diff --git a/src/gateware/zc706.py b/src/gateware/zc706.py
index 00a9755..d91c7d7 100755
--- a/src/gateware/zc706.py
+++ b/src/gateware/zc706.py
@@ -690,7 +690,8 @@ class CXP_FMC():
 
         self.submodules.cxp = cxp.CXP(
             refclk=self.cdr_clk,
-            pads=gtx_pads,
+            downconn_pads=gtx_pads,
+            upconn_pads=platform.request("CXP_LS", 0),
             sys_clk_freq=clk_freq,
             debug_sma=platform.request("user_sma_clock_33"),
             pmod_pads = pmod_pads