This user guide describes the features of the Altera ALTDQ_DQS2 Megafunction
The ALTDQ_DQS2 megafunction controls the double data rate (DDR) I/O elements for data (DQ) and data strobe (DQS) signals in Stratix V devices. It provides access to dynamic on-chip termination controls, high-performance support for DDR interface standards, and programmable DQ group widths ranging from 4 to 36 bits.
The guide details parameter settings configurable through the MegaWizard Plug-In Manager or the command-line interface (CLI). It covers features such as half-rate registers, I/O delay chains for fine-tuning delays, and various capture strobe configurations including single, differential, and complimentary types.
| Supported Devices | Stratix V devices only |
|---|---|
| DQ Group Widths | 4- to 36-bit programmable |
| Memory Frequency | 200-600 MHz |
| Pin Width | 1 to 36 |
You can parameterize the megafunction using the MegaWizard Plug-In Manager or the command-line interface (CLI).
The default value for the Pin Width parameter is 9.
The default capture strobe type is Single.