JEDEC this week printed their UFS three.Zero specification, which is meant to carry quite a few efficiency, energy and have set-related enhancements to the usual. The model three.Zero of the spec doubles the per-lane efficiency of an eUFS gadget to 11.6 Gbps, which will increase the height knowledge switch price of a storage gadget to 23.2 Gbps. On the identical time, the brand new normal introduces a 2.5 V VCC energy provide mode that permits decrease energy consumption and help for the newest kinds of NAND. Lastly, the united states3.Zero spec incorporates options designed particularly for automotive functions that allow normal help for prolonged temperature ranges in addition to “refresh” operation to spice up reliability.
One of many key enhancements of the united states3.Zero (JESD220D) specification is the utilization of MIPI's M-PHY four.1 bodily layer in addition to the not too long ago launched MIPI UniPro 1.eight protocol to type the interconnect layer (IL). The brand new IL helps knowledge charges of as much as 11.6 Gbps (HS-Gear4) per lane in addition to QoS options to allow a extra dependable hyperlink via monitoring and coaching of the communication channel. All UFS three.Zero-compatible units are required to help HS-G4 (11.6 Gbps) and HS-G4 (5.eight Gbps), which implies that all of them might be sooner than UFS 2.Zero/2.1-compliant units that don’t essentially help HS-G3. UFS three.Zero storage units will proceed to function as much as two full-duplex lanes, which suggests a theoretical most bandwidth of as much as 23.2 Gbps (2.9 GB/s) when HS-G4 is used. The MIPI M-PHY four.1 normal continues to make use of 8b10b line encoding, so accounting for the encoding overhead, the precise achievable bandwidth by an embedded UFS gadget might be significantly decrease than the theoretical one — 15 Gbps (1.875 GB/s) is one thing that’s cheap to count on.
The upcoming eUFS three.Zero storage units would require three completely different energy rails: 1.2 V for VCCQ, 1.eight V for VCCQ2, in addition to 2.5 V/three.three V for VCC. The addition of two.5 V for VCC is to allow help for the newest and upcoming generations of NAND flash with larger bit densities (together with 3D NAND with larger quantities of layers in addition to 3D TLC NAND).
The united states3.Zero normal additionally helps quite a few options notably appropriate for the automotive business. UFS three.Zero units could help a local predefined low/excessive temperature occasion notification which is able to simplify growth of UFS-based automotive functions. Prolonged temperature ranges (-40°C, 105°C) might be optionally supported by host controllers. Moreover, the latter may additionally undertake a regular “refresh” perform to increase knowledge retention by shifting knowledge from cell to cell to maintain prices at ample ranges.
One other essential innovation of the united states3.Zero spec is enhanced help for RPMBs (replay protected reminiscence block). The brand new normal helps a number of RPMBs with a number of RPMB keys. Moreover, RPMB areas can now be configured at manufacturing, simplifying their utilization for gadget makers.
To simplify growth of UFS-based functions going ahead, JEDEC additionally launched JESD223D — a purposeful specification of a UFS host controller interface (UFSHCI). This spec defines options and registers that must be supported by UFS three.Zero host controllers and allow utilization of a regular driver for all functions that includes UFS three.Zero-compatible storage units.
The united states3.Zero normal significantly quickens efficiency and capability of storage subsystems inside smartphones, tablets, media gamers, VR headsets, automotive and different functions which are going to make use of it. In the meantime, it’s not clear when this may occur. There may be at the least one firm who has been providing UFS three.Zero controllers since Q2 2017, but it surely seems to be like the newest cell SoCs from Qualcomm, HiSilicon, MediaTek and Samsung don’t help the brand new spec. That stated, count on functions primarily based on the brand new normal to be launched within the coming years, simply not in 2018.
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