Critical Issue
This problem affects products on Stratix V devices, targeting DDR3 LRDIMMs, with versions of the Quartus II software earlier than 14.0.
DDR3 LRDIMM interfaces on Stratix V devices may not reliably operate at frequencies above 533 MHz.
Also, if you are using half-rate mode or are targeting a multi-slot LRDIMM configuration, a patch is required to ensure proper assertion of ODT.
The workaround for these issue is as follows:
- For DDR3 LRDIMM interfaces on Stratix V devices, install version 14.0 or later of the Quartus II software to ensure reliable interface operation at frequencies above 533 MHz.
- For DDR3 LRDIMM interfaces on Stratix V devices using half-rate mode or targeting a multi-slot LRDIMM configuration, contact Altera for a patch to modify the assertion of ODT for multi-DIMM topologies and half-rate modes.
These issues are fixed in a future version.