The DFI specification defines an interface protocol between memory controller logic and PHY interfaces, with a goal of reducing integration costs while enabling performance and data throughput efficiency. The protocol defines the signals, timing, and functionality required for efficient communication across the interface. The specification is designed to be used by developers of both memory controllers and PHY designs, but does not place any restrictions on the how the memory controller interfaces to the system design, or how the PHY interfaces to the memory devices.
The DFI specification is being developed by expert contributors from recognized leaders in the semiconductor, IP and electronic design automation (EDA) industries.
DFI Group Releases Final Version DFI 3.1 and Preliminary DFI 4.0 Addendum of its High-Speed Memory Controller and PHY Interface Specification
San Jose, CA , April 8th: Today the DDR PHY Interface (DFI) Group, consisting of leading IP and product companies including ARM, Cadence, Intel, LSI, Samsung, ST and Synopsys, released the final version of the DFI 3.1 specification.
The standard defines an interface protocol between DDR memory controllers and PHY interfaces. It is intended to be used by developers of both memory controllers and PHY designs, but does not place any restrictions on the how the memory controller interfaces to the system design, or how the PHY interfaces to the memory devices. The standard replaces the preliminary DFI 3.1 specification which was available since mid 2012.
In addition the group released a new – preliminary – DFI 4.0 addendum specifically addressing the requirements to support LPDDR4 memories.
The DFI 4.0 addendum includes the following features:
“Mobile consumer devices continue to demand both increased memory performance and power efficiency, requiring the use of the latest available technologies like LPDDR4 memory”," said John MacLaren, Senior Member of Consulting Staff at Cadence Design Systems and chairman of the DFI Group. "We are excited to add LPDDR4 mobile memory support to the DFI standard, enabling the benefits of this technology for the rapidly growing mobile computing market.”
Both the final DFI 3.1 specification as well as the DFI 4.0 addendum is available now for download at www.ddr-phy.org