Adding bit counters for rx and tx. Since they will be updated the same we should have a single counter though. Created rx shift register.

1 files changed, 16 insertions, 8 deletions

diff --git a/src/rtl/fpga_mkm.v b/src/rtl/fpga_mkm.v
index 6dee64a..eb6172d 100644
--- a/src/rtl/fpga_mkm.v
+++ b/src/rtl/fpga_mkm.v
@@ -102,18 +102,26 @@ module fpga_mkm(
   //----------------------------------------------------------------
   // reg_update
   //----------------------------------------------------------------
-  always @ (posedge clk)
+  always @ (posedge clk or negedge tamper)
     begin : reg_update
-      alarm_counter_reg <= alarm_counter_reg + 1;
+      if (!tamper)
+        begin
+          // Zeroise the key material!
 
-      if (alarm_we)
-        alarm_reg <= alarm_new;
+        end
+      else
+        begin
+          alarm_counter_reg <= alarm_counter_reg + 1;
 
-      if (key_loaded_we)
-        key_loaded_reg <= key_loaded_new;
+          if (alarm_we)
+            alarm_reg <= alarm_new;
 
-      if (fpga_mkm_ctrl_we)
-        fpga_mkm_ctrl_reg <= fpga_mkm_ctrl_new;
+          if (key_loaded_we)
+            key_loaded_reg <= key_loaded_new;
+
+          if (fpga_mkm_ctrl_we)
+            fpga_mkm_ctrl_reg <= fpga_mkm_ctrl_new;
+        end
     end