https://docs.amd.com/r/en-US/pg344-pcie-dma-versal/IRQ-Block-User-Vector-Number-0x8C?contentId=DrgD0Gis9vj8JVS1yN3O4w
IRQ Block User Vector Number (0x8C) - IRQ Block User Vector Number (0x8C) - 2.0 English - PG344
If MSI is enabled, this register specifies the MSI or MSI-X vector number of the MSI. In legacy interrupts only the 2 LSB of each field should be used to map...
block userirqvectornumberenglish