Yes. When ‘Channel Interface’ option is enabled, forcing the 8b/10b disparity through the tx_datainfull[] port does not work. All transceiver designs using ‘Channel Interface’ option in Quartus® II 9.0 SP2 and prior versions will be affected.
The affected device families are Arria® II GX, Stratix® II GX and Stratix® IV GX/GT.
Workaround:
Manually modify the following parameter in the alt2gxb/altgx Megawizard generated wrapper file
For Stratix II GX
alt2gxb_component.tx_force_disparity_mode = "false",
Change “false” to "true“
For Stratix IV/Arria II GX
transmit_pcsx.disparity_mode = "none", (0,1,….(num of channels -1))
Search for the above parameter and change “none” to “new”
This issue will be fixed in future Quartus® II version. You should select the ‘create forcedisp…’ option in the 8b/10b screen Megawizard™ and recompile the design.