Added more comment to proc_dp_verify_sync().

libraries/base/dp/tb/vhdl/tb_dp_pkg.vhd

@@ -2340,6 +2340,8 @@ PACKAGE BODY tb_dp_pkg IS
   -- PROCEDURE: Verify the DUT output sync
   -- . sync is defined such that it can only be active at sop
   -- . assume that the fractional sync period varies between N and N-1 blocks
+  -- . the fractional sync period starts with N blocks and fits e.g.
+  --   dp_bsn_source_v2, dp_bsn_sync_scheduler.
   ------------------------------------------------------------------------------
   PROCEDURE proc_dp_verify_sync(CONSTANT c_start_bsn      : IN    NATURAL;    -- BSN of first sync, start of fractional periods
                                 CONSTANT c_sync_period    : IN    NATURAL;    -- number of sample per sync period