JEDEC
STANDARD
Universal Flash Storage (UFS)
Version 3.0
JESD220D
(Revision of JESD220C, March 2016)
JANUARY 2018
JEDEC SOLID STATE TECHNOLOGY ASSOCIATION
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JEDEC Standard No. 220D
-i-
UNIVERSAL FLASH STORAGE (UFS)
Contents
Page
1 Scope 1
2 Normative Reference 1
3 Terms and Definitions 2
3 Terms and Definitions (cont’d) 3
3.1 Acronyms 3
3.1 Acronyms (cont’d) 4
3.2 Conventions 4
3.3 Keywords 5
3.4 Abbreviations 5
4 Introduction 6
4.1 General Features 6
4.2 Interface Features 7
4.3 Functional Features 7
5 UFS Architecture Overview 8
5.1 UFS Top Level Architecture 8
5.2 UFS System Model 11
5.3 System Boot and Enumeration 11
5.4 UFS Interconnect (UIC) Layer 12
5.4.1 UFS Physical Layer Signals 12
5.4.2 MIPI UniPro 12
5.4.3 MIPI UniPro Related Attributes 13
5.5 UFS Transport Protocol (UTP) Layer 13
5.5.1 Architectural Model 14
5.6 UFS Application and Command Layer 18
5.7 Mechanical 19
6 UFS Electrical: Clock, Reset, Signals and Supplies 20
6.1 UFS Signals 20
6.2 Reset Signal 22
6.3 Power Supplies 22
6.4 Reference Clock 23
6.4 Reference Clock (cont’d) 24
6.4.1 HS Gear Rates 26
6.4.2 Host Controller requirements for reference clock generation 27
6.5 External Charge Pump Capacitors (Optional) 28
6.6 Absolute Maximum DC Ratings and Operating Conditions 29
7 Reset, Power-up and Power-down 30
7.1 Reset 30
7.1.1 Power-on Reset 30
7.1.2 Hardware Reset 31
7.1.3 EndPointReset 32
7.1.4 Logical Unit Reset 33
