Are there any known issues with the DDR & DDR2 High-Performance Controller MegaCore function or the ALTMEMPHY megafunction that can cause hardware failures?
Solution Yes, there is a problem with the DDR & DDR2 High-Performance Controller MegaCore® function versions 6.1 & 7.0, and the ALTMEMPHY megafunction in the Quartus® II software versions 6.1 & 7.0. This problem in the megafunction’s calibration sequencer logic block could lead to data corruption when reading from external memory devices, which can cause hardware failures in the megafunction’s supported devices including Stratix® II, Stratix II GX and Cyclone® III devices. The problem is caused by an error in the soft logic block that controls the voltage and temperature tracking (VT) mechanism of the ALTMEMPHY megafunction. Because the problem is dependent on voltage and temperature, it affects only board-level functionality and does not affect design compilation or simulation. Note that this problem is not due to any hardware issues. Your design is affected by this problem if it uses one of the following memory functions: • DDR & DDR2 SDRAM High-Performance Controller MegaCore functi
