diff --git a/projects/ad9434_fmc/common/ad9434_bd.tcl b/projects/ad9434_fmc/common/ad9434_bd.tcl
index 16d556dc0..5a04e9817 100644
--- a/projects/ad9434_fmc/common/ad9434_bd.tcl
+++ b/projects/ad9434_fmc/common/ad9434_bd.tcl
@@ -9,13 +9,14 @@ set adc_or_n    [create_bd_port -dir I adc_or_n]
 
 # spi interface
 
-set spi_clk_i   [create_bd_port -dir I spi_clk_i]
-set spi_clk_o   [create_bd_port -dir O spi_clk_o]
-set spi_csn_i   [create_bd_port -dir I spi_csn_i]
-set spi_csn_o   [create_bd_port -dir O spi_csn_o]
-set spi_mosi_i  [create_bd_port -dir I spi_mosi_i]
-set spi_mosi_o  [create_bd_port -dir O spi_mosi_o]
-set spi_miso_i  [create_bd_port -dir I spi_miso_i]
+set spi_clk_i       [create_bd_port -dir I spi_clk_i]
+set spi_clk_o       [create_bd_port -dir O spi_clk_o]
+set spi_csn_i       [create_bd_port -dir I spi_csn_i]
+set spi_csn_adc_o   [create_bd_port -dir O spi_csn_adc_o]
+set spi_csn_clk_o   [create_bd_port -dir O spi_csn_clk_o]
+set spi_mosi_i      [create_bd_port -dir I spi_mosi_i]
+set spi_mosi_o      [create_bd_port -dir O spi_mosi_o]
+set spi_miso_i      [create_bd_port -dir I spi_miso_i]
 
 # ad9434
 
@@ -54,13 +55,14 @@ set_property -dict [list CONFIG.PCW_SPI0_SPI0_IO {EMIO}] $sys_ps7
 
 # spi connections
 
-connect_bd_net -net spi_csn_i   [get_bd_ports spi_csn_i]  [get_bd_pins sys_ps7/SPI0_SS_I]
-connect_bd_net -net spi_csn_o   [get_bd_ports spi_csn_o]  [get_bd_pins sys_ps7/SPI0_SS_O]
-connect_bd_net -net spi_clk_i   [get_bd_ports spi_clk_i]  [get_bd_pins sys_ps7/SPI0_SCLK_I]
-connect_bd_net -net spi_clk_o   [get_bd_ports spi_clk_o]  [get_bd_pins sys_ps7/SPI0_SCLK_0]
-connect_bd_net -net spi_mosi_i  [get_bd_ports spi_mosi_i] [get_bd_pins sys_ps7/SPI0_MOSI_I]
-connect_bd_net -net spi_mosi_o  [get_bd_ports spi_mosi_o] [get_bd_pins sys_ps7/SPI0_MOSI_O]
-connect_bd_net -net spi_miso_i  [get_bd_ports spi_miso_i] [get_bd_pins sys_ps7/SPI0_MISO_I]
+connect_bd_net -net spi_csn_i       [get_bd_ports spi_csn_i]      [get_bd_pins sys_ps7/SPI0_SS_I]
+connect_bd_net -net spi_csn_adc_o   [get_bd_ports spi_csn_adc_o]  [get_bd_pins sys_ps7/SPI0_SS_O]
+connect_bd_net -net spi_csn_clk_o   [get_bd_ports spi_csn_clk_o]  [get_bd_pins sys_ps7/SPI0_SS1_O]
+connect_bd_net -net spi_clk_i       [get_bd_ports spi_clk_i]      [get_bd_pins sys_ps7/SPI0_SCLK_I]
+connect_bd_net -net spi_clk_o       [get_bd_ports spi_clk_o]      [get_bd_pins sys_ps7/SPI0_SCLK_O]
+connect_bd_net -net spi_mosi_i      [get_bd_ports spi_mosi_i]     [get_bd_pins sys_ps7/SPI0_MOSI_I]
+connect_bd_net -net spi_mosi_o      [get_bd_ports spi_mosi_o]     [get_bd_pins sys_ps7/SPI0_MOSI_O]
+connect_bd_net -net spi_miso_i      [get_bd_ports spi_miso_i]     [get_bd_pins sys_ps7/SPI0_MISO_I]
 
