The interface signals for the Bridge are described in the following table.
|usr_irq_req[NUM_USR_IRQ-1:0]||I||Assert to generate an interrupt. Maintain assertion until interrupt is serviced.|
|usr_irq_ack[NUM_USR_IRQ-1:0]||O||Indicates that the interrupt has been sent on PCIe. Two acks are generated for legacy interrupts. One ack is generated for MSI interrupts.|
|msi_enable||O||Indicates when MSI is enabled.|
|msix_enable||O||Indicates when MSI-X is enabled.|