Pinout | Ufs 3.1

Headline: Decoding the UFS 3.1 Interface: A Pinout Breakdown 🧵

As storage demands skyrocket in mobile devices, Universal Flash Storage (UFS) has become the industry standard, leaving eMMC in the dust. But what makes UFS 3.1 tick? It’s all about the lanes.

If you're looking at a UFS 3.1 BGA footprint, here is the critical pinout logic you need to know:

🔹 The Differential Pairs: Unlike the parallel bus of eMMC, UFS relies on high-speed differential signaling.

🔹 Power Management:

🔹 Form Factor: Most commonly a 153-ball BGA package, but pin mappings can vary slightly by manufacturer (Samsung, Kioxia, Micron, SK Hynix). Always cross-reference the specific datasheet!

💡 Pro Tip: If you are doing board rework, check the CMD and RST_N lines first if the device isn't enumerating.

#HardwareDesign #EmbeddedSystems #UFS #StorageTechnology #Pinout #PCBDesign

The UFS 3.1 pinout is defined around M-PHY differential pairs plus separate core and I/O voltages. Successful interfacing requires strict power sequencing, clean differential routing, and correct reference clock. Always obtain the chip's dimensioned ball map (from datasheet or board schematic) before soldering or probing.

Last advice: If doing data recovery, use an UFS adapter with pre-configured termination and voltage selection. DIY wiring often fails due to signal integrity loss at HS-G4 speeds (≈ 2.9 Gbps per lane).

As of 2025, UFS 4.0 is entering the mainstream. Its pinout is identical in ballmap to UFS 3.1 (153-ball BGA) but doubles the per-lane speed to 23.2 Gbps using M-PHY HS-G5.

For engineers today, mastering UFS 3.1 pinout means:

Whether you are repairing a bricked smartphone or designing a high-end ADAS system, the 153 balls of the UFS 3.1 package hold the keys to high-speed, reliable storage. Treat them with the respect that 11.6 Gbps demands.

Appendix: Quick Reference Checklist for PCB Layout

For specific ball coordinates (e.g., exact location of D2, M3), always refer to the latest JEDEC JESD220-3 standard or your component vendor's datasheet, as mask revisions may shift reserved pins.

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 3.1 pinout

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:

Applications of UFS 3.1

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

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.

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:

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.

In the context of hardware repair and data forensics, the most "helpful feature" of a UFS 3.1 pinout is its support for In-System Programming (ISP)

. This allows technicians to connect directly to the storage chip's data lanes without removing it from the motherboard, significantly reducing the risk of heat damage to the chip or surrounding components. Forensic Focus Key Helpful Features of UFS 3.1 Pinouts Samsung 512GB UFS 3.1 - Upgrade Guide & Performance 2026

(Universal Flash Storage) pinouts typically follow the JEDEC JESD220E specification, primarily using package layouts for mobile and embedded devices. Headline: Decoding the UFS 3

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

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.

standard (JESD220E) typically uses a 153-ball BGA (Ball Grid Array) package, similar to previous UFS generations like 2.1 and 3.0, but with updated electrical specifications for higher speeds. Key Signals and Power Rails

UFS 3.1 utilizes a differential serial interface (M-PHY) with up to two lanes for data transfer. Mouser Electronics Data Lanes (Differential Pairs): DIN_t / DIN_c: Input data lanes (Host to Device). DOUT_t / DOUT_c: Output data lanes (Device to Host). Power Supplies: VCC (2.7V – 3.6V): Main power for the NAND flash media. VCCQ (1.14V – 1.26V): Power for the UFS controller and I/O interface. VCCQ2 (1.7V – 1.95V):

Typically used for the M-PHY layer or other low-voltage internal modules. Control Signals:

Reference clock input (square wave, single-ended), critical for High-Speed (HS) modes. Hardware reset signal (active low). Mouser Electronics Pin Assignment Groups (153-Ball BGA)

While the full 153-ball map contains many ground (GND) and "No Connect" (NC) pins, the critical functional pins are clustered as follows: Core Voltage

Typically multiple pins (e.g., A3, B3, C3) for current capacity. I/O Voltage Low voltage rail (1.2V typical). PHY Voltage Mid-range voltage rail (1.8V typical). Transmit Pairs

Differential output signals from host view (DIN for device). Receive Pairs

Differential input signals from host view (DOUT for device). Reference Clock Necessary for HS-G3 and HS-G4 modes. System reset pin. In-System Programming (ISP) Points

For data recovery or forensic tasks, "ISP" refers to soldering directly to specific test points on a PCB rather than the full BGA grid. Common ISP connections for UFS 3.1 include: VCC & VCCQ TX0_P/N & RX0_P/N (Data Lane 0) Some UFS 3.1 implementations require a 10-ohm resistor

on the TX line to ground to enable communication with certain flasher boxes. ball-by-ball map

for a specific package size, such as the 11.5mm x 13mm variant?

