JEDEC released the UFS 4.0 standard

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Today JEDEC released the latest JESD220F, the UFS 4.0 standard, which is an update to version 3.1 released in 2020.

UFS 4.0 standard

To simplify design, reduce system cost, and improve device performance, JEDEC provides several complementary standards, namely:
  • JESD220-3A UFS High Performance Booster (HPB) Extension
  • JESD223E UFS Host Controller Interface (UFSHCI) version 4.0
  • JESD220-1A UFS Unified Memory Extension version 1.1
  • JESD223-1B UFS Host Controller Interface, supporting Unified Memory Extension version 1.1
  • JESD224 UFS (Test)
  • JESD231 UFS File Based Optimizations (FBO) Extension, version 1.0
Developed for mobile devices requiring high performance and low power consumption, the UFS 4.0 standard is a high-performance interface that will bring significant bandwidth and data protection improvements. Through the UFS 4.0 and UFSHCI 4.0 standards, the following improvements have been made compared to the previous generation:
  • To achieve the highest performance and most power efficient data transport, JEDEC UFS leverages industry–leading specifications from the MIPI® Alliance to form its Interconnect Layer. This collaboration continues with UFS 4.0, which leverages the M-PHY® version 5.0 specification and the UniPro® version 2.0 specification to double the UFS interface bandwidth and enable up to ~4.2 GB/s for read and write traffic.
  • Introduced Multi-Circular Queue definition for more demanding storage I/O patterns
  • Advanced RMPB interface allows increased bandwidth and protection for secure data
The UFS 4.0 standard also provides several enhancements aimed at improving overall device functionality, power efficiency, and easy integration of future solutions:
  • Utilizes a more efficient VCC=2.5V as opposed to the 3.3V supported in the prior version of the standard
  • Improved system latencies by enabling High Speed Link Startup, Out of Order Data Transfer and the BARRIER Command
  • Eases system integration by introducing Enhanced Device Error History with host configurable timestamps and M-PHY’s Eye Monitor
  • Preserves backwards compatibility with UFS 3.1 and 3.0 to allow mixed systems applications
Samsung launched the industry’s first UFS 4.0 flash memory solution in May this year. The new generation of products adopts Samsung’s seventh-generation V-NAND flash memory technology and proprietary controller, enabling the sequential read speed of UFS 4.0 flash memory to reach 4200MB/s and the sequential write speed to reach 2800MB/s. Samsung has previously announced that the UFS 4.0 flash memory chip will enter the mass production stage this month, and it is believed that it will soon appear on the new generation of flagship mobile phones of various brands.

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