Serial transmission can use a faster clock (clock information can be embedded in the data stream). All high-speed transmission buses, such as SATA, PCIe, and SAS, are serial differential signals. Ⅲ Why is UFS so fast?įirst, it uses differential serial transmission for data signal transmission. Memory cards in mobile phones are getting faster and faster, from SD cards to eMMC cards to UFS cards. On computers, from HDD to SSD, from SATA SSD to PCIe SSD, hard drives are getting faster and faster. In recent years, flash memory technology has advanced to the point that it is now faster than ever, whether it is a hard disk on a computer or a storage device in a mobile phone. Otherwise, no matter how fast the CPU and no matter how large the memory is, your mobile phone will still make you feel uncomfortable. The fast pace of CPU and memory makes the storage device also need to work hard to keep up. Among CPU, memory, and storage devices, the slowest one is the storage device. To make mobile phones faster, mobile phone manufacturers use methods, including more and faster CPUs, larger system memory, and faster storage devices. Because it is impossible to fit a mechanical device into a small mobile phone, the storage device on the phone must be electronic, and the storage medium must be flash memory.Īs a result, people's expectations for mobile phones are increasing: the speed should be quick, the capacity should be vast, the operation should be smooth and not stuck. The latter is an electronic storage device with flash memory as the storage media. The storage medium is a magnetic disk, whereas the former is a mechanical storage device. The storage device is equivalent to a computer's hard drive, which is used to store data on the phone for a long time, such as videos, photos, music, and system data.Ĭomputer hard drives include mechanical hard drives (HDD) and solid-state drives (SSD). And the hard drive can store data for a long time.Įvery day, we use a mobile phone, which is effectively a little computer with three key components: a CPU, memory, and storage devices. The memory temporarily stores the data needed when the program is running. Calculation and control are carried out by the CPU. We know that our computer consists of three major parts: CPU, memory, and hard drive. The Linux kernel already supports the UFS format. UFS is based on the small computer system interface SCSI Architectural model and supports SCSI Tagged Command Queuing. At the same time, half-duplex is changed to full-duplex. ![]() The biggest difference between UFS and eMMC is that the parallel signal is changed to a more advanced serial signal, which can quickly increase the frequency. UFS implements a full-duplex LVDS serial port, which has a wider bandwidth than eMMC with 8 parallel threads. ![]() It has a speed of 2.9Gbps per thread to 5.8Gbps per thread. UFS uses the M-PHY physical layer developed by the MIPI Alliance. UFS card is the replacement of embedded MultiMediaCard (eMMC) and SD card. The specification is supported by several market leaders in consumer electronics, including Nokia, Sony Mobile Communications, Texas Instruments, STMicroelectronics, Samsung, Micron, SK Hynix, etc. UFS (Universal flash storage) has two meanings, one refers to the mobile phone storage interface protocol, similar to SATA, PCIe/NVMe. The other is storage devices that use this protocol.
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