Quartus® II software version 9.1 will not optimize the sampling window for Stratix® IV devices when using the ALTLVDS Megafunction configured as a receiver with non-DPA hard-SERDES on left and right I/O banks. The sampling window specification as reported in timing analysis could be violated in the Quartus II software version 9.1 release.
As a result, the receiver may not sample the data correctly. This will be fixed in a future release of Quartus II software.
To resolve this problem in Quartus II software version 9.1, download and install the appropriate patch from the links below. You will need to re-compile your project after the patch is installed.
- Quartus II software version 9.1 Linux Patch 0.62
- Readme file for Quartus II software version 9.1Linux Patch 0.62
- Quartus II software version 9.1 Windows Patch 0.62
- Readme file for Quartus II software version 9.1 Windows Patch 0.62
This is fixed in the Quartus II software version 9.1SP1.