diff --git a/src/gateware/cxp_downconn.py b/src/gateware/cxp_downconn.py
index bf8518a..c985feb 100644
--- a/src/gateware/cxp_downconn.py
+++ b/src/gateware/cxp_downconn.py
@@ -30,8 +30,10 @@ class CXP_DownConn(Module, AutoCSR):
 
         self.submodules.qpll = qpll = QPLL(refclk, sys_clk_freq)
 
+        # TODO: add gtx slave channel
+
         # single & master tx_mode can lock with rx in loopback 
-        self.submodules.gtx = gtx = GTX(self.qpll, pads, sys_clk_freq, tx_mode="single", rx_mode="single")
+        self.submodules.gtx = gtx = GTX(self.qpll, pads[0], sys_clk_freq, tx_mode="single", rx_mode="single")
         
         # NOTE: No need to connect cxp_gtx_tx, we don't use tx anyway (just for loopback)