AXI4 Stream中position byte是什么意思？

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    如题，在Stream中分为2种数据，一种是postionbyte，一种是Databyte:AbyteofdatathatcontAInsvaliPositionbyte:Abytethatindicatesthere



如题，在Stream中分为2種数據，一種是postion byte，一种是data byte，data byte容易理解，就是要傳輸的数据。可是position byte是什么呢？里面包含的是什么內容？用于做什么的？如果能舉個小例子就更好了，请教高手解答，不勝感謝。

下面是摘自文档中的部分：
Data byte: A byte of data that contAIns valid information that is transmitted between the source and destination.
Position byte: A byte that indicates the relative positions of data bytes within the stream. This is a placeholder that does not contain any relevant data values that are transmitted between the source and destination.