Device Family: Arria® V GZ, Stratix® IV GT, Stratix® IV GX, Stratix® V

Type: Answers

Area: Intellectual Property


Last Modified: March 20, 2017
Version Found: v14.1
Bug ID: FB: 375359, 375726;

Why does my Legacy 40/100Gbps Ethernet Mac core have an average IPG of less than 12 sometimes?

Description

Due to a problem in the 40- and 100-Gbps Ethernet MAC and PHY MegaCore Function, you might sometimes encounter average IPGs of less than 12. This problem manifests itself for repeated packets of the exact same size. Randomly sized packets will not exhibit this behavior.

 

Workaround/Fix

There is no planned fix for this issue. To avoid average IPGs of less than 12, ensure that the transmitted packets vary in size.