Description
You may experience problems commanding the Altera® PCI Express® core to the Link Disable state, when configured as an endpoint. The PCI Express core may transmit a truncated (incorrect length) TS1 message during the transition to Electrical Idle.
In simulation, your Root Port BFM may complain about a "TS Ordered set length error".
Resolution
The workaround at this time is to avoid using this optional feature.