"), "SYNC"));
+
+ tg.config.add_enum(dsp + ".MODE", "MULT18X18D");
+ if (str_or_default(ci->params, ctx->id("REG_OUTPUT_CLK"), "NONE") == "NONE")
+ tg.config.add_enum(dsp + ".CIBOUT_BYP", "ON");
+
+ if (loc.z < 4)
+ tg.config.add_enum("DSP_LEFT.CIBOUT", "ON");
+ else
+ tg.config.add_enum("DSP_RIGHT.CIBOUT", "ON");
+
+ // Some muxes default to INV, make all pass-thru
+ for (auto port : {"CLK", "CE", "RST"}) {
+ for (int i = 0; i < 4; i++) {
+ std::string sig = port + std::to_string(i);
+ tg.config.add_enum(dsp + "." + sig + "MUX", sig);
+ }
+ }
+
+ tieoff_dsp_ports(ctx, cc, ci);
+ cc.tilegroups.push_back(tg);
+
+ } else if (ci->type == id_ALU54B) {
+ TileGroup tg;
+ Loc loc = ctx->getBelLocation(ci->bel);
+ tg.tiles = get_dsp_tiles(ctx, ci->bel);
+ std::string dsp = "ALU54_" + std::to_string(loc.z);
+ tg.config.add_enum(dsp + ".REG_INPUTC0_CLK",
+ str_or_default(ci->params, ctx->id("REG_INPUTC0_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_INPUTC1_CLK",
+ str_or_default(ci->params, ctx->id("REG_INPUTC1_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_OPCODEOP0_0_CLK",
+ str_or_default(ci->params, ctx->id("REG_OPCODEOP0_0_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_OPCODEOP0_0_CE",
+ str_or_default(ci->params, ctx->id("REG_OPCODEOP0_0_CE"), "CE0"));
+ tg.config.add_enum(dsp + ".REG_OPCODEOP0_0_RST",
+ str_or_default(ci->params, ctx->id("REG_OPCODEOP0_0_RST"), "RST0"));
+ tg.config.add_enum(dsp + ".REG_OPCODEOP1_0_CLK",
+ str_or_default(ci->params, ctx->id("REG_OPCODEOP1_0_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_OPCODEOP0_1_CLK",
+ str_or_default(ci->params, ctx->id("REG_OPCODEOP0_1_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_OPCODEOP0_1_CE",
+ str_or_default(ci->params, ctx->id("REG_OPCODEOP0_1_CE"), "CE0"));
+ tg.config.add_enum(dsp + ".REG_OPCODEOP0_1_RST",
+ str_or_default(ci->params, ctx->id("REG_OPCODEOP0_1_RST"), "RST0"));
+ tg.config.add_enum(dsp + ".REG_OPCODEIN_0_CLK",
+ str_or_default(ci->params, ctx->id("REG_OPCODEIN_0_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_OPCODEIN_0_CE",
+ str_or_default(ci->params, ctx->id("REG_OPCODEIN_0_CE"), "CE0"));
+ tg.config.add_enum(dsp + ".REG_OPCODEIN_0_RST",
+ str_or_default(ci->params, ctx->id("REG_OPCODEIN_0_RST"), "RST0"));
+ tg.config.add_enum(dsp + ".REG_OPCODEIN_1_CLK",
+ str_or_default(ci->params, ctx->id("REG_OPCODEIN_1_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_OPCODEIN_1_CE",
+ str_or_default(ci->params, ctx->id("REG_OPCODEIN_1_CE"), "CE0"));
+ tg.config.add_enum(dsp + ".REG_OPCODEIN_1_RST",
+ str_or_default(ci->params, ctx->id("REG_OPCODEIN_1_RST"), "RST0"));
+ tg.config.add_enum(dsp + ".REG_OUTPUT0_CLK",
