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Understanding UFS 3.1 Pinout: A Technical Guide to Next-Gen Storage Architecture

Demystifying the UFS 3.1 Pinout: A Guide for Hardware Engineers

Enables simultaneous reading and writing, boosting overall system performance. Compact Design: The 153-ball BGA package (

I/O signaling power supply. Usually set to 1.8V to maintain compatibility with legacy control line logic levels. 4. Ground (VSS)

A low-active signal used to hard-reset the UFS device. UFS 3.1 vs. eMMC Pinout ufs 3.1 pinout

For hardware engineers, data recovery specialists, and mobile forensics experts, understanding the is critical for diagnostics, device programming, and chip-off data extraction. 1. What is UFS 3.1?

For hardware designers, mastering the principles behind the UFS 3.1 pinout—understanding the distinct roles of VCC and VCCQ, the correct way to route differential pairs, and the importance of a clean reference clock—is the first step toward building reliable, high-performance systems. For technicians and engineers, this knowledge transforms a complex chip-on-board into an accessible interface for debugging and recovery. As UFS technology evolves to versions 4.0 and beyond, the foundational hardware principles established in version 3.1 will remain the bedrock of integrated embedded storage for years to come.

UFS utilizes MIPI M-PHY physical layer technology. Data is transmitted via differential pairs (Positive and Negative signals) to minimize electromagnetic interference (EMI) and maintain signal integrity at gigabit speeds. UFS 3.1 supports up to two downstream (Rx) lanes and two upstream (Tx) lanes.

Depending on the specific implementation, some balls may be used for: Understanding UFS 3

| Ball | Signal | Type | Description | |------|--------|------|-------------| | A1 | VCC | Power | NAND flash core power (2.5V - 3.6V, typically 3.3V) | | A2 | VCC | Power | Same as A1 – connect together | | A4 | REF_CLK | Input | Reference clock (26 MHz typical, 19.2 / 38.4 MHz possible) | | A5 | RST_N | Input | Hardware reset (active low, internal pull-up) | | B1 | VCC | Power | NAND core power | | B2 | VCC | Power | NAND core power | | B3 | C/D | Input | Configuration / Boot mode. Pull high (VCCQ) for normal boot, low for test modes. | | B4 | VSS | Ground | Ground | | B5 | VSS | Ground | Ground | | C1 | VCCQ | Power | Controller I/O & logic (1.14V - 1.26V typical 1.2V) | | C2 | VCCQ | Power | Same as C1 | | C3 | D0_RX | Input | Lane 0 – Receiver differential input (from host) | | C4 | D0_TX | Output | Lane 0 – Transmitter differential output (to host) | | D3 | D1_RX | Input | Lane 1 – Receiver differential input | | D4 | D1_TX | Output | Lane 1 – Transmitter differential output | | D5 | VSS | Ground | Ground | | E1 | VCCQ2 | Power | Optional second I/O supply (1.8V or 2.5V). If unused, tie to VCCQ or leave NC. | | ... (center balls omitted) | ... | ... | Most balls in rows E–J / cols 3–10 are reserved or not connected | | L2 | VSS | Ground | Ground | | M1 | VSS | Ground | Ground |

The UFS 3.1 pinout brings several benefits to mobile devices, including:

Ground pins used for power return and signal shielding. Clock and Control Signals

Request: “BGA 153 ball map” + “UFS 3.1 pin assignment” from vendor’s NDA documentation. Depending on the specific implementation

UFS isolates interface power into VCCQ2 to keep high-frequency communication noise separate from the delicate internal logic core ( VCCQ ). Conclusion

For hardware designers implementing UFS 3.1 storage on custom single-board computers or IoT devices:

The TX and RX differential pairs must be routed with a strict differential impedance matching requirement (typically 100 Ohms ).