diff --git a/litex_boards/platforms/gsd_butterstick.py b/litex_boards/platforms/gsd_butterstick.py
index c3d6e34..183614b 100644
--- a/litex_boards/platforms/gsd_butterstick.py
+++ b/litex_boards/platforms/gsd_butterstick.py
@@ -108,7 +108,7 @@ _io_r1_0 = [
 
 _connectors_r1_0 = [
     ("SYZYGY0", {
-        # Single ended IOs.
+        # single ended
         "S0":"G2",  "S1":"J3",
         "S2":"F1",  "S3":"K3",
         "S4":"J4",  "S5":"K2",
@@ -125,20 +125,37 @@ _connectors_r1_0 = [
         "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",
+        # single ended
+        "S0":"E4", "S1":"A4", 
+        "S2":"D5", "S3":"A5",
+        "S4":"C4", "S5":"B2", 
+        "S6":"B4", "S7":"C2", 
+        "S8":"A2", "S9":"C1", 
+        "S10":"B1", "S11":"D1", 
+        "S12":"F4", "S13":"D2", 
+        "S14":"E3", "S15":"E1", 
+        "S16":"B5", "S17":"E5", 
+        "S18":"F5", "S19":"C5", 
+        "S20":"B3", "S21":"A3", 
+        "S22":"D3", "S23":"C3", 
+        "S24":"H5", "S25":"G5", 
+        "S26":"H3", "S27":"H4", 
+        "S28":"G3", "S29":"F2", 
+        "S30":"F3", "S31":"E2",
+        }
+    ),
+    ("SYZYGY2", {
+        # single ended
+        "S0":"C11", "S1":"B11", 
+        "S2":"D6", "S3":"D7", 
+        "S4":"E6", "S5":"E7", 
+        "S6":"D8", "S7":"E8", 
+        "S8":"E10", "S9":"D10", 
+        "S10":"A9", "S11":"A10",
+        "S12":"B10", "S13":"A11"
         }
     ),
 ]