added comment

applications/lofar2/libraries/sdp/src/vhdl/sdp_statistics_offload.vhd

@@ -249,6 +249,7 @@ BEGIN
       -- Use done to start next packets
       IF r.block_count < c_nof_packets-1  THEN
         IF g_statistics_type /= "XST" OR r.crosslet_count < r.nof_crosslets-1 THEN
+          -- For SST, BST and for XST nof_crosslets do:
           IF r.block_count MOD c_nof_data_per_step = 0 THEN
             v.start_address := r.block_count / c_nof_data_per_step * c_block_size;  -- jump to first packet in next block
           ELSE 
@@ -258,6 +259,7 @@ BEGIN
           v.block_count    := r.block_count + 1;
           v.crosslet_count := r.crosslet_count + 1;
         ELSE
+          -- For XST after nof_crosslets do:
           v.crosslet_count := 0;
           -- skip block indices for unused XST blocks in this P_sq iteration by setting the block count to the next multiple of N_crosslets_max i.e. 7, 14, 21, etc.
           v.block_count    := r.block_count + 1 + (c_sdp_N_crosslets_max - r.nof_crosslets);