3.1.7. User MSI-X
User MSI-X is arbitrated along with the H2D/D2H MSI-X/Writeback requests, and is handled exactly the same way as the others post the arbitration. The high-level diagram for the MSI-X handling mechanism is shown below.
- 2’b00: H2D DMA Vector
- 2’b01: H2D Event Interrupt
- 2’b10: D2H DMA Vector
- 2’b11: D2H Event Interrupt
2’b00 and 2’b10 to address the Descriptor completion related interrupts (DMA operation MSI-X) on both the paths.
2’b01 and 2’b11 are used for user MSI-X.