Ufs 3.1 Pinout May 2026

UFS 3.1 (Universal Flash Storage) uses a high-speed serial interface based on the MIPI M-PHY physical layer and UniPro transport layer. The pinout typically consists of differential pairs for data transmission, a reference clock, a reset signal, and various power supply rails. Core Interface Pins

UFS 3.1 utilizes a low pin-count interface that supports full-duplex operation (simultaneous read/write). Data Lanes (M-PHY):

TX_P / TX_N (Lane 0 & 1): Differential transmit pairs from the host to the UFS device.

RX_P / RX_N (Lane 0 & 1): Differential receive pairs from the UFS device back to the host.

Note: UFS 3.1 commonly supports 2-lane configurations for a maximum raw data rate of approximately 2.9 GB/s total (Gear 4). Clock and Control: REF_CLK: A reference clock signal provided by the host. RST_N: Hardware reset signal (active low). Power Supply Rails

Typical UFS 3.1 devices require three distinct power supplies to balance performance and power efficiency. Voltage Range Description VCC 2.7V – 3.6V Main power for NAND flash operations. VCCQ 1.14V – 1.26V High-speed I/O power (standard for UFS 3.x). VCCQ2 1.70V – 1.95V Power for the controller and auxiliary logic. Standard Packages

UFS 3.1 chips are generally available in standardized Ball Grid Array (BGA) packages:

BGA-153: A 153-ball package commonly used for high-capacity mobile storage.

BGA-254: Often used in Multi-Chip Packages (uMCP) where UFS and LPDDR RAM are integrated. Key Features impacting Electrical Interface

DeepSleep: A low-power state introduced in UFS 3.1 that allows the device to share voltage regulators with other components to save costs and power.

Performance Throttling Notification: A signal-level protocol that allows the UFS device to inform the host of thermal issues. MIPI M-PHY | MIPI

Understanding UFS 3.1 Pinout: A Comprehensive Guide

The Universal Flash Storage (UFS) interface has become a widely adopted standard for storage in mobile devices, laptops, and other applications. UFS 3.1 is the latest iteration of this interface, offering significant performance improvements over its predecessors. As with any electronic interface, understanding the pinout of UFS 3.1 is crucial for designers, engineers, and developers working with this technology. In this article, we will delve into the details of UFS 3.1 pinout, its architecture, and its applications.

What is UFS 3.1?

UFS 3.1 is a high-speed storage interface designed for mobile devices, laptops, and other applications that require fast storage access. It is a successor to the UFS 3.0 interface and offers several improvements, including higher speeds, lower power consumption, and improved reliability. UFS 3.1 supports speeds of up to 23.2 Gbps (gigabits per second), which is significantly faster than its predecessor, UFS 3.0, which supports speeds of up to 17.6 Gbps.

UFS 3.1 Architecture

The UFS 3.1 interface consists of several key components:

UFS Host: The UFS host is the controller that manages the UFS interface. It is typically integrated into the device's system-on-chip (SoC).
UFS Device: The UFS device is the storage component that connects to the UFS host. It can be a flash storage device, such as a solid-state drive (SSD) or a flash memory module.
UFS Interface: The UFS interface is the communication pathway between the UFS host and the UFS device.

UFS 3.1 Pinout

The UFS 3.1 interface uses a 16-pin connector, which is divided into two groups of pins: the UFS Host Pinout and the UFS Device Pinout.

UFS Host Pinout

The UFS host pinout consists of the following pins:

| Pin Number | Pin Name | Description | | --- | --- | --- | | 1 | VDD | Power supply voltage | | 2 | VSS | Ground | | 3 | REFCLK | Reference clock | | 4 | REFCLK | Reference clock (complement) | | 5 | DNC | Do not care (reserved) | | 6 | DNC | Do not care (reserved) | | 7 | RXD0 | Receive data 0 | | 8 | RXD1 | Receive data 1 | | 9 | RXD2 | Receive data 2 | | 10 | RXD3 | Receive data 3 | | 11 | TXD0 | Transmit data 0 | | 12 | TXD1 | Transmit data 1 | | 13 | TXD2 | Transmit data 2 | | 14 | TXD3 | Transmit data 3 | | 15 | CBT | Control signal ( Command, BE and Transfer) | | 16 | VSS | Ground |

