Multi Channel DMA Intel® FPGA IP for PCI Express* User Guide

ID 683821
Date 10/06/2023
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4.4.6. User Event MSI-X Interface

User logic requests DMA engine to send an event interrupt for a queue associated with a PF/VF.

Table 42.  User MSI-X Interface

Interface Clock Domain for H-Tile: coreclkout_hip

Interface Clock Domain for P-Tile, F-Tile and R-Tile: app_clk

Signal Name I/O Description
usr_event_msix_valid_i

Input

The valid signal qualifies valid data on any cycle with data transfer.

usr_event_msix_ready_o

Output

On interfaces supporting backpressure, the sink asserts ready to mark the cycles where transfers may take place.

usr_event_msix_data_i [15:0] Input

{rsvd[3:0],msix_queue_dir,msix_queue_num_i[10:0]}

Note: msix_queue_dir Queue direction. D2H = 0, H2D =1