The Root Port Interrupt FIFO Read Register 2 reads from this location return message payload for MSI Interrupts. The header information is presented in the Root Port Interrupt FIFO Read 1 register. The interrupt-handling flow is to read the Root Port Interrupt FIFO Read 1 register first, immediately followed by this register. For non-Root Port cores, reads return 0. For INTx interrupts, reads return zero.
Reads are non-destructive. Removing the message from the FIFO requires a write to either this register or the Root Port Interrupt FIFO Read 1 register (write value is ignored).
|Bits||Name||Core Access||Reset Value||Description|
|15:0||Message Data||RWC||0||Payload for MSI messages.|