Black cat takes you to learn UFS protocol Chapter 4: detailed explanation of UFS protocol stack

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1 UFS Protocol stack framework

UFS Define a complete protocol stack . From top to bottom , The application layer 、 Transport layer 、 Data link layer and physical layer .UFS Use MIPI（Mobile Industry Processor Interface , Mobile industry processor interface ） The league UniPro As the data link layer and MIPI Of M-PHY As the physical layer , Together, the two are called interconnection layers （UFS InterConnect Layer）.

As shown in the figure , by UFS Protocol stack block diagram ：


Be careful ： This version of the standard assumes that only one device is connected to one UFS port . More topologies will be defined in future versions of the specification .

Application Layer and UTP： comply with SCSI standard
M-PHY and UniPro： comply with MIPI standard

2 application layer （UAP）

The application layer contains ：ufs Command set （U