diff --git a/common/place_common.cc b/common/place_common.cc
index b3eb4267..2a18a1a2 100644
--- a/common/place_common.cc
+++ b/common/place_common.cc
@@ -37,6 +37,8 @@ wirelen_t get_net_metric(const Context *ctx, const NetInfo *net, MetricType type
     if (driver_gb)
         return 0;
     int clock_count;
+    if (ctx->getPortTimingClass(driver_cell, net->driver.port, clock_count) == TMG_IGNORE)
+	return 0;
     bool timing_driven = ctx->timing_driven && type == MetricType::COST &&
                          ctx->getPortTimingClass(driver_cell, net->driver.port, clock_count) != TMG_IGNORE;
     delay_t negative_slack = 0;
diff --git a/xc7/arch.cc b/xc7/arch.cc
index 59510591..f33c72ee 100644
--- a/xc7/arch.cc
+++ b/xc7/arch.cc
@@ -102,6 +102,12 @@ TorcInfo::TorcInfo(BaseCtx *ctx, const std::string &inDeviceName, const std::str
             bel_to_loc.emplace_back(x, y, 0);
             site_index_to_bel[i] = b;
             ++b.index;
+        } else if (type == "IOB18S" || type == "IOB18M") {
+            bel_to_site_index.push_back(i);
+            site_index_to_type[i] = id_IOB18;
+            bel_to_loc.emplace_back(x, y, 0);
+            site_index_to_bel[i] = b;
+            ++b.index;
         } else {
             bel_to_site_index.push_back(i);
             site_index_to_type[i] = ctx->id(type);
@@ -337,6 +343,8 @@ Arch::Arch(ArchArgs args) : args(args)
             }
 #endif
         }
+    } else if (args.type == ArchArgs::VX980) {
+        torc_info = std::unique_ptr<TorcInfo>(new TorcInfo(this, "xc7vx980t", args.package));
     } else {
         log_error("Unsupported XC7 chip type.\n");
     }
@@ -922,7 +930,7 @@ TimingPortClass Arch::getPortTimingClass(const CellInfo *cell, IdString port, in
         }
         // TODO
         // if (port == id_OMUX)
-    } else if (cell->type == id_IOB33) {
+    } else if (cell->type == id_IOB33 || cell->type == id_IOB18) {
         if (port == id_I)
             return TMG_STARTPOINT;
         else if (port == id_O)
diff --git a/xc7/arch.h b/xc7/arch.h
index fe89208b..1d4af94f 100644
--- a/xc7/arch.h
+++ b/xc7/arch.h
@@ -489,7 +489,8 @@ struct ArchArgs
     enum ArchArgsTypes
     {
         NONE,
-        Z020
+        Z020,
+        VX980
     } type = NONE;
     std::string package;
 };
diff --git a/xc7/cells.cc b/xc7/cells.cc
index 297c45f1..817fbab6 100644
--- a/xc7/cells.cc
+++ b/xc7/cells.cc
@@ -70,11 +70,15 @@ std::unique_ptr<CellInfo> create_xc7_cell(Context *ctx, IdString type, std::stri
         add_port(ctx, new_cell.get(), "OMUX", PORT_OUT);
         add_port(ctx, new_cell.get(), "COUT", PORT_OUT);
     } else if (type == ctx->id("IOBUF")) {
-        new_cell->type = id_IOB33;
-        new_cell->params[ctx->id("PIN_TYPE")] = "0";
-        new_cell->params[ctx->id("PULLUP")] = "0";
-        new_cell->params[ctx->id("NEG_TRIGGER")] = "0";
-        new_cell->params[ctx->id("IOSTANDARD")] = "SB_LVCMOS";
+	if (ctx->args.type == ArchArgs::Z020) {
+		new_cell->type = id_IOB33;
+	} else {
+		new_cell->type = id_IOB18;
+	}
+        //new_cell->params[ctx->id("PIN_TYPE")] = "0";
+        //new_cell->params[ctx->id("PULLUP")] = "0";
+        //new_cell->params[ctx->id("NEG_TRIGGER")] = "0";
+        //new_cell->params[ctx->id("IOSTANDARD")] = "SB_LVCMOS";
 
         //        add_port(ctx, new_cell.get(), "PACKAGE_PIN", PORT_INOUT);
         //
diff --git a/xc7/constids.inc b/xc7/constids.inc
index 0bc012b3..d9fee532 100644
--- a/xc7/constids.inc
+++ b/xc7/constids.inc
@@ -458,5 +458,6 @@ X(FDPE)
 X(BUFGCTRL)
 X(SLICE_LUT6)
 X(IOB33)
+X(IOB18)
 X(PS7)
 X(MMCME2_ADV)
diff --git a/xc7/main.cc b/xc7/main.cc
