diff --git a/projects/fmcomms1/ac701/system_constr.xdc b/projects/fmcomms1/ac701/system_constr.xdc
index 5edbb533e..4079bdc35 100644
--- a/projects/fmcomms1/ac701/system_constr.xdc
+++ b/projects/fmcomms1/ac701/system_constr.xdc
@@ -156,4 +156,3 @@ set_property DIFF_TERM TRUE [get_ports {adc_data_in_n[13]}]
 
 create_clock -period 2.000 -name dac_clk_in [get_ports dac_clk_in_p]
 create_clock -period 4.000 -name adc_clk_in [get_ports adc_clk_in_p]
-create_clock -period 8.000 -name dac_div_clk [get_pins i_system_wrapper/system_i/axi_ad9122/dac_div_clk]
diff --git a/projects/fmcomms1/kc705/system_constr.xdc b/projects/fmcomms1/kc705/system_constr.xdc
index 85faacfb2..9dd277a55 100644
--- a/projects/fmcomms1/kc705/system_constr.xdc
+++ b/projects/fmcomms1/kc705/system_constr.xdc
@@ -84,5 +84,3 @@ set_property  -dict {PACKAGE_PIN AF23   IOSTANDARD LVDS_25 DIFF_TERM TRUE} [get_
 
 create_clock -name dac_clk_in   -period  2.00  [get_ports dac_clk_in_p]
 create_clock -name adc_clk_in   -period  4.00  [get_ports adc_clk_in_p]
-create_clock -name dac_div_clk  -period  8.00  [get_pins i_system_wrapper/system_i/axi_ad9122/dac_div_clk]
-
diff --git a/projects/fmcomms1/vc707/system_constr.xdc b/projects/fmcomms1/vc707/system_constr.xdc
index 99851c06a..3732602b9 100644
--- a/projects/fmcomms1/vc707/system_constr.xdc
+++ b/projects/fmcomms1/vc707/system_constr.xdc
@@ -84,7 +84,3 @@ set_property  -dict {PACKAGE_PIN AG41   IOSTANDARD LVDS DIFF_TERM TRUE} [get_por
 
 create_clock -name dac_clk_in   -period  2.00  [get_ports dac_clk_in_p]
 create_clock -name adc_clk_in   -period  4.00  [get_ports adc_clk_in_p]
-create_clock -name dac_div_clk  -period  8.00  [get_pins i_system_wrapper/system_i/axi_ad9122/dac_div_clk]
-
-set_false_path -from [get_pins i_system_wrapper/system_i/axi_ad9643_dma/inst/i_request_arb/i_src_dma_fifo/overflow_reg/C] \
-               -to [get_pins i_system_wrapper/system_i/sys_wfifo/wfifo_ctl/inst/m_wovf_m1_reg/D]
diff --git a/projects/fmcomms1/zc702/system_constr.xdc b/projects/fmcomms1/zc702/system_constr.xdc
index b67edd841..3b545e173 100644
--- a/projects/fmcomms1/zc702/system_constr.xdc
+++ b/projects/fmcomms1/zc702/system_constr.xdc
@@ -84,7 +84,3 @@ set_property  -dict {PACKAGE_PIN N20   IOSTANDARD LVDS_25 DIFF_TERM TRUE} [get_p
 
 create_clock -name dac_clk_in   -period  2.16 [get_ports dac_clk_in_p]
 create_clock -name adc_clk_in   -period  4.00 [get_ports adc_clk_in_p]
-create_clock -name dac_div_clk  -period  8.64 [get_pins i_system_wrapper/system_i/axi_ad9122/dac_div_clk]
-
-set_false_path -from [get_pins i_system_wrapper/system_i/axi_ad9643_dma/inst/i_request_arb/i_src_dma_fifo/overflow_reg/C] \
-               -to [get_pins i_system_wrapper/system_i/sys_wfifo/wfifo_ctl/inst/m_wovf_m1_reg/D]
diff --git a/projects/fmcomms1/zc706/system_constr.xdc b/projects/fmcomms1/zc706/system_constr.xdc
index b38b76d60..0a8ac6ef3 100644
--- a/projects/fmcomms1/zc706/system_constr.xdc
+++ b/projects/fmcomms1/zc706/system_constr.xdc
@@ -84,4 +84,3 @@ set_property  -dict {PACKAGE_PIN AG15   IOSTANDARD LVDS_25 DIFF_TERM TRUE} [get_
 
 create_clock -name dac_clk_in   -period  2.00 [get_ports dac_clk_in_p]
 create_clock -name adc_clk_in   -period  4.00 [get_ports adc_clk_in_p]
-create_clock -name dac_div_clk  -period  8.00 [get_pins i_system_wrapper/system_i/axi_ad9122/dac_div_clk]
diff --git a/projects/fmcomms1/zed/system_constr.xdc b/projects/fmcomms1/zed/system_constr.xdc
index 1564f9a09..1687ef1d1 100644
--- a/projects/fmcomms1/zed/system_constr.xdc
+++ b/projects/fmcomms1/zed/system_constr.xdc
@@ -84,7 +84,3 @@ set_property  -dict {PACKAGE_PIN N20   IOSTANDARD LVDS_25 DIFF_TERM TRUE} [get_p
 
 create_clock -name dac_clk_in   -period  2.16 [get_ports dac_clk_in_p]
 create_clock -name adc_clk_in   -period  4.00 [get_ports adc_clk_in_p]
-create_clock -name dac_div_clk  -period  8.64 [get_pins i_system_wrapper/system_i/axi_ad9122/dac_div_clk]
-
-set_false_path -from [get_pins i_system_wrapper/system_i/axi_ad9643_dma/inst/i_request_arb/i_src_dma_fifo/overflow_reg/C] \
-               -to [get_pins i_system_wrapper/system_i/sys_wfifo/wfifo_ctl/inst/m_wovf_m1_reg/D]