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.