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  • Learn about UFS 2.0 new flash standards

    A mobile phone consists of many components, in addition to the processor, running memory, graphics processor and other core hardware will affect the performance of mobile phones, flash is also an impact on performance and mobile phone read speed an important indicator. In the past few years in the rise of mobile phones, mobile phone flash drive specifications have been greatly improved from the eMMC standard gradually evolved from the eMMC 4.3 era to the current eMMC 5.0 storage products, mobile phone flash performance has been very large improve. However, in the mainstream flagship mobile phones are now using eMMC 5.0 specifications flash memory, a new flash profile quietly appears, it is UFS 2.0 flash standard, with eMMC 5.0 faster than the read performance.

    The full name of the eMMC is called "embedded Multi Media Card", which is developed by the MMC Association, mainly for embedded products such as mobile phones or tablet PCs. One of the obvious advantages of eMMC is the integration of a controller in the package, which provides a standard interface and manages flash memory. The eMMC utilizes the main controller and flash memory into a small BGA package. Now, eMMC 4.5 has come out, eMMC 4.4 read speed of about 104MB / s, eMMC 4.5 was 200MB / s, performance was very good at the time; and in July 29, 2013 Samsung began mass production industry first EMMC 5.0 storage products, the read speed of 400MB / s, but because the use of the 8-bit parallel interface, so the performance potential has been basically reached the bottleneck to the latest eMMC 5.1 specification, the theoretical bandwidth of 600MB / s or so, The performance of the upgrade is basically impossible.

    UFS 2.0

    The UFS 2.0 flash memory specification uses a new standard, it uses a serial interface, much like PATA, SATA conversion. And it supports full-duplex operation, can read and write operations, also supports instruction queue. In contrast, eMMC is half duplex, read and write must be implemented separately, the instructions are packaged, the speed is already slightly inferior. And UFS chip not only transmission speed, power consumption is also lower than eMMC 5.0 half, it can be said that the future flagship mobile phone flash with the ideal. In fact, JEDEC in September 2013 has released a new generation of UFS 2.0 flash memory storage standard, UFS 2.0 flash memory read and write speed can be up to 1400MB per second, which is equivalent to read and write in two seconds, two CD-ROM data, Not only has a greater advantage than eMMC, and it can even make the use of flash memory storage media on the solid state hard drive is dwarfed, in addition to the speed performance has a huge advantage, in terms of power consumption UFS 2.0 also better performance. In fact, if compared from the power consumption, even a new generation of UFS 2.0 standard is also able to be flat with eMMC. However, eMMC and UFS 2.0 in the operation of the power consumption of about 1mW (milliwatts), while the standby state power consumption will be less than 0.5mW. When UFS 2.0 is full, the power consumed is actually more than eMMC, but it can be faster to complete the operation and switch to the standby state earlier, so the performance of UFS 2.0 and eMMC performance comparable. In terms of transmission speed, UFS 2.0 can be said to be far more than eMMC. Even if compared with the current latest eMMC 5.0 standard, UFS 2.0 speed is also higher than 3 times. UFS 2.0 can be in the UFS host and flash memory in full-duplex mode to exchange, read and write can be executed at the same time. In addition, UFS 2.0 additional control channel can effectively ensure the safe transmission of data, no longer because of read and write operations and do unnecessary waiting, which is UFS 2.0 to achieve higher speed key. It is understood that UFS 2.0 has two versions, there are two transmission channels. HS-G2 theoretical bandwidth is 5.8Gbps, which is more than 740MB / s, HS-G3 is doubled to 11.6Gbps, close to 1.5GB / s, speed UFS 2.0 victory.

    to sum up

    Although eMMC in transmission speed and performance is not the latest UFS 2.0, but in the future for a long period of time, or will continue to occupy the mainstream of mobile products flash memory chips. Because eMMC has a more mature process, to large-scale production, lower cost is more suitable for popular mobile products flash memory chip demand; and UFS 2.0 although very good, but the higher production costs, in the beginning now into the market early, only Is used on high-end products. But now the trend of view, UFS 2.0 will gradually become the mainstream of the mobile product market is not a problem, after all, technology is the need for progress.