SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
When PCIe subsystem is operating as an End Point (EP), either the legacy interrupts, MSI or MSI-X interrupts can be triggered to the upstream ports (eventually leading to an interrupt in RP device). As per PCIe Specifications, each PCIe function may generate only one of the Legacy or MSI interrupt types as decided during configuration period.