Report that g_nof_blocks >= 2. Disable output in case of re-enable, to ensure...

Report that g_nof_blocks >= 2. Disable output in case of re-enable, to ensure re-start with nof_blk_max sync in first out_sync interval.

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

@@ -102,7 +102,7 @@ USE work.dp_stream_pkg.ALL;
 ENTITY dp_bsn_sync_scheduler IS
   GENERIC (
     g_bsn_w           : NATURAL := c_dp_stream_bsn_w;
-    g_block_size      : NATURAL := 256;  -- = number of data valid per BSN block
+    g_block_size      : NATURAL := 256;  -- = number of data valid per BSN block, must be >= 2
     g_pipeline        : NATURAL := 1     -- use '1' on HW, use '0' for easier debugging in Wave window
   );
   PORT (
@@ -140,8 +140,8 @@ ARCHITECTURE rtl OF dp_bsn_sync_scheduler IS
     nof_blk_min       : NATURAL;
     nof_blk_max       : NATURAL;
     nof_blk           : NATURAL;
-    extra             : INTEGER;-- RANGE -g_block_size TO g_block_size;
-    accumulate        : INTEGER;-- RANGE -g_block_size TO g_block_size;
+    extra             : NATURAL RANGE 0 TO g_block_size;
+    accumulate        : NATURAL RANGE 0 TO g_block_size*2;
     hold_eop          : STD_LOGIC;
     update_bsn        : STD_LOGIC;
     output_enable     : STD_LOGIC;
@@ -160,6 +160,8 @@ ARCHITECTURE rtl OF dp_bsn_sync_scheduler IS
 
 BEGIN
 
+  ASSERT g_block_size >= 2 REPORT "g_block_size must be >= 2." SEVERITY FAILURE;
+
   -- Capture monitoring info
   mon_input_current_bsn <= in_sosi.bsn(g_bsn_w-1 DOWNTO 0) WHEN rising_edge(clk) AND in_sosi.sop = '1';
   mon_input_bsn_at_sync <= in_sosi.bsn(g_bsn_w-1 DOWNTO 0) WHEN rising_edge(clk) AND in_sosi.sync = '1';
@@ -225,11 +227,20 @@ BEGIN
       v.blk_cnt := 0;
     END IF;
 
-    -- If ctrl_enable is still active after initialization then continue with enable
+    -- Enable / disable control
     IF ctrl_enable = '0' THEN
-      v.enable := '0';
+      v.enable := '0';  -- disable when ctrl_enable requests disable
+    ELSIF ctrl_enable_evt = '1' THEN
+      v.enable := '0';  -- disable when ctrl_enable requests re-enable
     ELSIF r.enable_init = '0' THEN
-      v.enable := '1';
+      IF r.hold_eop = '1' THEN
+        -- enable after in_sosi.eop, so that r.enable has caused
+        -- v.output_enable = '0', to ensure that a re-enable starts
+        -- with the nof_blk_max sync interval. Otherwise
+        -- v.output_enable = '1' can cause that re-enable can restart
+        -- with the nof_blk_min sync interval
+        v.enable := '1';
+      END IF;
     END IF;
 
     -- Hold input eop to detect when input has finished a block and to detect