Merge branch 'L2SDP-136' into 'master'

Added support for a fractional amount of blocks per sync period.

Closes L2SDP-136

See merge request desp/hdl!36

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

@@ -30,10 +30,10 @@
 --   When enabled (enable='1') then a block of g_nof_data_per_block words is
 --   output via src_out_arr under flow control by the input valid.
 --
---   The input sync, sop and eop are ignored. For the output the sync, sop and 
+--   The input sop and eop are ignored. For the output the sync, sop and 
 --   eop are generated by counting the input valid and using
 --   g_nof_data_per_block for the output sop and eop, and using
---   g_nof_blk_per_sync for the output sync.
+--   g_nof_blk_per_sync and the input sync for the output sync.
 --
 --   The first active input valid starts the dp_block_gen_valid_arr. The first
 --   output block will have an output sync and every g_nof_blk_per_sync there
@@ -136,6 +136,9 @@
 -- . Using g_check_input_sync=True is similar to using a dp_sync_checker in
 --   front of this dp_block_gen_valid_arr. However the advantage of
 --   dp_sync_checker is that it provides monitoring and control via MM.
+-- . If snk_in.sync is always '0', sync out is generated at g_nof_blk_per_sync.
+--   Otherwise, the output sync is also derived from snk_in.sync to allow for
+--   a fractional amount of blocks per sync period.
 
 LIBRARY IEEE, common_lib;
 USE IEEE.STD_LOGIC_1164.ALL;
@@ -147,7 +150,7 @@ ENTITY dp_block_gen_valid_arr IS
   GENERIC (
     g_nof_streams           : POSITIVE := 1;
     g_nof_data_per_block    : POSITIVE := 1;
-    g_nof_blk_per_sync      : POSITIVE := 8;
+    g_nof_blk_per_sync      : POSITIVE := 8; -- Maximum nof blocks per sync period, e.g 7.3 becomes 8.
     g_check_input_sync      : BOOLEAN := FALSE;
     g_nof_pages_bsn         : NATURAL := 0;
     g_restore_global_bsn    : BOOLEAN := FALSE
@@ -271,12 +274,14 @@ BEGIN
             -- maintain blk_cnt for output sync interval, the blk_cnt is the local bsn that wraps at every sync
             IF r.blk_cnt>=g_nof_blk_per_sync-1 THEN
               nxt_r.blk_cnt <= 0;
+            ELSIF snk_in.sync = '1' THEN 
+              nxt_r.blk_cnt <= 1;
             ELSE
               nxt_r.blk_cnt <= r.blk_cnt+1;
             END IF;
 
             -- create local sync and pass on input bsn at local sync
-            IF r.blk_cnt=0 THEN                        -- output sync starts at first input valid
+            IF r.blk_cnt=0 OR snk_in.sync = '1' THEN    -- output sync starts at first input valid
               nxt_r.reg_sosi.sync <= '1';               -- output sync for this block
               nxt_r.reg_sosi.bsn  <= in_sosi.bsn;       -- output input bsn at sync
             ELSE