Ufs 3.1 Pinout

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.

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

UFS 3.1 Pinout: A Comprehensive Overview

UFS 3.1 (Universal Flash Storage) is a high-speed storage interface standard designed for mobile devices, laptops, and other applications. It offers significantly faster data transfer rates, lower power consumption, and improved performance compared to its predecessors. Understanding the UFS 3.1 pinout is essential for device manufacturers, engineers, and developers working with this technology.

UFS 3.1 Interface Overview

The UFS 3.1 interface consists of 25 pins, divided into two rows of 12 pins each and one pin in the middle. The interface is designed to be compact, with a small footprint that makes it suitable for mobile devices.

UFS 3.1 Pinout

Here is the UFS 3.1 pinout:

Row 1 (12 pins)

Row 2 (12 pins)

Middle Pin

Key Features and Functions

Conclusion

The UFS 3.1 pinout is designed to provide high-speed data transfer, low power consumption, and improved performance. Understanding the pinout is crucial for designing and developing devices that utilize UFS 3.1 storage. This overview provides a comprehensive look at the UFS 3.1 interface, its features, and functions, helping engineers, developers, and manufacturers work with this technology.

| Mistake | Consequence | |---------|-------------| | Swapping D0_RX with D0_TX | Link training fails – no communication | | Using 50Ω impedance instead of 85Ω | Signal integrity failure at Gear 3/4 | | Leaving VCCQ2 floating when needed | Unexpected device reset or I/O errors | | Forgetting AC coupling caps on TX lines | DC offset causes PHY damage | | Driving REF_CLK > 1.8V | Permanently damage input buffer |

UFS 3.1 can dissipate 1.5W – 2.5W during sustained writes. The central ground balls (VSS) serve as the primary thermal path. Connect these to a thermal pad and use 9+ thermal vias down to a ground plane on layer 2.

UFS does not expose JTAG on standard pins. Debug requires:

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.

Subject: [Request] UFS 3.1 Standard Pinout Schematic

Body: Hi everyone,

I'm currently working on a trace repair for a mainboard with a UFS 3.1 storage chip. The pads are damaged, and I'm having trouble identifying the specific TX/RX differential pairs under the microscope.

Does anyone have a generic BGA-153 pinout diagram for UFS 3.1 they could share? Specifically looking to confirm the location of the REF_CLK and Ground pads to map the rest of the circuit.

Image of the damaged area attached below. 👇

Thanks in advance!

#MobileRepair #Schematics #UFS #HelpNeeded

Universal Flash Storage (UFS) 3.1: Technical Architecture and Pinout Analysis ufs 3.1 pinout

Universal Flash Storage (UFS) 3.1 is an advanced storage standard developed by the JEDEC Solid State Technology Association to meet the high-bandwidth and low-latency demands of 5G smartphones, automotive systems, and IoT devices. By utilizing the MIPI M-PHY physical layer and UniPro link layer, UFS 3.1 achieves sequential read speeds of approximately 2100 MB/s, representing a significant performance leap over older standards like eMMC. 1. Physical Interface: The BGA153 Footprint

The standard physical package for UFS 3.1 is the 153-ball Fine-pitch Ball Grid Array (FBGA). While this 153-ball footprint is physically similar to the older eMMC BGA153, the internal pin assignments and electrical signaling are entirely different and incompatible. Samsung 512GB UFS 3.1 - Upgrade Guide & Performance 2026

UFS 3.1 typically utilizes a BGA 153 (153-ball) package with an 11.5mm x 13.0mm footprint. Unlike the parallel interface of eMMC, UFS uses a serial differential interface (MIPI M-PHY) to achieve significantly higher speeds—over 1,500 MB/s for UFS 3.1. ⚡ Critical Signal Groups

The UFS 3.1 interface is categorized into power, high-speed differential data, and control lines. Signal Type Description Data (Transmit) TXP, TXN Differential transmit pair (Host to Device) Data (Receive) RXP, RXN Differential receive pair (Device to Host) Control RST_N, REF_CLK

Reset signal and Reference Clock for high-speed synchronization Power (Core) VCC Primary supply voltage (typically 2.5V – 3.3V) Power (I/O) VCCQ, VCCQ2

I/O supply voltages (typically 1.2V for VCCQ and 1.8V for VCCQ2) 🔍 ISP (In-System Programming) Pinout

For data recovery or forensic chip-off/ISP work, five primary wires are usually required to establish communication with tools like EasyJtag or UFI: TXP / TXN: Data transmission pairs. RXP / RXN: Data reception pairs. GND: Ground connection.

RST: Reset (often required for stable detection on newer chips).

Note: For ISP, power is often supplied via the device's USB port (battery connected) rather than external VCC wires to avoid current supply issues. UFS | eStorage | Samsung Semiconductor Global

Its expanded capacity and enhanced endurance support diverse automotive workloads. * Interface. G4 2Lane. * Package Size. 11.5x13. samsung.com UNIVERSAL FLASH STORAGE (UFS 3.1) - Mouser Electronics

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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(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

You're looking for information on the pinout of UFS 3.1!

UFS 3.1 (Universal Flash Storage 3.1) is a high-speed storage interface standard designed for mobile devices, such as smartphones, tablets, and laptops. It provides faster data transfer rates, lower power consumption, and higher storage capacity compared to its predecessors.

