diff --git a/projects/pzsdr/ccfmc/system_constr.xdc b/projects/pzsdr/ccfmc/system_constr.xdc
index ac6233513..8ddea307b 100644
--- a/projects/pzsdr/ccfmc/system_constr.xdc
+++ b/projects/pzsdr/ccfmc/system_constr.xdc
@@ -88,6 +88,10 @@ set_property IODELAY_GROUP gmii2rgmii_iodelay_group\
   [get_cells -hier -filter {name =~ *delay_rgmii_rxd*}] \
   [get_cells -hier -filter {name =~ *delay_rgmii_rx_ctl}]
 
+# fan control/sense
+
+set_property  -dict {PACKAGE_PIN  B7    IOSTANDARD LVCMOS18} [get_ports fan_pwm]    ; ## IO_L18P_T2_34
+set_property  -dict {PACKAGE_PIN  A7    IOSTANDARD LVCMOS18} [get_ports fan_tach]   ; ## IO_L18N_T2_34
 
 # unused io (gpio/gt)
 
diff --git a/projects/pzsdr/ccfmc/system_top.v b/projects/pzsdr/ccfmc/system_top.v
index a9a748a02..95a24d9a1 100644
--- a/projects/pzsdr/ccfmc/system_top.v
+++ b/projects/pzsdr/ccfmc/system_top.v
@@ -93,6 +93,9 @@ module system_top (
 
   gpio_bd,
 
+  fan_pwm,
+  fan_tach,
+
   clk_0_p,
   clk_0_n,
   clk_1_p,
@@ -215,6 +218,9 @@ module system_top (
 
   inout   [11:0]  gpio_bd;
 
+  output          fan_pwm;
+  input           fan_tach;
+
   input           clk_0_p;
   input           clk_0_n;
   input           clk_1_p;
@@ -304,6 +310,7 @@ module system_top (
 
   // assignments
 
+  assign fan_pwm = 1'b1;
   assign hdmi_pd = 1'b0;
   assign spi_csn = spi_csn_s[0];
   assign spi_clk = spi_clk_s;