-Reduced FIFO depth for input BSN aligners:

 .was 130k, now 12k.

applications/arts/designs/arts_unb2b_sc3/src/vhdl/arts_unb2b_sc3_input.vhd

@@ -174,13 +174,14 @@ ARCHITECTURE str OF arts_unb2b_sc3_input IS
 
   -------------------------------------------------------------------------------                  
   -- BSN Aligner + FIFOs 
+  -- . Set as small as possible (1 block) as each set of 3 fibers will be almost aligned.
   -------------------------------------------------------------------------------
-  CONSTANT c_block_size               : NATURAL := 176;
-  CONSTANT c_block_period             : NATURAL := c_block_size + 10; -- FIXME Based on....?
-  CONSTANT c_bsn_align_latency        : NATURAL := 3;
-  CONSTANT c_bsn_align_sop_timeout    : NATURAL := (c_bsn_align_latency + 1) * c_block_period;  -- wait somewhat more than c_bsn_align_latency periods
+  CONSTANT c_block_size               : NATURAL := 96; --96 6b4 words carrying 128 48b words
+  CONSTANT c_block_period             : NATURAL := 137; -- 140.625MSps/200MSps = 96/137
+  CONSTANT c_bsn_align_latency        : NATURAL := 1;
+  CONSTANT c_bsn_align_sop_timeout    : NATURAL := (c_bsn_align_latency + 0) * c_block_period;  -- This is a tight timeout.
   CONSTANT c_bsn_align_xoff_timeout   : NATURAL :=  c_bsn_align_latency * 2  * c_block_period;  -- flush factor 2 longer than needed
-  CONSTANT c_dp_fifo_size             : NATURAL := (c_bsn_align_latency + 5) * c_block_size;    -- be able to fit blocks for as long as sop time out;
+  CONSTANT c_dp_fifo_size             : NATURAL := (c_bsn_align_latency + 0) * c_block_size;    -- be able to fit blocks for as long as sop time out;
   CONSTANT c_dp_fifo_fill             : NATURAL := c_block_size;
 
   SIGNAL dp_fifo_fill_src_out_arr     : t_dp_sosi_arr(c_nof_10GbE_streams-1 DOWNTO 0);