UFS Device Pinout

The UFS device pinout consists of the following pins:

Signal Descriptions

The UFS 3.1 interface uses a differential signaling scheme to transmit data. The signal descriptions for the UFS 3.1 interface are as follows:

REFCLK: The reference clock signal is used to synchronize the UFS host and device.
RXD[3:0]: The receive data signals are used to transmit data from the UFS device to the UFS host.
TXD[3:0]: The transmit data signals are used to transmit data from the UFS host to the UFS device.
CBT: The control signal (Command, BE, and Transfer) is used to control the UFS interface.

Applications of UFS 3.1

UFS 3.1 is designed for a wide range of applications, including:

Mobile Devices: UFS 3.1 is used in mobile devices, such as smartphones and tablets, to provide fast storage access.
Laptops: UFS 3.1 is used in laptops to provide fast storage access and improve system performance.
Automotive: UFS 3.1 is used in automotive applications, such as infotainment systems and autonomous vehicles.

Conclusion

In conclusion, the UFS 3.1 pinout is a critical component of the UFS 3.1 interface, which is designed to provide fast storage access for a wide range of applications. Understanding the UFS 3.1 pinout is essential for designers, engineers, and developers working with this technology. This article has provided a comprehensive overview of the UFS 3.1 pinout, its architecture, and its applications. As the demand for fast storage access continues to grow, the UFS 3.1 interface is expected to play an increasingly important role in the development of high-performance storage systems. ufs 3.1 pinout

Future Developments

As technology continues to evolve, we can expect to see further developments in the UFS interface, including higher speeds, lower power consumption, and improved reliability. Some potential future developments include:

UFS 4.0: The next generation of the UFS interface, which is expected to offer even higher speeds and improved performance.
UFS-based storage solutions: New storage solutions that utilize the UFS interface, such as UFS-based SSDs and flash memory modules.

By understanding the UFS 3.1 pinout and its architecture, designers, engineers, and developers can take advantage of the latest storage technologies and develop high-performance storage systems that meet the demands of today's applications.

(Universal Flash Storage) pinouts typically follow the JEDEC JESD220E specification, primarily using package layouts for mobile and embedded devices.

Unlike older eMMC storage that uses a 4-bit or 8-bit parallel bus, UFS 3.1 utilizes a high-speed serial interface

based on the MIPI M-PHY physical layer. This reduces the number of required signal pins while enabling full-duplex communication (simultaneous reading and writing). Kioxia Singapore Pte. Ltd. Critical Signal Groups

The UFS 3.1 interface is defined by a small set of high-performance differential signal pairs and power rails: eMMC vs UFS - Prodigy Technovations

Power Sequence (Strictly Defined)

Apply VCC (3.3V) first.
Then apply VCCQ (1.2/1.8V) and optionally VCCQ2 (1.2V) within 10ms.
De-assert RST_n after all supplies are stable (>1ms delay).

4. Physical Form Factors (BGA Pinouts)

It is important to note that there is no single "universal" pinout diagram for the physical BGA (Ball Grid Array) package. JEDEC defines the interface signals, but the physical ball assignment is determined by the package size and density.

Common package sizes include:

11.5mm x 13.0mm: High-capacity drives (256GB+).
8.0mm x 11.5mm: Standard mid-range.
Small Outline Packages: For wearables and IoT.

Implication for Repair/Forensics: Technicians attempting to read a UFS chip "off-board" (using a programmer like UFI or Easy JTAG) cannot simply locate a generic pinout. They must look up the specific Ball Map (BGA schematic) for that specific model number (e.g., Samsung KLUEG8UHDB-C2B1). Connecting the Data lanes without the correct REFCLK and VCCQ2 voltages will result in communication failure.

