gsd_butterstick: Add SYZYGY0/1 IOs to connectors.

litex_boards/platforms/gsd_butterstick.py

@@ -79,7 +79,42 @@ _io_r1_0 = [
 
 # Connectors ---------------------------------------------------------------------------------------
 
-_connectors_r1_0 = []
+_connectors_r1_0 = [
+    ("SYZYGY0", {
+        # Single ended IOs.
+        "S0":"G2",  "S1":"J3",
+        "S2":"F1",  "S3":"K3",
+        "S4":"J4",  "S5":"K2",
+        "S6":"J5",  "S7":"J1",
+        "S8":"N2",  "S9":"L3",
+        "S10":"M1", "S11":"L2",
+        "S12":"N3", "S13":"N4",
+        "S14":"M3", "S15":"P5",
+        "S16":"H1", "S17":"K5",
+        "S18":"K4", "S19":"K1",
+        "S20":"L4", "S21":"L1",
+        "S22":"L5", "S23":"M4",
+        "S24":"N1", "S25":"N5",
+        "S26":"P3", "S27":"P4",
+        "S28":"H2", "S29":"P1",
+        "S30":"G1", "S31":"P2",
+        # Diff pairs IOs.
+        }
+    ),
+    ("SYZYGY1", {
+        # Single ended IOs.
+        # Diff pairs IOs.
+        "D0P":"E4", "D0N":"D5",
+        "D1P":"A4", "D1N":"A5",
+        "D2P":"C4", "D2N":"B4",
+        "D3P":"B2", "D3N":"C2",
+        "D4P":"A2", "D4N":"B1",
+        "D5P":"C1", "D5N":"D1",
+        "D6P":"F4", "D6N":"E3",
+        "D7P":"D2", "D7N":"E1",
+        }
+    ),
+]
 
 # Platform -----------------------------------------------------------------------------------------