Altera External Memory PHY Interface - Manual (Page 5)

© Juanuary 2010 Altera Corporation External Memory PHY Interface (ALTMEMPHY) (nonAFI) Megafunction User Guide
1. About this Megafunction
This user guide is only for legacy designs as it describes the specifications and
functional descriptions of the ALTMEMPHY megafunctions that are common to
non-Altera PHY interface (nonAFI) variations. This user guide also describes the
implementation of the QDR II+ and QDR II SRAM interfaces for legacy designs
targeted for Arria
® GX, Stratix ® II, and Stratix II GX devices.
The ALTMEMPHY megafunction is an interface between a memory controller and
memory devices and performs read and write operations to the memory. The
megafunction is available as a stand-alone product or as an integrated product with
Altera
® high-performance memory controllers. As a stand-alone product, use the
ALTMEMPHY megafunction with either custom or third-party controllers.
The ALTMEMPHY megafunction for DDR3, DDR2, and DDR SDRAM offers two
different PHY-to-controller interfaces: Altera PHY interface (AFI) and nonAFI. The
AFI is supported for all variations of ALTMEMPHY for DDR3, DDR2, and DDR
SDRAM. ALTMEMPHY for DDR3 SDRAM only support the AFI. The AFI results in a
simpler connection between the PHY and controller, so Altera recommends that you
use the AFI for new designs; only use the nonAFI for legacy designs.
f For information about using the external memory interfaces (DDR3, DDR2, and DDR
SDRAM) with AFI and the ALTMEMPHY megafunction, refer to
Volume 3:
Implementing Altera Memory Interface IP of the External Memory Interface Handbook.
f For more information about the ALTMEMPHY megafunction features, refer to Volume
3: Implementing Altera Memory Interface IP of the External Memory Interface Handbook.
f For information about issues on the ALTMEMPHY megafunction in a particular
Quartus
® II software version, refer to the Quartus II Software Release Notes