3. Common Misconceptions and Pitfalls

Myth: "UFS 3.1 is pin-compatible with UFS 2.1."
False. While many BGA-153 pads overlap, UFS 3.1 introduced VCCQ2 (1.8V) for high-speed I/O. Using a UFS 2.1 pinout may leave VCCQ2 floating, causing unstable writes at Gear 4 speeds.
Myth: "I can probe UFS_TX with an oscilloscope to see data."
Not practical. M-PHY runs at 5.8 Gbps per lane (Gear 4). A standard 100 MHz scope will show only noise. You need a high-bandwidth differential probe (≥ 6 GHz) or a dedicated UFS protocol analyzer.
Myth: "The pinout is universal across all manufacturers."
Mostly false. JEDEC standard specifies ball assignments for power and ground, but data lane positions and strapping pins vary between Samsung, SK Hynix, Western Digital, and Kioxia. Always obtain the vendor-specific datasheet.

Part 3: Detailed Power-Up Sequencing (For Board Design)

UFS 3.1 requires a specific power-on sequence. Violating this can lead to latch-up or failure to initialize.

4. Common Interfacing Scenarios

C. The Control and Management Signals

Beyond the high-speed data paths, UFS requires specific lines for hardware management and low-power states. UFS Host : The UFS host is the

RESET_n: An active-low signal used to reset the device. This is a standard GPIO (General Purpose Input/Output) level signal.
MPHY Power Management:
- MP0_GPIO: Dedicated line for power state control.
- MP1_GPIO: Dedicated line for power state control.
- These pins allow the Host Controller to signal the UFS device to enter specific power modes (like Hibernate or Sleep) without toggling the main power rails.

Conclusion

The UFS 3.1 pinout is not just a random arrangement of balls—it is a carefully engineered high-speed serial interface that demands respect for differential signaling, multiple power domains, and vendor-specific strapping. Whether you are designing a PCB, repairing a flagship device, or attempting forensic data extraction, understanding the key pins (REF_CLK, RST_n, RX/TX pairs, and power rails) will save you hours of troubleshooting and prevent costly chip damage. Always verify your pinout against the component datasheet before applying power, and remember: in the world of UFS, assumptions are the mother of all failures.

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Closing

Always use the exact module datasheet and reference design; UFS physical pinouts and required rails are vendor-specific. For implementation, base your PCB and power sequencing on the manufacturer’s documents.

(Note: I can make a sample 2-lane BGA pin map and PCB routing checklist if you want a concrete pin diagram for a typical UFS 3.1 2-lane module — say yes and tell me target module/vendor or accept a generic example.)

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The UFS 3.1 standard (JESD220E) utilizes a 153-ball BGA (Ball Grid Array) package, typically measuring

. Because UFS is a high-speed serial interface based on the MIPI M-PHY physical layer, it uses differential pairs for data transmission, which significantly reduces the total pin count compared to older parallel standards like eMMC. 📌 Core Pinout & Signal Groups

While the physical grid has 153 positions, only a fraction are active signals. The primary functional groups include: Data Lanes (Differential Pairs): TX_P/TX_N: Transmit differential pairs (Lanes 0 and 1). RX_P/RX_N: Receive differential pairs (Lanes 0 and 1).

UFS 3.1 supports up to 2 lanes for a maximum theoretical bandwidth of 23.2 Gbps. Power Rails (VCC): VCC: Main power supply for NAND flash memory (

VCCQ / VCCQ2: Low-voltage supply for the controller and I/O interface (typically Control & Clock:

REF_CLK: Reference clock input (square wave) required for High-Speed (HS) modes. RST_N: Hardware reset signal (active low).

Ground (VSS): Multiple ground balls distributed throughout the array to maintain signal integrity and reduce EMI. 📝 White Paper & Technical Resources

If you are looking for formal documentation or a "paper" on the standard, you can access these authoritative sources:

Official JEDEC Standard: The full technical specification for UFS 3.1 is JESD220E. You can find it on the JEDEC Official Site. (Note: It may require a paid membership or registration for full access).

Manufacturer Datasheets: Detailed pin maps and electrical characteristics for specific UFS 3.1 chips are provided by vendors. Kingston UFS 3.1 Datasheet via DigiKey. Kioxia UFS 3.1 Overview. multiple power domains

Technology Overviews: For a high-level comparison of UFS 3.1 vs. other storage, Samsung's UFS Card White Paper explains the underlying architectural advantages of the UFS interface. 🛠️ Hardware Integration Tips UFS (Universal Flash Storage) - JEDEC