+ str_or_default(ci->params, ctx->id("REG_OUTPUT0_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_OUTPUT1_CLK",
+ str_or_default(ci->params, ctx->id("REG_OUTPUT1_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".REG_FLAG_CLK", str_or_default(ci->params, ctx->id("REG_FLAG_CLK"), "NONE"));
+ tg.config.add_enum(dsp + ".MCPAT_SOURCE", str_or_default(ci->params, ctx->id("MCPAT_SOURCE"), "STATIC"));
+ tg.config.add_enum(dsp + ".MASKPAT_SOURCE",
+ str_or_default(ci->params, ctx->id("MASKPAT_SOURCE"), "STATIC"));
+ tg.config.add_word(dsp + ".MASK01",
+ parse_init_str(str_or_default(ci->params, ctx->id("MASK01"), "0x00000000000000"), 56));
+ tg.config.add_enum(dsp + ".CLK0_DIV", str_or_default(ci->params, ctx->id("CLK0_DIV"), "ENABLED"));
+ tg.config.add_enum(dsp + ".CLK1_DIV", str_or_default(ci->params, ctx->id("CLK1_DIV"), "ENABLED"));
+ tg.config.add_enum(dsp + ".CLK2_DIV", str_or_default(ci->params, ctx->id("CLK2_DIV"), "ENABLED"));
+ tg.config.add_enum(dsp + ".CLK3_DIV", str_or_default(ci->params, ctx->id("CLK3_DIV"), "ENABLED"));
+ tg.config.add_word(dsp + ".MCPAT",
+ parse_init_str(str_or_default(ci->params, ctx->id("MCPAT"), "0x00000000000000"), 56));
+ tg.config.add_word(dsp + ".MASKPAT",
+ parse_init_str(str_or_default(ci->params, ctx->id("MASKPAT"), "0x00000000000000"), 56));
+ tg.config.add_word(dsp + ".RNDPAT",
+ parse_init_str(str_or_default(ci->params, ctx->id("RNDPAT"), "0x00000000000000"), 56));
+ tg.config.add_enum(dsp + ".GSR", str_or_default(ci->params, ctx->id("GSR"), "ENABLED"));
+ tg.config.add_enum(dsp + ".RESETMODE", str_or_default(ci->params, ctx->id("RESETMODE"), "SYNC"));
+ tg.config.add_enum(dsp + ".FORCE_ZERO_BARREL_SHIFT",
+ str_or_default(ci->params, ctx->id("FORCE_ZERO_BARREL_SHIFT"), "DISABLED"));
+ tg.config.add_enum(dsp + ".LEGACY", str_or_default(ci->params, ctx->id("LEGACY"), "DISABLED"));
+
+ tg.config.add_enum(dsp + ".MODE", "ALU54B");
+
+ if (loc.z < 4)
+ tg.config.add_enum("DSP_LEFT.CIBOUT", "ON");
+ else
+ tg.config.add_enum("DSP_RIGHT.CIBOUT", "ON");
+ if (str_or_default(ci->params, ctx->id("REG_FLAG_CLK"), "NONE") == "NONE") {
+ if (dsp == "ALU54_7") {
+ tg.config.add_enum("MULT18_5.CIBOUT_BYP", "ON");
+ } else if (dsp == "ALU54_3") {
+ tg.config.add_enum("MULT18_5.CIBOUT_BYP", "ON");
+ }
+ }
+ if (str_or_default(ci->params, ctx->id("REG_OUTPUT0_CLK"), "NONE") == "NONE") {
+ if (dsp == "ALU54_7") {
+ tg.config.add_enum("MULT18_4.CIBOUT_BYP", "ON");
+ } else if (dsp == "ALU54_3") {
+ tg.config.add_enum("MULT18_0.CIBOUT_BYP", "ON");
+ }
+ }
+ tieoff_dsp_ports(ctx, cc, ci);
+ cc.tilegroups.push_back(tg);
+
} else {
NPNR_ASSERT_FALSE("unsupported cell type");
}
}
+
// Fixup tile names
fix_tile_names(ctx, cc);
// Configure chip