V-Series Avalon-MM DMA Interface for PCIe Solutions User Guide

ID 683514
Date 7/31/2018
Public
Document Table of Contents

1.2. Features

New features in the Quartus® Prime 16.1 software release:

  • Increased maximum DMA transfer size for the 128- and 256-bit interfaces to 1 megabyte (MB).

The V-Series Avalon-MM DMA for PCI Express supports the following features:

  • Complete protocol stack including the Transaction, Data Link, and Physical Layers implemented as hard IP.
  • Native support for Gen1 x8, Gen2 x4, Gen2 x8, Gen3 x2, Gen3 x4, Gen3 x8 for Endpoints. The variant downtrains when plugged into a lesser link width or changes to a different maximum link rate.
  • Dedicated 16 kilobyte (KB) receive buffer.
  • Optional hard reset controller for Gen2.
  • Support for 128- or 256-bit Avalon-MM interface to Application Layer with embedded DMA up to Gen3 ×8 data rate.
  • Support for 32- or 64-bit addressing for the Avalon-MM interface to the Application Layer.
  • Platform Designer design example demonstrating parameterization, design modules, and connectivity.
  • Extended credit allocation settings to better optimize the RX buffer space based on application type.
  • Optional end-to-end cyclic redundancy code (ECRC) generation and checking and advanced error reporting (AER) for high reliability applications.
  • Support for Configuration Space Bypass Mode (in Arria® V GZ and Stratix® V), allowing you to design a custom Configuration Space and support multiple functions.
  • Support for Gen3 PIPE simulation.
  • Easy to use:
    • Flexible configuration.
    • No license requirement.
    • Design examples to get started.
Table 2.   Feature Comparison for 128- and 256-Bit Avalon-MM with DMA Interface to the Application Layer
Feature 128-Bit Interface 256-Bit Interface
Gen1 x8 Not supported
Gen2 x4, x8 x8
Gen3 x4 x4, x8
Root Port Not supported Supported
Tags supported 16 16 or 256
Maximum descriptor size 1 MB 1 MB
Maximum payload size 128 or 256 128 or 256
Immediate write1 Not supported Supported
1 The Immediate Write provides a fast mechanism to send a Write TLP upstream. The descriptor stores the 32-bit payload, replacing the Source Low Address field of the descriptor.

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