AR# 71732


UltraScale+ PCI Express Integrated Block (Vivado 2018.2) - pcie_rq_tag_vld1 behavior in Internal Tag Management mode when straddle option is disabled


In a design with "Internal Tag Management" enabled and the straddling option disabled, pcie_rq_tag_vld1 is asserted when consecutive reads are initiated on the s_axis_rq_* interface.

However, the IP product guide (PG213) seems to indicate it should not be asserted with the following statement:

"When the Straddle option is disabled, only pcie_rq_tag_vld0 is used."

This article is part of the PCI Express Solution Centre

(Xilinx Answer 34536)Xilinx Solution Center for PCI Express


The statement provided in (PG213) is not correct. (PG213) will be updated with the following statement in the next release of the document.

"Use of pcie_rq_tag_vld0 & pcie_rq_tag_vld1 are orthogonal to whether the 'Straddle' option is enabled. The PCIe core could use either of the vld0/vld1 ports to showcase the valid tags".

Revision History:

11/21/2018 - Initial Release

AR# 71732
Date 11/21/2018
Status Active
Type General Article
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