Register cnt_en to avoid combinational loop.

libraries/base/dp/src/vhdl/dp_strobe_total_count.vhd

@@ -113,15 +113,15 @@ ARCHITECTURE rtl OF dp_strobe_total_count IS
   TYPE t_cnt_arr IS ARRAY (INTEGER RANGE <>) OF STD_LOGIC_VECTOR(g_count_w-1 DOWNTO 0);
 
   -- Registers in dp_clk domain
-  SIGNAL ref_sync_reg      : STD_LOGIC := '0';
-  SIGNAL in_strobe_reg_arr : STD_LOGIC_VECTOR(g_nof_counts-1 DOWNTO 0) := (OTHERS=>'0');
-  SIGNAL rd_reg            : STD_LOGIC_VECTOR(c_mm_reg.nof_dat*c_mm_reg.dat_w-1 DOWNTO 0) := (OTHERS=>'0');
-  SIGNAL mm_cnt_clr        : STD_LOGIC;
-  SIGNAL cnt_clr           : STD_LOGIC;
-  SIGNAL cnt_en            : STD_LOGIC := '0';
-  SIGNAL cnt_en_arr        : STD_LOGIC_VECTOR(g_nof_counts-1 DOWNTO 0);
-  SIGNAL cnt_arr           : t_cnt_arr(g_nof_counts-1 DOWNTO 0);
-  SIGNAL hold_cnt_arr      : t_cnt_arr(g_nof_counts-1 DOWNTO 0) := (OTHERS=>(OTHERS=>'0'));
+  SIGNAL ref_sync_reg       : STD_LOGIC := '0';
+  SIGNAL in_strobe_reg_arr  : STD_LOGIC_VECTOR(g_nof_counts-1 DOWNTO 0) := (OTHERS=>'0');
+  SIGNAL rd_reg             : STD_LOGIC_VECTOR(c_mm_reg.nof_dat*c_mm_reg.dat_w-1 DOWNTO 0) := (OTHERS=>'0');
+  SIGNAL mm_cnt_clr         : STD_LOGIC;
+  SIGNAL cnt_clr            : STD_LOGIC;
+  SIGNAL cnt_en             : STD_LOGIC := '0';
+  SIGNAL cnt_en_arr         : STD_LOGIC_VECTOR(g_nof_counts-1 DOWNTO 0);
+  SIGNAL cnt_arr            : t_cnt_arr(g_nof_counts-1 DOWNTO 0);
+  SIGNAL hold_cnt_arr       : t_cnt_arr(g_nof_counts-1 DOWNTO 0) := (OTHERS=>(OTHERS=>'0'));
   
 BEGIN
  
@@ -149,7 +149,18 @@ BEGIN
   -- . clear strobe counters immediately at cnt_clr
   -- . start strobe counters after ref_sync, e.g. to align strobe counters in different nodes in
   --   case the input was (already) active during the cnt_clr
-  cnt_en <= '0' WHEN cnt_clr = '1' ELSE '1' WHEN ref_sync_reg = '1' ELSE cnt_en;
+  p_cnt_en : PROCESS(dp_rst, dp_clk)
+  BEGIN
+    IF dp_rst = '1' THEN
+      cnt_en <= '0';
+    ELSIF rising_edge(dp_clk) THEN
+      IF cnt_clr = '1' THEN
+        cnt_en <= '0';
+      ELSIF ref_sync = '1' THEN  -- use ref_sync have cnt_en aligned with ref_sync_reg
+        cnt_en <= '1';
+      END IF;
+    END IF;
+  END PROCESS;
 
   -- strobe counters
   gen_counters : FOR I IN 0 TO g_nof_counts-1 GENERATE