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AR# 43805

AXI Bridge for PCI Express - Mastering on the AXI-lite interconnect with a 64-bit AXI data width interface causes DECERR

Description

Version Found: 1.00.a
Version Resolved and other Known Issues: See (Xilinx Answer 44969)

The Virtex-6 AXI EP Bridge for PCI Express must use the 64-bit AXI data width. When mastering on an AXI-lite interconnect with a 64-bit AXI data width, the bridge sets the burst size to 8-bytes instead of 4-bytes when there isan incoming 1 d-word memory read or write request. This causes the an error as indicated in (Xilinx Answer 43491).

NOTE:The "Version Found" columnlists the version that the problem was firstdiscovered. The problem might also exist in earlier versions, but no specific testing has been performedto verify earlier versions.

Solution

The AXI EP Bridge v1.00a for PCI Express has a known issue when mastering onto a 32-bit AXI interconnect. The AXI-lite interconnect data width only supports as 32-bit, which does notallow the bridge to master on the AXI-lite interconnect. The files provided will allow the bridge to create 4-byte burst size transactions on the AXI interconnect when a 1 d-word packet comes in from the upstream component.

To work around this issue, perform the following steps:

  1. Download the ZIP file from the following location:
    http://www.xilinx.com/txpatches/pub/applications/pci/ar43805_axiburst.zip

  2. Right-click the IP and bring the IP local. This will copy and paste the IP from the installation area into the local "pcores" directory.
  3. Within your new local pcore directory, go into the following directory and extract the VHDL files from the ZIP file into this directory: <your_project_directory>/pcore/axi_pcie_mm_s_v1_00_a/hdl/vhdl/

Revision History
11/21/2011 -Updated for13.3
08/30/2011 - Initial Release

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
44969 AXI Bridge for PCI Express - Release Notes and Known Issues for All Versions up to ISE 14.7 N/A N/A

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
44969 AXI Bridge for PCI Express - Release Notes and Known Issues for All Versions up to ISE 14.7 N/A N/A
AR# 43805
Date Created 09/09/2011
Last Updated 05/22/2012
Status Active
Type Known Issues
IP
  • AXI PCI Express (PCIe)