Solution ID: rd09232009_29
Last Modified: Sep 28, 2009
Product Category: Devices
Product Area: Gigabit Transceiver
Product Sub-area: Protocols
Software: Quartus II PC
Device Family: ARRIA II GX,STRATIX II GX
Title
Are there any known issues forcing the 8b10b disparity through channel interface?
Description
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.
Feedback
Altera does not warrant that this solution will work for the customer's intended purpose and disclaims all liability for use of or reliance on the solution.
