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AR# 65719

7 Series GTP/GTH - far-end PMA loopback - TXPIPPMSEL needs to be set to '0'


The current default value for TXPIPPMSEL in UG482 (v1.8) and UG476 (v1.11.1) is '1'.

This is done to select the TXPIPPM controller to control the TX PI.

In far-end PMA loopback, the RX PI needs to control the TX PI.

This is not possible with TXPIPPMSEL=1 and bit errors might be seen on the link during the loopback.


When using far-end PMA loopback in 7 Series GTP and GTH, ensure that TXPIPPMSEL is set to '0'.

7 Series GTP/GTH user guides will be updated in a future release.

(UG576) for UltraScale GTH already reflects this change and it can be referred to for this topic.

Revision History:

10/15/2015 - Initial Release

AR# 65719
Date 10/15/2015
Status Active
Type General Article
  • Artix-7
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  • Virtex-7
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