 # ad9434 connections
 
diff --git a/projects/ad9434_fmc/zc706/system_constr.xdc b/projects/ad9434_fmc/zc706/system_constr.xdc
index 11a8ede8a..99da754ab 100644
--- a/projects/ad9434_fmc/zc706/system_constr.xdc
+++ b/projects/ad9434_fmc/zc706/system_constr.xdc
@@ -33,10 +33,10 @@ set_property  -dict {PACKAGE_PIN  AC12  IOSTANDARD LVDS_25 DIFF_TERM TRUE} [get_
 
 # spi
 
-set_property  -dict {PACKAGE_PIN  Y30   IOSTANDARD LVDS_25}                 [get_ports spi_csn_clk]     ; ## G36  FMC_LPC_LA33_P
-set_property  -dict {PACKAGE_PIN  AA30  IOSTANDARD LVDS_25}                 [get_ports spi_csn_adc]     ; ## G37  FMC_LPC_LA33_N
-set_property  -dict {PACKAGE_PIN  Y27   IOSTANDARD LVDS_25}                 [get_ports spi_sclk]        ; ## H38  FMC_LPC_LA32_N
-set_property  -dict {PACKAGE_PIN  Y26   IOSTANDARD LVDS_25}                 [get_ports spi_dio]         ; ## H37  FMC_LPC_LA32_P
+set_property  -dict {PACKAGE_PIN  Y30   IOSTANDARD LVCMOS25}               [get_ports spi_csn_clk]      ; ## G36  FMC_LPC_LA33_P
+set_property  -dict {PACKAGE_PIN  AA30  IOSTANDARD LVCMOS25}               [get_ports spi_csn_adc]      ; ## G37  FMC_LPC_LA33_N
+set_property  -dict {PACKAGE_PIN  Y27   IOSTANDARD LVCMOS25}               [get_ports spi_sclk]         ; ## H38  FMC_LPC_LA32_N
+set_property  -dict {PACKAGE_PIN  Y26   IOSTANDARD LVCMOS25}               [get_ports spi_dio]          ; ## H37  FMC_LPC_LA32_P
 
 # clocks
 
diff --git a/projects/ad9434_fmc/zc706/system_top.v b/projects/ad9434_fmc/zc706/system_top.v
index 9ea84b145..f86f78748 100644
--- a/projects/ad9434_fmc/zc706/system_top.v
+++ b/projects/ad9434_fmc/zc706/system_top.v
@@ -142,10 +142,12 @@ module system_top (
   wire    [31:0]  gpio_i;
   wire    [31:0]  gpio_o;
   wire    [31:0]  gpio_t;
-  wire    [ 1:0]  spi_csn;
   wire            spi_miso;
   wire            spi_mosi;
 
+  wire            spi_csn_adc;
+  wire            spi_csn_clk;
+
   // instantiations
 
   genvar n;
@@ -159,11 +161,8 @@ module system_top (
   end
   endgenerate
 
-  assign spi_csn_adc = spi_csn[0];
-  assign spi_csn_clk = spi_csn[1];
-
   ad9434_spi i_spi (
-    .spi_csn(spi_csn),
+    .spi_csn({spi_csn_clk, spi_csn_adc}),
     .spi_clk(spi_sclk),
     .spi_mosi(spi_mosi),
     .spi_miso(spi_miso),
@@ -212,10 +211,11 @@ module system_top (
     .spi_clk_i(1'b0),
     .spi_clk_o(spi_sclk),
     .spi_csn_i(1'b1),
-    .spi_csn_o(spi_csn),
-    .spi_mosi_i(spi_miso),
-    .spi_mosi_o(1'b0),
-    .spi_miso_i(spi_mosi));
+    .spi_csn_adc_o(spi_csn_adc),
+    .spi_csn_clk_o(spi_csn_clk),
+    .spi_mosi_i(spi_mosi),
+    .spi_mosi_o(spi_mosi),
+    .spi_miso_i(spi_miso));
 
 endmodule