diff --git a/firmware/cpld/sgpio_if/top.ucf b/firmware/cpld/sgpio_if/top.ucf
index f3b7b65b..f4421b3f 100755
--- a/firmware/cpld/sgpio_if/top.ucf
+++ b/firmware/cpld/sgpio_if/top.ucf
@@ -96,6 +96,7 @@ INST "DA<4>" TNM=adc_data;
 INST "DA<5>" TNM=adc_data;
 INST "DA<6>" TNM=adc_data;
 INST "DA<7>" TNM=adc_data;
+INST "CODEC_CLK" TNM=adc_data;
 
 TIMESPEC "TS_adc_data" = FROM "adc_data" TO "CODEC_X2_CLK" 16 ns;