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AR# 64218

High Speed SelectIO Wizard - Unable to select 3-state function for TX Interface


The 3-state control at the IOB should be connected from the T_OUT signal of the TX_BITSLICE.

However, the 3-state can either be sourced from the TX_BITSLICE_TRI where serialization of the 3-state occurs using the TBYTE_IN input, or from the combinatorial path through the TX_BITSLICE through the T input from interconnect logic.

Currently the High Speed SelectIO Wizard does not support the use of these 3-state inputs for the TX only interface type.
Note: It is supported for the RXTX Bidirectional Interface.


To work around this issue you can use the High Speed SelectIO to set up everything else that is required for your interface and generate the output products. 

Then replace the .XCI file with the <<component name>>.v and other required files. 

The LOC and IOSTANDARD constraints will also need to be added.

They can be found in the <<component name>>.xdc file.

Note: the port names may need to be changed.

Once the files have been replaced you can edit the  files to change the 3-state connections.

Please refer to (Xilinx Answer 64216) High Speed SelectIO - Known Issue List for software version that the issue is resolved in.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
64216 High Speed SelectIO Wizard - Known Issue list N/A N/A
AR# 64218
Date Created 04/10/2015
Last Updated 05/13/2015
Status Active
Type General Article
  • Kintex UltraScale
  • Virtex UltraScale