AR# 71012


DMA Subsystem for PCI Express (Vivado 2017.4/2018.1) - PCIe to DMA Bypass BAR size cannot be set to 32GB when 64-bit enable is selected


Version Found: v4.0(Rev1) / v4.1

Version Resolved and other Known Issues: (Xilinx Answer 65443)

In Vivado 2017.4 and Vivado 2018.1, the DMA Subsystem for PCI Express IP does not allow the user to set the "PCIe to DMA Bypass Interface" BAR size setting to 32GB if 64 bit is enabled. 

It is limited to a 2GB size.

This issue was not present with this IP in Vivado 2017.3 or earlier versions. 

It is observed only when targeting the IP to non UltraScale+ devices.

This article is part of the PCI Express Solution Centre

(Xilinx Answer 34536)Xilinx Solution Center for PCI Express


This is a known issue to be fixed in a future release of the core.

To fix the issue in Vivado 2017.4 and 2018.1, please install the respective patches provided in this answer record.

For instruction on installing the patch, please check the instructions in the 'patch_readme' directory in the attached patch file.

Revision History:

04/30/2018 - Initial Release


Associated Attachments

AR# 71012
Date 04/30/2018
Status Active
Type Known Issues
People Also Viewed