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AR# 63006

Vivado 2014.4, AXI Interconnect - Incorrect ID widths generated for cascaded AXI Interconnects in IP Integrator

Description

In my design I have 4 incoming slave interfaces, each with AXI ID widths of 4 bits going to an Interconnect from an upstream interconnect.

However, the master interface has an ID width of 4 instead of 6 as expected. 

Is this an issue?

Solution

The example above is incorrect tool behavior.

The ID_WIDTH of the AXI Interface should be 6, assuming that ID-width decreasing features like data-width conversion, Minimize Area (SASD) strategy, or AXI4-Lite protocol conversion are accounted for.

Incorrect ID width can result in functional issues.

To work around this issue, consider increasing the maximum ID width of the incoming master, this often results in a correct ID width.

Using individual AXI Crossbar components can be another temporary workaround.

This issue is planned to be fixed starting in Vivado 2015.1.

AR# 63006
Date Created 12/02/2014
Last Updated 12/03/2014
Status Active
Type General Article
Tools
  • Vivado Design Suite - 2014.4
  • Vivado Design Suite - 2014.3
IP
  • AXI Interconnect