WR-Streamers-Principle-of-Operation.md

 ## Streamers principles of data transfer
 
   - **Tx Streamer** transfers **data words** that are of width (n \* 16)
-    bits. The width is defined by generic `data_width` (in
-    `g_tx_streamer_params` and `g_rx_streamer_params`) that must be
-    identical for the Tx and Rx Streamer.
+    bits where the upper limit of the word size is the size of Ethernet
+    frame payload (minus overhead for WR Streamers header/CRC) . The
+    width is defined by generic `data_width` (in `g_tx_streamer_params`
+    and `g_rx_streamer_params`) that must be identical for the Tx
+    Streamer of the sending node and Rx Streamer of the receiving node
+    (i.e. the the parameters can be different on the same node). For
+    example, the **data word** width in the
+    [BTrain-over-WhiteRabbit](https://gitlab.cern.ch/BTrain-TEAM/Btrain-over-WhiteRabbit/wikis/home)
+    project is **208 bits** while the data width in the
+    [streamers-on-spec\_trigger-distribution](https://www.ohwr.org/project/wr-cores/wikis/wr-streamers-simulation)
+    example is **80 buts**.
   - **Data words** can be grouped in **blocks** of any size with upper
     limit defined by `max_words_per_frame` (in `g_tx_streamer_params`) ,
     each **block** has independent sequence number and CRC.