JEDEC Publishes Update to Universal Flash Storage (UFS) Standard 30 Jan 2020 —

UFS 3.1 introduces new features intended to help maximize device performance while minimizing power usage. 153-Ball Automotive UFS Memory - Mouser Electronics

Universal flash storage (UFS) controller and NAND. Differential I/O pins. – 2 lanes supported. – High speed: Gear 1/2/3 supported. Mouser Electronics

UFS 3.1协议分析(第六章) -- UFS电气信号 - CSDN博客 22 Sept 2021 —

UFS信号 UFS供电复位参考时钟. UFS有三个供电电压,分别是VCC、VCCQ、VCCQ2。 ufs3.1中规定的电压值范围为: VCC从300mV上升到2.4V / 2.7V时间为35ms. CSDN博客 UNIVERSAL FLASH STORAGE (UFS 3.1) 🔹 Power Management:

* Deep Sleep(mA) VCCQ(1.2V) VCC(2.5V) VCCQ(1.2V) 537. 124. 439. 0.36. 0.05. 0.15. 0.06. „Mouser Electronics“ Lietuva Samsung UFS Card 7 Apr 2016 —

UFS 3.1 (Universal Flash Storage) standard, published by JEDEC as JESD220E, utilizes a high-speed serial interface designed to balance massive throughput with minimal power consumption. While standard storage like eMMC uses a parallel interface with many pins, UFS 3.1 employs a low pin-count serial interface

to simplify circuit board routing and reduce the physical footprint of mobile and automotive devices. KIOXIA America, Inc. UFS 3.1 Physical Interface & Pinout UFS 3.1 chips typically use a 153-ball BGA (Ball Grid Array)

package with an 11mm x 13mm profile. The pinout is organized around the MIPI M-PHY physical layer

, which uses differential signaling to achieve high data rates. KIOXIA America, Inc. Primary Signal Groups Differential Data Lanes (TX/RX):

UFS 3.1 supports up to two lanes for data transfer. Each lane consists of a differential pair: DIN_t / DIN_c: Data Input (Receive) pair from the host. DOUT_t / DOUT_c: Data Output (Transmit) pair to the host. Full Duplex

architecture allows the device to read and write data simultaneously, a major advantage over the half-duplex eMMC standard. Reference Clock (REF_CLK):

A critical pin providing the base frequency for the internal high-speed oscillators. It is recommended that this clock is stable before transitioning into high-speed modes. Hardware Reset (RST_n):

An active-low signal used by the host to perform a hardware-level reset of the UFS device. KIOXIA Corporation Power Supply Pins

To maintain high efficiency, UFS 3.1 utilizes multiple voltage rails: Main power supply for the NAND flash memory. Power supply for the controller and I/O interface.

A secondary, lower-voltage supply for the ultra-low-power physical layer (M-PHY). Key Features Enabled by the Pinout

The specialized pinout of UFS 3.1 supports several advanced power and performance features introduced in the 3.1 standard:

UFS 3.1 for Consumer & Industrial | KIOXIA - United States (English)

Demystifying the UFS 3.1 Pinout: A Guide for Hardware Engineers

Universal Flash Storage (UFS) 3.1 has become the gold standard for high-performance mobile storage, offering a massive leap over legacy eMMC standards. If you're designing hardware around this standard, understanding the 153-ball BGA package

and its critical signal pins is essential for ensuring data integrity and power efficiency. Core Architecture: Less Pins, More Speed Unlike the parallel interface of eMMC, UFS 3.1 utilizes a serial LVDS interface

. This design choice significantly reduces the number of signal pins, which simplifies PCB routing and minimizes electromagnetic interference (EMI). Critical Signal Groups in UFS 3.1

While a standard UFS 3.1 chip uses a 153-ball BGA layout, the actual "magic" happens across a few high-speed differential pairs. Data Lanes (DIN/DOUT): UFS 3.1 supports up to two differential lanes for both transmit (TX) and receive (RX). TX_L0+, TX_L0- TX_L1+, TX_L1- : Differential transmit pairs. RX_L0+, RX_L0- RX_L1+, RX_L1- : Differential receive pairs. Reference Clock (REF_CLK):

A critical signal that must be present before requesting power mode changes into Fast_Mode. Hardware Reset (RST_N): Used to reset the UFS device to its initial state. Power Rail Requirements

UFS 3.1 is engineered for extreme power efficiency, often requiring up to 83% less power during active use than traditional SSDs. 153-Ball Automotive UFS Memory - Mouser Electronics