QDMA Subsystem for PCI Express


Product Description

The AMD LogiCORE™ QDMA for PCI Express® (PCIe) implements a high performance, configurable Scatter Gather DMA for use with the PCI Express Integrated Block.  The IP provides an optional AXI4-MM or AXI4-Stream user interface.

The QDMA solution provides support for multiple Physical/ Virtual Functions with scalable queues, and is ideal for applications that require small packet performance at low latency.


Reference drivers are available at https://github.com/Xilinx/dma_ip_drivers

Key Features and Benefits

Supports Integrated Blocks for PCIe in UltraScale+™ devices, including Virtex™ UltraScale+™ devices with HBM

  • Supports 64, 128, 256 and 512-bit data path
  • Supports x1, x2, x4, x8, or x16 link widths.
  • Supports Gen1, Gen2, and Gen3 link speeds
  • Support for both the AXI4-Memory Mapped and AXI4-Stream interfaces per queue
  • 2K queue sets
    • 2K H2C Descriptor rings
    • 2K C2H Descriptor rings
    • 2K C2H Write back rings
  • Supports Polling Mode (Status Descriptor Write Back)
  • C2H Stream interrupt moderation
  • C2H stream CMPT entry coalesce
  • Descriptor and DMA Customization through user logic
    • Allow Custom Descriptor format
    • Traffic Management
  • Supports SR-IOV up to 4 Physical Functions and 252 Virtual Functions
    • Thin Hypervisor model
    • Allows only privileged/Physical function (PF) to program contexts and registers
    • Function Level Reset support
    • Mailbox
  • Interrupts
    • 2K MSI-X vectors
    • Up to 8 MSI-X per function
    • Interrupt coalescing

Resource Utilization



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