For designs in Stratix® V devices using the ALTDQ_DQS2 megafunction with hard input FIFO enabled, there is a known issue where the hard input FIFO is not instantiated correctly. When enabling hard input FIFO, take note of the following:
1. You must instantiate both “stratixv_read_fifo” and “stratixv_read_fifo_read_enable” blocks as per the UniPHY implementation
2. Some edits are required for “altdq_dqs2_stratixv_<design_file_name>.sv”, otherwise you will get the following fitter error during compilation:
Error (175001): Could not place DQS Logic Block – Dynamic OCT Control Path fed by DQS I/O pad
Contact Altera® Support for details regarding the “stratixv_read_fifo” and “stratixv_read_fifo_read_enable” blocks as well as the changes required in the “altdq_dqs2_stratixv_<design_file_name>.sv” file.
This issue will be fixed in a future version of the Quartus® II software.