It is due to the reason that the pause frame received signal is not aligned with receive clock enabled signal when operating in 10/100 Mbps mode, thus registered-valid-statistics-frame signal which is used by aFramesReceivedOK statistics counter to identify a valid received frame is never get asserted.
The following patch provides a solution to align pause frame received signal with receive clock enabled signal so that registered-valid-statistics-frame signal is asserted when pause frame is received in 10/100Mbps mode.
Please download the appropriate Quartus® II software version 10.0SP1 patch 1.210 from the following links:
You must either have previously installed the Quartus II 10.0 SP1 software or must install the Quartus II 10.0 SP1 software before installing this patch. Otherwise, the patch will not be installed correctly and the Quartus II software will not run properly.
After you install the patch please regenerate your Triple Speed Ethernet MegaCore® before you compile your design.