nmigen.build.res: Ensure all pins are available in a DiffPairs (fixing …

…amaranth-lang#456)
jeanthom · Jul 31, 2020 · 3aa6669 · 3aa6669
1 parent 07dc163
commit 3aa6669
Showing 1 changed file with 9 additions and 3 deletions.
diff --git a/nmigen/build/res.py b/nmigen/build/res.py
@@ -128,9 +128,15 @@ def resolve(resource, dir, xdr, name, attrs):
                     phys_names = phys.names
                     port = Record([("io", len(phys))], name=name)
                 if isinstance(phys, DiffPairs):
-                    phys_names = phys.p.names + phys.n.names
-                    port = Record([("p", len(phys)),
-                                   ("n", len(phys))], name=name)
+                    phys_names = []
+                    record_fields = []
+                    if not self.should_skip_port_component(None, attrs, "p"):
+                        phys_names += phys.p.names
+                        record_fields.append(("p", len(phys)))
+                    if not self.should_skip_port_component(None, attrs, "n"):
+                        phys_names += phys.n.names
+                        record_fields.append(("n", len(phys)))
+                    port = Record(record_fields, name=name)
                 if dir == "-":
                     pin = None
                 else: