diff --git a/ice40/arch.cc b/ice40/arch.cc
index a77dd611..86a9934c 100644
--- a/ice40/arch.cc
+++ b/ice40/arch.cc
@@ -361,6 +361,18 @@ bool Arch::is_bel_locked(BelId bel) const
     return false;
 }
 
+bool Arch::getBelHidden(BelId bel) const
+{
+    IdString bel_type = getBelType(bel);
+    if (bel_type == id_SB_IO) {
+        return get_bel_package_pin(bel).empty();
+    } else if (bel_type == id_ICESTORM_PLL) {
+        return is_bel_locked(bel);
+    } else {
+        return false;
+    }
+}
+
 // -----------------------------------------------------------------------
 
 WireId Arch::getWireByName(IdStringList name) const
diff --git a/ice40/arch.h b/ice40/arch.h
index e1009ddc..2e8940ad 100644
--- a/ice40/arch.h
+++ b/ice40/arch.h
@@ -523,6 +523,8 @@ struct Arch : BaseArch<ArchRanges>
     PortType getBelPinType(BelId bel, IdString pin) const override;
     std::vector<IdString> getBelPins(BelId bel) const override;
 
+    bool getBelHidden(BelId bel) const override;
+
     bool is_bel_locked(BelId bel) const;
 
     // -------------------------------------------------