Improved the blockdiagram by adding the generics and dp components.

libraries/base/diag/src/vhdl/mms_diag_block_gen.vhd

@@ -52,23 +52,32 @@
 --   on the tx_seq see mms_diag_tx_seq.
 --
 -- Block diagram:
---     . g_use_usr_input
+--
+--      g_use_usr_input
 --       .    g_use_bg
---     . g_use_tx_seq
---                           __ dp_mux
---                          |  \
---      usr --------------->|0  \
---                          |    \
---                          |     |----------------------> out
---                          |    /    |             ^
---             BG ctrl ---->|1  /     |             |
+--       .    g_use_bg_buffer_ram
+--       .     .                               g_use_tx_seq
+--       .     .        g_usr_bypass_xonoff     .
+--       .     .         .                      .............
+--       .     .         .                      .           .
+--       .     .         ___     __ dp_mux      .           .
+--       .     .        |dp |   |  \            .           ____
+--      usr ------------|xon|-->|0  \           .          |dp  |
+--             .        |off|   |    \          .          |pipe|
+--             .        |___|   |     |--------------------|line|---> out
+--             .                |    /    |     .       ^  |arr |
+--            BG ctrl --------->|1  /     |     .       |  |____|
 --            BG data           |__/      \--> tx_seq --/
 --               ||                              |
 --               ||                              |
---       MM ==============================================
+--       MM =================================================
 --    
 --   The dp_mux is only there if both the usr input and the BG are used.
 --
+--   The dp_pipeline_arr is only there when g_use_tx_seq=TRUE. It registers
+--   the selection between dp_mux output data and tx_seq data, to ease timing
+--   closure.
+--
 -- Remark:
 -- . The diag_block_gen does not support back pressure, but it does support
 --   XON/XOFF flow control at block level via out_siso.xon.