The UFS 3.1 interface uses a MIPI (Mobile Industry Processor Interface) M-PHY physical layer, which is a high-speed, low-power interface standard. The UFS 3.1 pinout consists of:

UFS 3.1 Pinout:

The UFS 3.1 interface supports multiple lanes, with each lane capable of operating at speeds of up to 2.9 Gbps (gigabits per second). The standard also supports multiple configurations, including:

The UFS 3.1 pinout is designed to be compatible with a wide range of applications, including smartphones, tablets, laptops, and other mobile devices.

Do you have any specific questions about the UFS 3.1 pinout or its applications?

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

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) | Pin(s) | Symbol | Description | Importance

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)

* 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 —

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 (UFS) 3.1 is the high-performance storage standard designed for the 5G era, offering significant speed and power efficiency improvements over previous generations. Understanding its pinout is critical for hardware engineers and developers tasked with integrating this storage into mobile, automotive, and AR/VR systems. The Core Architecture: Low Pin Count, High Speed

Unlike the parallel interface used in older eMMC standards, UFS 3.1 utilizes a serial interface based on the MIPI M-PHY and UniPro specifications. This design choice allows for a significantly lower pin count, which simplifies PCB routing and reduces the physical footprint on space-constrained mobile motherboards.

The physical interface typically resides in a 153-ball BGA (Ball Grid Array) package, which is standard for high-density flash storage. Key Functional Pin Categories

The UFS 3.1 pinout is strategically organized into three primary functional groups: data transmission, power supply, and control/clocking. High-Speed Data Lanes (M-PHY):

TX_DP/TX_DN: Differential transmit pairs for data sent from the host to the UFS device.

RX_DP/RX_DN: Differential receive pairs for data sent from the device to the host.

UFS 3.1 supports dual-lane operation, meaning it can utilize two sets of these differential pairs to double its bandwidth, reaching sequential read speeds up to 2,100 MB/s. Power Supply Pins:

VCC: The main power supply for the NAND flash memory, typically operating at 2.5V or 3.3V.

VCCQ: The power supply for the UFS controller and I/O interface, usually 1.2V.

VCCQ2: An additional supply used in some configurations for low-voltage interface operations. Reference Clock and Control:

REF_CLK: A square wave single-ended reference clock input. While UFS can operate without this in low-speed modes (using self-clocked PWM signaling), the reference clock is required for High-Speed (HS) modes to ensure low bit-error rates and fast PLL locking. RST_N: A hardware reset pin used to initialize the device. Hardware Integration and Signal Integrity

UFS 3.1 | Universal Flash Storage | Samsung Semiconductor Global

UFS 3.1 (Universal Flash Storage) is a high-speed, serial interface designed for mobile systems like smartphones and tablets. Unlike older parallel interfaces like eMMC, the UFS 3.1 pinout utilizes Low Voltage Differential Signaling (LVDS) to achieve high-performance full-duplex operation, allowing the device to read and write simultaneously. UFS 3.1 Pin Configuration Overview

The most common physical package for UFS 3.1 is the 153-ball FBGA (Fine-pitch Ball Grid Array), measuring approximately 11.5mm x 13.0mm. The reduced pin count compared to eMMC simplifies PCB routing while enabling much higher bandwidth.

According to technical specifications from Arasan Chip Systems and Kingston , the pinout is categorized into high-speed data lanes, power supply lines, and control signals. High-Speed Differential Lanes (M-PHY)

UFS 3.1 relies on the MIPI M-PHY physical layer, which uses differential pairs for data transmission.

TX_P / TX_N (Transmit): Differential data lanes for sending information from the host to the storage device.

RX_P / RX_N (Receive): Differential data lanes for receiving data from the storage device to the host.

Lanes: UFS 3.1 typically supports a 2-lane configuration (2 TX and 2 RX pairs), doubling the bandwidth compared to single-lane setups. Power Supply Pins

Maintaining stable power is critical for UFS 3.1 performance, especially with features like "Write Booster".

VCC: The main power supply for the NAND flash memory, typically ranging from 2.4V to 2.7V.

VCCQ: Power supply for the controller and I/O interface, typically 1.14V to 1.26V (nominal 1.2V).

GND / VSS: Ground pins used for power return and signal shielding. Clock and Control Signals

REF_CLK (Reference Clock): Provides the base frequency for the M-PHY. Modern UFS 3.1 devices like those from Samsung Semiconductor require a precise reference clock to transition into high-speed modes. Row 2 (12 pins)

RST_N (Hardware Reset): A low-active signal used to hard-reset the UFS device. UFS 3.1 vs. eMMC Pinout

UFS 3.1 | Universal Flash Storage | Samsung Semiconductor Global

Bolstered by JEDEC standards, the UFS 3.1 offers high-performing storage with serious speed. It's thanks in part to Write Booster, samsung.com Samsung UFS Card

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

The UFS 3.1 pinout refers to the physical electrical interface of the Universal Flash Storage (UFS) version 3.1 standard, primarily used in high-end smartphones and automotive systems to achieve ultra-fast data transfer speeds.

Unlike older parallel standards like eMMC, UFS 3.1 uses a serial differential interface that significantly reduces the number of required signal pins while boosting performance. UFS 3.1 Pin Configuration (153-Ball FBGA)

Most UFS 3.1 devices are packaged in a 153-ball FBGA (Fine-pitch Ball Grid Array), typically measuring 11mm x 13mm. While the physical grid has 153 positions, only a fraction are active signals; many are reserved for power, ground, or future expansion. The core signals can be categorized into three main groups: 1. High-Speed Serial Data Lanes (MIPI M-PHY)

These pins handle the actual data transfer using the MIPI M-PHY physical layer. UFS 3.1 typically supports up to two lanes in each direction (full-duplex).

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

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.

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