| Port Name | I/O | Description |
|---|---|---|
| usr_irq_in_vld | I | Valid An assertion indicates that an interrupt associated with the vector, function, and pending fields on the bus should be generated to PCIe. Once asserted, Usr_irq_in_vld must remain high until usr_irq_out_ack is asserted by the DMA. |
| usr_irq_in_vec [11:0] | I | Vector The MSIX vector to be sent. Vector number is the index for MSI_X table. Vector 0 is the first vector for that function. Each function has 8 vectors. |
| usr_irq_in_fnc [7:0] | I | Function The function of the vector to be sent. |
| usr_irq_out_ack | O | Interrupt Acknowledge An assertion of the acknowledge bit indicates that the interrupt was transmitted on the link the user logic must wait for this pulse before signaling another interrupt condition. |
| usr_irq_out_fail | O | Interrupt Fail An assertion of fail indicates that the interrupt request is aborted before transmission on the link. The interrupt fail can happen for several reasons, for details, see the following MSIX Interrupt Options section. |
Note: Maximum eight vectors are allowed per function.