Relationship between SRC-Q and STAS-Q

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

As shown in This Figure, packet-0 spans across three SRC-Q elements; the third element indicates EOP=1 with UserHandle=2. On EOP, DMA updates STAS-Q with UserHandle = 2, which corresponds to the handle value in the SRC-Q element with EOP = 1. Similarly, packet-1 spans two elements and in STAS-Q the updated handle value corresponds to EOP = 1 element. This UserHandle mechanism allows software to associate number of SRC-Q elements corresponding to a STAS-Q update.

Figure 30-9:      UserHandle Usage

X-Ref Target - Figure 30-9