index 65fabff4..cac9a397 100644
--- a/xc7/main.cc
+++ b/xc7/main.cc
@@ -51,8 +51,9 @@ Xc7CommandHandler::Xc7CommandHandler(int argc, char **argv) : CommandHandler(arg
 po::options_description Xc7CommandHandler::getArchOptions()
 {
     po::options_description specific("Architecture specific options");
-    specific.add_options()("xc7z020", "set device type to xc7z020");
-    //    specific.add_options()("package", po::value<std::string>(), "set device package");
+    specific.add_options()("z020", "set device type to xc7z020");
+    specific.add_options()("vx980", "set device type to xc7v980");
+    specific.add_options()("package", po::value<std::string>(), "set device package");
     specific.add_options()("pcf", po::value<std::string>(), "PCF constraints file to ingest");
     specific.add_options()("xdl", po::value<std::string>(), "XDL file to write");
     //    specific.add_options()("tmfuzz", "run path delay estimate fuzzer");
@@ -97,6 +98,12 @@ std::unique_ptr<Context> Xc7CommandHandler::createContext()
         chipArgs.package = "clg400";
     }
 
+    if (vm.count("vx980")) {
+        chipArgs.type = ArchArgs::VX980;
+        chipArgs.package = "ffg1926";
+    }
+
+
     if (chipArgs.type == ArchArgs::NONE) {
         chipArgs.type = ArchArgs::Z020;
         chipArgs.package = "clg400";
diff --git a/xc7/xdl.cc b/xc7/xdl.cc
index ea834593..63d67749 100644
--- a/xc7/xdl.cc
+++ b/xc7/xdl.cc
@@ -68,7 +68,7 @@ void write_xdl(const Context *ctx, std::ostream &out)
         const char *type;
         if (cell.second->type == id_SLICE_LUT6)
             type = "SLICEL";
-        else if (cell.second->type == id_IOB33 || cell.second->type == id_BUFGCTRL || cell.second->type == id_PS7 || cell.second->type == id_MMCME2_ADV)
+        else if (cell.second->type == id_IOB33 || cell.second->type == id_IOB18 || cell.second->type == id_BUFGCTRL || cell.second->type == id_PS7 || cell.second->type == id_MMCME2_ADV)
             type = cell.second->type.c_str(ctx);
         else
             log_error("Unsupported cell type '%s'.\n", cell.second->type.c_str(ctx));
@@ -111,7 +111,7 @@ void write_xdl(const Context *ctx, std::ostream &out)
             // Assume from Yosys that INIT masks of less than 32 bits are output as uint32_t
             if (lut_inputs.size() < 6) {
                 auto init_as_uint = boost::lexical_cast<uint32_t>(init);
-                NPNR_ASSERT(init_as_uint < (1ull << (1u << lut_inputs.size())));
+                NPNR_ASSERT(init_as_uint <= (1ull << (1u << lut_inputs.size())));
                 if (lut_inputs.empty())
                     value += init;
                 else {
@@ -198,6 +198,17 @@ void write_xdl(const Context *ctx, std::ostream &out)
         } else if (cell.second->type == id_BUFGCTRL || cell.second->type == id_PS7 || cell.second->type == id_MMCME2_ADV) {
             for (const auto& i : cell.second->params)
                 instPtr->setConfig(i.first.str(ctx), "", i.second);
+        } else if (cell.second->type == id_IOB18) {
+            if (get_net_or_empty(cell.second.get(), id_I)) {
+                instPtr->setConfig("IUSED", "", "0");
+                instPtr->setConfig("IBUF_LOW_PWR", "", "TRUE");
+                instPtr->setConfig("ISTANDARD", "", "LVCMOS18");
+            } else {
+                instPtr->setConfig("OUSED", "", "0");
+                instPtr->setConfig("OSTANDARD", "", "LVCMOS18");
+                instPtr->setConfig("DRIVE", "", "12");
+                instPtr->setConfig("SLEW", "", "SLOW");
+            }
         } else
             log_error("Unsupported cell type '%s'.\n", cell.second->type.c_str(ctx));
     }